> Quick answer: The incremental manufacturing cost of adding thermal insulation to a LiFePO₄ battery compartment cannot be determined from available research [3][4][7][24]. The sources also do not quantify the extended winter-runtime benefit for Romanian consumers, making it difficult to justify this cost.
While solar lamps provide renewable light in various settings, their performance can significantly degrade during cold weather. Adding thermal insulation to LiFePO₄ battery compartments is one potential solution to ensure reliable operation throughout the year, particularly in colder climates like Romania. However, determining whether this added component justifies its cost requires a detailed analysis.
Incremental Manufacturing Cost of Thermal Insulation
The incremental manufacturing cost associated with adding thermal insulation specifically for a LiFePO₄ battery compartment remains undetermined based on available research [3][4][7][24]. While the literature highlights the importance of effective thermal management in battery systems, this typically pertains to active cooling methods rather than passive insulation. Therefore, without specific data on the cost-effectiveness of such insulation, it is challenging to quantify its financial impact.
Impact of Thermal Management on Battery Performance
Effective thermal management is crucial for maintaining optimal performance and longevity of LiFePO₄ batteries [24]. However, the provided sources do not specify how passive thermal insulation affects battery runtime in cold climates like Romania. While one study notes that LiFePO₄ batteries have a lower self-discharge rate compared to nickel-based alternatives [6], this does not directly address their performance in low temperatures.
Battery Degradation Factors
Battery degradation is influenced by several factors, including ambient temperature, state of charge, and depth of discharge [17]. Cold environments can accelerate battery degradation, but the sources do not specify whether insulation would mitigate these effects. Consequently, determining if insulation improves long-term cost-effectiveness remains speculative.
Cost Structure of LiFePO₄ Batteries
LiFePO₄ batteries are noted for their safety and lack of toxic heavy metals [6][10]. They offer a lower self-discharge rate, reducing the need for constant charging and lowering operational energy demands. However, battery cost is influenced by material prices and production scale, with significant cost reductions seen at higher volumes [3][4].
Material Cost Impact
Increased material costs can significantly affect overall manufacturing expenses. For instance, PV module costs rose 50% from 2020 to 2021 due to surges in raw material prices such as polysilicon and silver [5]. Although insulation does not have a direct cost breakdown provided, these general trends suggest that any added component would contribute to overall product pricing.
Energy Savings through Insulation
Insulation can lead to substantial energy savings in buildings—up to 30% across climate zones [19]. While this data pertains to building envelopes and not battery compartments, it underscores the potential for significant efficiency gains. However, extrapolating these benefits directly to solar lamp batteries is unsupported by existing research.
Cost-Benefit Analysis
A thorough cost-benefit analysis would help determine if the added expense of insulation justifies its runtime extension in winter conditions [17]. Battery degradation alone can incur substantial costs; one study found that UK homeowners face £400 in battery degradation costs within a year [17]. While this example targets grid-connected systems, it highlights the potential long-term savings from measures like insulation.
Comparison Table: Insulated vs. Uninsulated Batteries
| Feature | Insulated Battery | Uninsulated Battery |
|–––|––––––-|–––––––|
| Winter Runtime | Potentially Extended | Standard Performance |
| Degradation | Possibly Reduced | Higher |
| Manufacturing Cost | Increased | Lower |
Key Takeaways
- The incremental cost of adding thermal insulation to LiFePO₄ battery compartments in solar lamps is not quantified by existing research.
- There is no data on how insulation affects runtime or degradation specifically for Romanian winters.
- Without specific cost and benefit analysis, it’s challenging to justify the added expense of insulation.
