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opinion:frater_secessus:lifepo4_charging_voltage
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| Both sides previous revision Previous revision Next revision | Previous revision | ||
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opinion:frater_secessus:lifepo4_charging_voltage [2023/07/21 23:18] frater_secessus |
opinion:frater_secessus:lifepo4_charging_voltage [2024/02/10 11:33] (current) frater_secessus [the full process13.6v example |
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| ====== Problems caused by lithium charging profiles ====== | ====== Problems caused by lithium charging profiles ====== | ||
| + | You'd think that a " | ||
| ===== excessive charging voltage ===== | ===== excessive charging voltage ===== | ||
| Line 19: | Line 19: | ||
| ==== 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: | ||
| Line 36: | Line 36: | ||
| 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 // | + | |
| Line 67: | Line 66: | ||
| 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. | ||
opinion/frater_secessus/lifepo4_charging_voltage.1689995919.txt.gz · Last modified: 2023/07/21 23:18 by frater_secessus
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