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electrical:12v:deep_cycle_battery [2018/12/12 16:46] frater_secessus [Carbon foam] |
electrical:12v:deep_cycle_battery [2018/12/28 08:47] frater_secessus [lithium chemistries] corrected li-ion discharge voltages |
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===== lithium chemistries ===== | ===== lithium chemistries ===== | ||
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+ | ==== LiFePO4 ==== | ||
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In theory **LifePO4 lithium batteries** should be near perfect for boondocking. | In theory **LifePO4 lithium batteries** should be near perfect for boondocking. | ||
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* CF [[http:// | * CF [[http:// | ||
- | Other lithium chemistries like **" | + | ==== Non-LiFePO4 lithium-ion ==== |
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+ | Non-LiFeP04 Li-ion [called " | ||
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+ | There are hobbyists who build 4S packs and undercharge the cells to only 3.7v. This gives an operating range of 14.8v - 12v, a much better fit for nominal 12v systems. The downside is this configuration only uses 58% of the cells' capacity and will require more cells to achieve the same amount of Ah. | ||
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+ | **Pro:** | ||
+ | * About half the cost of LFP for the same Ah capacity | ||
+ | * widely available | ||
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+ | **Con:** | ||
+ | * overcharging or physical damage can cause a runaway condition (ie fire) | ||
+ | * voltage mismatch - | ||
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+ | Other lithium chemistries like **" | ||
7S banks make a decent 24v bank. They are 29.4v fully charged and 80% discharged at 26.11v, compared to lead acid's 29.6v max voltage and 24.2v 50% DoD cutoff. | 7S banks make a decent 24v bank. They are 29.4v fully charged and 80% discharged at 26.11v, compared to lead acid's 29.6v max voltage and 24.2v 50% DoD cutoff. | ||