References
- [3] Advances in Lithium-Ion Batteries — book
source passage
of operations depends on the fraction of the total price that is made up of materials costs and purchased items. Unit materials costs change little with scale, whereas the costs per pack for labor, capital and plant area may decline substantially with increasing production rates. In Figure 6.13, the cost of materials and purchased items is 46% of the total price for the HEV batteries at 100,000 batteries per year production, but for the PHEV20 and EV130 batteries, these costs are 58% and 70%, respectively, of the total price for that level of production. As the production level increases, the fraction of these costs in the total price increases. Thus, HEV batteries realize a greater benefit from manufacturing scale than EV batteries. FIGURE 6.13 Effect of manufacturing scale on battery price to the OEM. (For color version of this figure, the reader is referred to the online version of this book.) It should be noted that even the battery prices indicated in Figure 6.13 at the low production level of 10,000 batteries per year are lower than those of 2012 because of lower materials prices and the use of a plant designed for that level of production with no special provisions for future expansion. Thus, the reduction in battery prices going forward should be greater than that shown in Figure 6.13, considering cost reduction for materials and plant modifications from current conditions that are not taken into account by Figure 6.13. The continued increase in the scale of battery p
- [4] Research_in_lithium-ion_batteries_-_Wikipedia__684ccf67 — wikipedia
source passage
Power Sources. 340: 273–281. Bibcode:2017JPS…340..273C. doi:10.1016/j.jpowsour.2016.11.054. economies of scale have already been reached, and future cost reductions from increased production volumes are minimal. Prismatic cells, which are able to further capitalize on the cost reduction from larger formats, can offer further reductions than those possible for cylindrical cells. – "Customized Lithium ion Battery Pack Supplier". LargePower. Retrieved 5 March 2016. – Chung, H. C. (2021). "Charge and discharge profiles of repurposed LiFePO4 batteries based on the UL 1974 standard". Scientific Data. 8 (1) 165. Bibcode:2021NatSD…8..165C. doi:10.1038/s41597-021-00954-3. PMC 8253776. PMID 34215731. S2CID 235718828. – Martinez-Laserna, E.; Gandiaga, I.; Sarasketa-Zabala, E.; Badeda, J.; Stroe, D.-I.; Swierczynski, M.; Goikoetxea, A. (October 2018). "Battery second life: Hype, hope or reality? A critical review of the state of the art". Renewable and Sustainable Energy Reviews. 93: 701–718. Bibcode:2018RSERv..93..701M. doi:10.1016/j.rser.2018.04.035. S2CID 115675123. – Ahmadi, Leila; Yip, Arthur; Fowler, Michael; Young, Steven B.; Fraser, Roydon A. (June 2014). "Environmental feasibility of re-use of electric vehicle batteries". Sustainable Energy Technologies and Assessments. 6: 64–74. Bibcode:2014SETA….6…64A. doi:10.1016/j.seta.2014.01.006. – Casals, Lluc Canals; Amante García, B.; Canal, Camille (February 2019). "Second life batteries lifespan: Rest of useful life and enviro
- [5] Lean_manufacturing_lessons_to_manage_solar_supply_shortages__07b3d250 — magazine
source passage
# Lean manufacturing lessons to manage solar supply shortages, skyrocketing costs Source: Blog/Web URL: https://solarbuildermag.com/featured/lean-manufacturing-lessons-to-manage-solar-supply-shortages-skyrocketing-costs/ Author: Contributing Author Date: 2022-02-09 The pandemic and climate change-related disasters have dismantled our global supply chain and impacted every organization — no matter the industry, business model or location. In the solar sector, in addition to unreliable sourcing, we’ve also struggled with rising costs that specifically impact tracker, racking and PV manufacturing. In fact, according to analysts at the consulting firm Rystad Energy, manufacturing costs for PV modules surged 50 percent from 2020 to 2021, as the cost of polysilicon, a core PV component, saw a 300 percent cost increase. Other raw material costs for silver, copper, aluminum and glass have jumped substantially since January 2020, increasing module prices. As racking and tracker suppliers, we have experienced a similar situation as the price of steel has skyrocketed. A 5-MW tracker project would’ve averaged in the 17 cent per W range last year at this time; these projects are now ranging from 31 to 33 cents, almost entirely due to higher material costs. Clearly, a crippled global supply chain, rising materials costs, overseas shipment delays and additional associated freight costs have fused into what feels like a major catastrophe. It makes sense that solar asset owners, developers an
- [6] The_Changing_Landscape_of_Battery_Technology_-_EdisonReport__4d1d8253 — magazine
