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electrical:12v:lvd [2018/06/23 16:49]
frater_secessus [common LVD setpoints] |
electrical:12v:lvd [2019/10/01 13:02]
frater_secessus [common LVD setpoints] |
| ===== common LVD setpoints ===== | ===== common LVD setpoints ===== |
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| Lead-acid deep cycle batteries last the longest with best capacity if they are never cycled more than 50% [[electrical:depth_of_discharge|Depth of Discharge]]((and fully charged afterwards)). That point is somewhere around 12.20v when rested or very lightly loaded. | Lead-acid deep cycle batteries are typically discharged 50% [[electrical:depth_of_discharge|Depth of Discharge]] or less ((and fully charged afterwards)). That point is somewhere around 12.20v when rested or very lightly loaded. |
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| This following chart((http://www.trojanbattery.com/pdf/GEL_Trojan_ProductLineSheet.pdf)) shows DoD vs expected duty cycles. In an offgrid scenario we will assume the bank is cycled every night. If the bank is drained to the usual 50% DoD the bank((under lab conditions)) is predicted to last 1000 cycles, or about 3 years. If the bank cycle is shallower to 20% DoD the bank is expected to last 2500 cycles, or about 7.5 years. If the bank is deeply cycled to 80% DoD the bank is expected to last 500 cycles, or about 1.5 years. | This following chart((http://www.trojanbattery.com/pdf/GEL_Trojan_ProductLineSheet.pdf)) shows DoD vs expected duty cycles. In an offgrid scenario we will assume the bank is cycled every night. If the bank is drained to the usual 50% DoD the bank((under lab conditions)) is predicted to last 1000 cycles, or about 3 years. If the bank cycle is shallower to 20% DoD the bank is expected to last 2500 cycles, or about 7.5 years. If the bank is deeply cycled to 80% DoD the bank is expected to last 500 cycles, or about 1.5 years. |
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| [[electrical:12v:lifepo4_batteries_thread|LiFePO4]] nominal 12v banks can be safely drained to 80-90% Depth of Discharge. That point is something like 12.0v.((http://rvwiki.mousetrap.net/doku.php?id=electrical:12v:lifepo4_batteries_thread#notable_voltage_reference_points)) | [electrical:12v:deep_cycle_battery#lithium_chemistries[electrical:12v:lifepo4_batteries_thread|LiFePO4]] nominal 12v banks can be safely drained to 80-90% Depth of Discharge. That point is something like 12.0v.((http://rvwiki.mousetrap.net/doku.php?id=electrical:12v:lifepo4_batteries_thread#notable_voltage_reference_points)) |
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| ===== challenges ===== | ===== challenges ===== |
| | 30| 11.80| 10.62| 9.44| | | 30| 11.80| 10.62| 9.44| |
| | 20| 11.65| 10.49| 9.32| | | 20| 11.65| 10.49| 9.32| |
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| | Observe and adjust based on your experience with your own system. |
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