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opinion:frater_secessus:lifepo4_charging_voltage [2023/07/22 00:08] frater_secessus [Problems caused by lithium charging profiles] read on |
opinion:frater_secessus:lifepo4_charging_voltage [2024/02/10 11:33] (current) frater_secessus [the full process13.6v example |
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==== TLDR ==== | ==== TLDR ==== | ||
- | If this is the problem then reducing the charging voltage will cause the symptoms to improve or disappear. | + | If excessive charging voltage |
[[opinion: | [[opinion: | ||
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LiFePO4 will fully charge at voltages as low as the mid-13s, | LiFePO4 will fully charge at voltages as low as the mid-13s, | ||
- | * ≥14.0v will charge to 100% SoC with zero minutes of absorption durations: hit the voltage setpoint and //stop//. Cell voltages tend to diverge as charging voltage increases above 14.0v because they are further up the knee (see below) | + | * ≥14.0v will charge to ~100% SoC with zero minutes of absorption durations: hit the voltage setpoint and //stop//. Cell voltages tend to diverge as charging voltage increases above 14.0v because they are further up the knee (see below) |
- | * 13.8v will charge to 100% SoC with a small amount of Absorption (10-30 minutes?) and cells tend to stay in balance. | + | * 13.8v will charge to ~100% SoC with a small amount of Absorption (10-30 minutes?) and cells tend to stay in balance. |
- | * 13.6v will charge to 100% SoC with several hours of Absorption | + | * 13.6v will charge to ~100% SoC with several hours of Absorption |
- | * 13.4v will // | + | |
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This can be intentional behavior, caused by a Li profile that | This can be intentional behavior, caused by a Li profile that | ||
- | * charges to a high voltage (see above) | + | - charges to a high voltage (see above) |
- | * then allows the battery to discharge until it hits the [[electrical: | + | |
- | * at which point it charges to the high voltage again | + | |
+ | - rinse and repeat until the sun goes down | ||
During the discharge stage the controller will appear to stop working. | During the discharge stage the controller will appear to stop working. |