source passage
# The Changing Landscape of Battery Technology Source: Blog/Web URL: https://edisonreport.com/2023/02/07/the-changing-landscape-of-battery-technology/ Author: Industry Announcement Date: 2023-02-07 Richard Raeburn, Emergency Specialist, at Tridonic, explores the reasons why the demand for Lithium Iron Phosphate battery technology is growing, as well as the future developments that will impact the emergency lighting industry. While Nickel Metal Hydride and Nickel Cadmium batteries are still incredibly popular in emergency lighting, there is a definite shift towards Lithium Iron Phosphate (LiFePO4) technology. When compared to the legacy technologies, this newer solution offers a number of benefits. Firstly, this newer technology does not contain Cadmium – a toxic heavy metal that is classified as hazardous waste. LiFePO4 contains no heavy metals so it doesn’t have the same toxicity, making it safer to handle and easier to deal with once it comes to the end of its life. With the fact that LiFePO4 batteries can be recycled to recover the materials used in their electrodes, wiring, and casings, they are considered to have the lowest impact on the environment. In addition, LiFePO4 batteries offer a lower self-discharge rate. This means they operate with periodic top-ups, rather than the constant charge that a nickel battery needs to be able to function. This reduces the power required for charging which lowers overall power consumption. LiFePO4 batteries are hardy and robust, maki
- [7] Advances in Lithium-Ion Batteries — book
source passage
to illustrate the flow of materials through the plant and the relative floor areas for the processing steps rather than representing a realistic plant layout. The overall manufacturing rate of 100,000 battery packs per year is achieved by operating for three shifts at the equivalent of 300 days per year of fully effective production. In other words, the plant operates with 83% uptime 360 days per year. Unless stated otherwise, all battery price estimates herein assume the baseline rate of production. FIGURE 6.3 Baseline Li-ion battery manufacturing plant schematic diagram. (For color version of this figure, the reader is referred to the online version of this book.) The cost of labor, capital equipment and floor area were estimated for each step in the process for the baseline plant. The cost model accounts for different scales of manufacture and different battery designs by recalculating the costs of each manufacturing step. The general approach to cost estimation of multiplying a known cost by the ratio of processing rates raised to a power has also been applied to the capital cost of individual items of equipment [25], Eqn (6.6). (6.6) Here, C0 is the capital cost of an installed equipment item designed for the baseline processing rate, R0. The power factor, p, relates the capital investment cost and the processing rate for the manufacturing step. If the value of p were 1.0, it would imply that the cost of the equipment item, or the equipment items if there are several in
- [10] Lithium-Ion Batteries_ Science and Technologies — book
source passage
cost, as shown in Table 9.3. Furthermore, reports that support the predominance of LiFePO, for the first- generation 4-V class cathodes in regard to the chemical and thermal stability are still published in the literature.°°°’ Currently, LiFePO, rather than LiMn,O, regarded as the most likely cathode candidate for the aie -sized Li-Ion eres is electric vehicles, as shown in Table 9.4. Actually, in the BATT (batteries for the advanced transportation technology) program, started by the Department of Energy of United States in 2,000, the large-scale Li-Ion batteries using LiFePO, seem to be the main point of focus. The following features of the improved LiFePO, have drawn attention for its use as a next-generation cathode candidate: ¢ Perfectly rare metal-free ¢ Larger gravimetric [Ah/g] and volumetric [Ah/cc] capacity than those of LiMn,O F 200 S. Okada and J.-i. Yamaki Table 9.3 Typical composition conditions of LiFePO Starting materials abevcttg ee Pela eal) TEE 8 De eS ee SS Fe source Li source P source Heating condition Ref. Fe€;0/-2H0 LiOH-H,O ~~ _(NH,),HPO, 800°C, 6 hin N, 54 Fe,(PO,),-8H,O Li,PO, with 350°C, 3 h>700°C, 7 hin Ar 49 PP(3w/o) (CH,COO),Fe CH,COOLi NH,H,PO, 350°C, 5 h>700°C, 10hwith15 45 ; w/o sol-gel carbon in N, FeC,0,-2H,O Li,CO, (NH,),HPO, 320°C, 12 h>800°C, 24 h with 12 46 w/o sugar in Ar FeC,O,-2H,O Li,CO, NH,H,PO, 600-850°C with 1 atm% dopant 47 in Ar (CH,COO),Fe Li,CO, NH,H,PO, 320°C, 10 h-550°C, 24 hin N, 48 FeSO, LiOH H,PO, Hydrothermal synthesis at
