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electrical:12v:lvd [2018/06/23 16:37] frater_secessus [common LVD setpoints] |
electrical:12v:lvd [2018/06/23 16:44] frater_secessus |
===== 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. | 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. Voltage //sags// under heavy load: |
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| | **State of Charge**| **Voltage, light or no load((1.0 per Trojan))**| **moderate load((interpolated))**| **heavy load((per Trojan))**| |
| | 100| 12.70| 11.43| 10.16| |
| | 90| 12.60| 11.34| 10.08| |
| | 80| 12.40| 11.16| 9.92| |
| | 70| 12.30| 11.07| 9.84| |
| | 60| 12.20| 10.98| 9.76| |
| | 50| 12.10| 10.89| 9.68| |
| | 40| 12.00| 10.80| 9.60| |
| | 30| 11.80| 10.62| 9.44| |
| | 20| 11.65| 10.49| 9.32| |
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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. |