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opinion:frater_secessus:run_this_load [2024/04/20 22:30] frater_secessus created |
opinion:frater_secessus:run_this_load [2024/05/09 15:44] (current) frater_secessus [watt-hours] |
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- current (power), in Amps (A) | - current (power), in Amps (A) | ||
- Watt-hours (Wh) ((or Amp-Hours)) (energy) | - Watt-hours (Wh) ((or Amp-Hours)) (energy) | ||
+ | - any [[electrical: | ||
- recharging afterward | - recharging afterward | ||
+ | |||
+ | And a couple formulas we will use to convert units back and forth: | ||
+ | |||
- Watts = Volts x Amps. | - Watts = Volts x Amps. | ||
- Amps = Watts / Volts. | - Amps = Watts / Volts. | ||
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- | ==== watt-hours ==== | + | ===== watt-hours ===== |
+ | |||
+ | Energy use is often done in Watt-hours, although Amp-hours will also work. | ||
This is time (hours) x watts. | This is time (hours) x watts. | ||
+ | |||
+ | |||
+ | Battery chemistries have recommended depths of discharge. | ||
+ | |||
+ | * Lead batts are usually run down to 50%, so we would need at least 28.8Ah of lead to run our 173Wh load for one day (173Wh / 0.5 / 12.0v nominal). | ||
+ | * LiFePO4 batts are usually run down to 20%, so we would need at least 16.9Ah of LFP to run our 173Wh load for one day (173Wh / 0.8 / 12.8v nominal). | ||
+ | |||
+ | Then multiply by the "days of autonomy" | ||
+ | |||
+ | Note that running loads while sufficient charging is active is basically a freebie and does not count against the battery capacity.((it //will// slow down recharging if done during Bulk or and //may// slow down recharging in Absorption stages)) | ||