- [17] UK_academic_study_questions_economic_benefit_-_Energy-StorageNews__eb36e5aa — magazine
source passage
# UK academic study questions economic benefit of home battery storage, scrutinises degradation costs Source: Blog/Web URL: https://www.energy-storage.news/uk-academic-study-questions-economic-benefit-of-home-battery-storage-scrutinises-degradation-costs/ Author: David Pratt Date: 2017-08-29 There is no economic benefit from installing energy storage with solar PV in UK homes, a new study has suggested, adding that the cost of battery degradation would cost homeowners £400 (US$518) in the first year. The study by researchers at Warwick and Birmingham universities and not-for-profit emissions and decarbonisation consultancy Cenex, was seeking to analyse the viability of residential solar systems using lithium-ion batteries for energy storage in the UK. A battery degradation model was developed based on long-term ageing data collected from more than fifty degradation experiments conducted on commercially available lithium-ion batteries. This was said to account for all established modes of degradation including calendar ageing, capacity throughput, ambient temperature, state of charge, depth of discharge and the applied current. It was then characterised by a reduction in the useable energy capacity of the battery (e.g. capacity fade) and a reduction in the ability of the battery to deliver sustained power (e.g. power fade), resulting from an increase in battery impedance. Try Premium for just $1 – Full premium access for the first month at only $1 – Converts to an annual rate
- [19] BA-1005_Building_America_Special_Research_buildingsciencecom__eed88251 — authority
source passage
even dark-colored walls with low, but Code-approved, thermal resistance. Finally, air leaks can cause local jets of cold air that compromise comfort. High levels of airtightness can solve most of these problems. Economic Aspects To conduct proper cost-benefit of life-cycle costing one needs to know, among other things, the future price of energy, the cost of interest (discount rate), the cost of materials and labor, the replacement intervals and maintenance costs for equipment and assemblies. Given this wide range of unknowns, High R enclosures can either by shown to be highly favorable (assuming 7% per annum increases in energy costs, low labor costs, and low discount rates) or very expensive (assuming no energy cost increase, high discount rates, and expensive materials and labor). In short, without an agreed upon set of assumptions of what the future will hold, it is difficult to make decisions on current investments using life-cycle cost analysis. A recent analysis by PNNL [Taylor an Lucas 2010] analyzed the savings achievable by increasing R-values in new residential construction. Energy cost savings of 30% were shown across many different climate zones. The analysis, like many similar studies, assumed current energy costs even though homes built today will likely last 75 years. Similarly, the savings are based on the first years operation, which ignores the significant cost of replacing mechanical equipment over the life of the building. Most analysis of “payback” in Bu
- [24] Advances in Lithium-Ion Batteries — book
source passage
the various battery designs is driven by the pack voltage, maximum battery current, and the need for charging from the grid. Requiring higher battery currents generally increases the cost of electronics and conductors. The additional complications arising from grid charging adds a significant additional cost to the PHEV and EV systems. These additional costs in the automatic disconnect unit have the most pronounced effect on the cost of smaller batteries, as the burden amounts to a significant fraction of the total cost. The thermal management of the battery is crucial to meeting the life and safety requirements of transportation applications. BatPaC designs the liquid- or air-based thermal management system based on correlations derived from rigorous heat and mass transfer models to maintain reasonable battery temperatures under high load conditions. Air-based thermal management requires a lower volumetric energy density design, wherein air is forced over the sides of the cells to achieve adequate heat transfer. Liquid thermal management for our assumed battery design is achieved by forcing an ethylene glycol–water solution to flow over the modules. Because of the volume penalty from air thermal management, the authors typically use liquid thermal management for PHEV and EV batteries. HEV batteries may use either, but the cost savings from using cabin air is small. Current battery designs for commercial 2012 transportation batteries show no consistent thermal management appr
of operations depends on the fraction of the total price that is made up of materials costs and purchased items. Unit materials costs change little with scale, whereas the costs per pack for labor, capital and plant area may decline substantially with increasing production rates. In Figure 6.13, the cost of materials and purchased items is 46% of the total price for the HEV batteries at 100,000 batteries per year production, but for the PHEV20 and EV130 batteries, these costs are 58% and 70%, respectively, of the total price for that level of production. As the production level increases, the fraction of these costs in the total price increases. Thus, HEV batteries realize a greater benefit from manufacturing scale than EV batteries. FIGURE 6.13 Effect of manufacturing scale on battery price to the OEM. (For color version of this figure, the reader is referred to the online version of this book.) It should be noted that even the battery prices indicated in Figure 6.13 at the low production level of 10,000 batteries per year are lower than those of 2012 because of lower materials prices and the use of a plant designed for that level of production with no special provisions for future expansion. Thus, the reduction in battery prices going forward should be greater than that shown in Figure 6.13, considering cost reduction for materials and plant modifications from current conditions that are not taken into account by Figure 6.13. The continued increase in the scale of battery p
Power Sources. 340: 273–281. Bibcode:2017JPS…340..273C. doi:10.1016/j.jpowsour.2016.11.054. economies of scale have already been reached, and future cost reductions from increased production volumes are minimal. Prismatic cells, which are able to further capitalize on the cost reduction from larger formats, can offer further reductions than those possible for cylindrical cells. – "Customized Lithium ion Battery Pack Supplier". LargePower. Retrieved 5 March 2016. – Chung, H. C. (2021). "Charge and discharge profiles of repurposed LiFePO4 batteries based on the UL 1974 standard". Scientific Data. 8 (1) 165. Bibcode:2021NatSD…8..165C. doi:10.1038/s41597-021-00954-3. PMC 8253776. PMID 34215731. S2CID 235718828. – Martinez-Laserna, E.; Gandiaga, I.; Sarasketa-Zabala, E.; Badeda, J.; Stroe, D.-I.; Swierczynski, M.; Goikoetxea, A. (October 2018). "Battery second life: Hype, hope or reality? A critical review of the state of the art". Renewable and Sustainable Energy Reviews. 93: 701–718. Bibcode:2018RSERv..93..701M. doi:10.1016/j.rser.2018.04.035. S2CID 115675123. – Ahmadi, Leila; Yip, Arthur; Fowler, Michael; Young, Steven B.; Fraser, Roydon A. (June 2014). "Environmental feasibility of re-use of electric vehicle batteries". Sustainable Energy Technologies and Assessments. 6: 64–74. Bibcode:2014SETA….6…64A. doi:10.1016/j.seta.2014.01.006. – Casals, Lluc Canals; Amante García, B.; Canal, Camille (February 2019). "Second life batteries lifespan: Rest of useful life and enviro
# Lean manufacturing lessons to manage solar supply shortages, skyrocketing costs Source: Blog/Web URL: https://solarbuildermag.com/featured/lean-manufacturing-lessons-to-manage-solar-supply-shortages-skyrocketing-costs/ Author: Contributing Author Date: 2022-02-09 The pandemic and climate change-related disasters have dismantled our global supply chain and impacted every organization — no matter the industry, business model or location. In the solar sector, in addition to unreliable sourcing, we’ve also struggled with rising costs that specifically impact tracker, racking and PV manufacturing. In fact, according to analysts at the consulting firm Rystad Energy, manufacturing costs for PV modules surged 50 percent from 2020 to 2021, as the cost of polysilicon, a core PV component, saw a 300 percent cost increase. Other raw material costs for silver, copper, aluminum and glass have jumped substantially since January 2020, increasing module prices. As racking and tracker suppliers, we have experienced a similar situation as the price of steel has skyrocketed. A 5-MW tracker project would’ve averaged in the 17 cent per W range last year at this time; these projects are now ranging from 31 to 33 cents, almost entirely due to higher material costs. Clearly, a crippled global supply chain, rising materials costs, overseas shipment delays and additional associated freight costs have fused into what feels like a major catastrophe. It makes sense that solar asset owners, developers an
# The Changing Landscape of Battery Technology Source: Blog/Web URL: https://edisonreport.com/2023/02/07/the-changing-landscape-of-battery-technology/ Author: Industry Announcement Date: 2023-02-07 Richard Raeburn, Emergency Specialist, at Tridonic, explores the reasons why the demand for Lithium Iron Phosphate battery technology is growing, as well as the future developments that will impact the emergency lighting industry. While Nickel Metal Hydride and Nickel Cadmium batteries are still incredibly popular in emergency lighting, there is a definite shift towards Lithium Iron Phosphate (LiFePO4) technology. When compared to the legacy technologies, this newer solution offers a number of benefits. Firstly, this newer technology does not contain Cadmium – a toxic heavy metal that is classified as hazardous waste. LiFePO4 contains no heavy metals so it doesn’t have the same toxicity, making it safer to handle and easier to deal with once it comes to the end of its life. With the fact that LiFePO4 batteries can be recycled to recover the materials used in their electrodes, wiring, and casings, they are considered to have the lowest impact on the environment. In addition, LiFePO4 batteries offer a lower self-discharge rate. This means they operate with periodic top-ups, rather than the constant charge that a nickel battery needs to be able to function. This reduces the power required for charging which lowers overall power consumption. LiFePO4 batteries are hardy and robust, maki
to illustrate the flow of materials through the plant and the relative floor areas for the processing steps rather than representing a realistic plant layout. The overall manufacturing rate of 100,000 battery packs per year is achieved by operating for three shifts at the equivalent of 300 days per year of fully effective production. In other words, the plant operates with 83% uptime 360 days per year. Unless stated otherwise, all battery price estimates herein assume the baseline rate of production. FIGURE 6.3 Baseline Li-ion battery manufacturing plant schematic diagram. (For color version of this figure, the reader is referred to the online version of this book.) The cost of labor, capital equipment and floor area were estimated for each step in the process for the baseline plant. The cost model accounts for different scales of manufacture and different battery designs by recalculating the costs of each manufacturing step. The general approach to cost estimation of multiplying a known cost by the ratio of processing rates raised to a power has also been applied to the capital cost of individual items of equipment [25], Eqn (6.6). (6.6) Here, C0 is the capital cost of an installed equipment item designed for the baseline processing rate, R0. The power factor, p, relates the capital investment cost and the processing rate for the manufacturing step. If the value of p were 1.0, it would imply that the cost of the equipment item, or the equipment items if there are several in
cost, as shown in Table 9.3. Furthermore, reports that support the predominance of LiFePO, for the first- generation 4-V class cathodes in regard to the chemical and thermal stability are still published in the literature.°°°’ Currently, LiFePO, rather than LiMn,O, regarded as the most likely cathode candidate for the aie -sized Li-Ion eres is electric vehicles, as shown in Table 9.4. Actually, in the BATT (batteries for the advanced transportation technology) program, started by the Department of Energy of United States in 2,000, the large-scale Li-Ion batteries using LiFePO, seem to be the main point of focus. The following features of the improved LiFePO, have drawn attention for its use as a next-generation cathode candidate: ¢ Perfectly rare metal-free ¢ Larger gravimetric [Ah/g] and volumetric [Ah/cc] capacity than those of LiMn,O F 200 S. Okada and J.-i. Yamaki Table 9.3 Typical composition conditions of LiFePO Starting materials abevcttg ee Pela eal) TEE 8 De eS ee SS Fe source Li source P source Heating condition Ref. Fe€;0/-2H0 LiOH-H,O ~~ _(NH,),HPO, 800°C, 6 hin N, 54 Fe,(PO,),-8H,O Li,PO, with 350°C, 3 h>700°C, 7 hin Ar 49 PP(3w/o) (CH,COO),Fe CH,COOLi NH,H,PO, 350°C, 5 h>700°C, 10hwith15 45 ; w/o sol-gel carbon in N, FeC,0,-2H,O Li,CO, (NH,),HPO, 320°C, 12 h>800°C, 24 h with 12 46 w/o sugar in Ar FeC,O,-2H,O Li,CO, NH,H,PO, 600-850°C with 1 atm% dopant 47 in Ar (CH,COO),Fe Li,CO, NH,H,PO, 320°C, 10 h-550°C, 24 hin N, 48 FeSO, LiOH H,PO, Hydrothermal synthesis at
# UK academic study questions economic benefit of home battery storage, scrutinises degradation costs Source: Blog/Web URL: https://www.energy-storage.news/uk-academic-study-questions-economic-benefit-of-home-battery-storage-scrutinises-degradation-costs/ Author: David Pratt Date: 2017-08-29 There is no economic benefit from installing energy storage with solar PV in UK homes, a new study has suggested, adding that the cost of battery degradation would cost homeowners £400 (US$518) in the first year. The study by researchers at Warwick and Birmingham universities and not-for-profit emissions and decarbonisation consultancy Cenex, was seeking to analyse the viability of residential solar systems using lithium-ion batteries for energy storage in the UK. A battery degradation model was developed based on long-term ageing data collected from more than fifty degradation experiments conducted on commercially available lithium-ion batteries. This was said to account for all established modes of degradation including calendar ageing, capacity throughput, ambient temperature, state of charge, depth of discharge and the applied current. It was then characterised by a reduction in the useable energy capacity of the battery (e.g. capacity fade) and a reduction in the ability of the battery to deliver sustained power (e.g. power fade), resulting from an increase in battery impedance. Try Premium for just $1 – Full premium access for the first month at only $1 – Converts to an annual rate
even dark-colored walls with low, but Code-approved, thermal resistance. Finally, air leaks can cause local jets of cold air that compromise comfort. High levels of airtightness can solve most of these problems. Economic Aspects To conduct proper cost-benefit of life-cycle costing one needs to know, among other things, the future price of energy, the cost of interest (discount rate), the cost of materials and labor, the replacement intervals and maintenance costs for equipment and assemblies. Given this wide range of unknowns, High R enclosures can either by shown to be highly favorable (assuming 7% per annum increases in energy costs, low labor costs, and low discount rates) or very expensive (assuming no energy cost increase, high discount rates, and expensive materials and labor). In short, without an agreed upon set of assumptions of what the future will hold, it is difficult to make decisions on current investments using life-cycle cost analysis. A recent analysis by PNNL [Taylor an Lucas 2010] analyzed the savings achievable by increasing R-values in new residential construction. Energy cost savings of 30% were shown across many different climate zones. The analysis, like many similar studies, assumed current energy costs even though homes built today will likely last 75 years. Similarly, the savings are based on the first years operation, which ignores the significant cost of replacing mechanical equipment over the life of the building. Most analysis of “payback” in Bu
the various battery designs is driven by the pack voltage, maximum battery current, and the need for charging from the grid. Requiring higher battery currents generally increases the cost of electronics and conductors. The additional complications arising from grid charging adds a significant additional cost to the PHEV and EV systems. These additional costs in the automatic disconnect unit have the most pronounced effect on the cost of smaller batteries, as the burden amounts to a significant fraction of the total cost. The thermal management of the battery is crucial to meeting the life and safety requirements of transportation applications. BatPaC designs the liquid- or air-based thermal management system based on correlations derived from rigorous heat and mass transfer models to maintain reasonable battery temperatures under high load conditions. Air-based thermal management requires a lower volumetric energy density design, wherein air is forced over the sides of the cells to achieve adequate heat transfer. Liquid thermal management for our assumed battery design is achieved by forcing an ethylene glycol–water solution to flow over the modules. Because of the volume penalty from air thermal management, the authors typically use liquid thermal management for PHEV and EV batteries. HEV batteries may use either, but the cost savings from using cabin air is small. Current battery designs for commercial 2012 transportation batteries show no consistent thermal management appr