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food:refrigeration:power [2024/05/09 17:31] frater_secessus [charging from alternator] |
food:refrigeration:power [2024/05/09 17:42] frater_secessus [battery bank capacity] |
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* compressor fridges are a part-time load; as a rule of thumb we can assume the compressor will be running 1/3rd of the time. | * compressor fridges are a part-time load; as a rule of thumb we can assume the compressor will be running 1/3rd of the time. | ||
- | * but they will consume Wh (Watt-hours) over a 24-hour period | + | * they will consume |
- | * you must make power to recharge the bank | + | * you must have at least enough charging capacity |
* and have enough bank to make it through periods where charging is absent | * and have enough bank to make it through periods where charging is absent | ||
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===== battery bank capacity ===== | ===== battery bank capacity ===== | ||
- | The battery bank capacity is dependent on a few factors: | + | The battery bank capacity |
* how deeply the chemistry can be discharged (~50% for lead, ~80% for LiFePO4) | * how deeply the chemistry can be discharged (~50% for lead, ~80% for LiFePO4) | ||
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The simplest case will be charging LFP from [[electrical: | The simplest case will be charging LFP from [[electrical: | ||
- | Charging LFP [[electrical: | + | Charging LFP [[electrical: |
Assuming there is enough time (usually 5-6 hours) a lead bank can be charged by DC-DC alone. | Assuming there is enough time (usually 5-6 hours) a lead bank can be charged by DC-DC alone. | ||
- | Note that some forms of alternator charging make [[electrical: | + | |
==== charging from the ciggy port ==== | ==== charging from the ciggy port ==== | ||
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==== charging from solar ==== | ==== charging from solar ==== | ||
- | Charging from [[electrical: | + | Charging from [[electrical: |
- | You will need to [[electrical: | + | You will need to [[electrical: |
December in Belle Fourche has only 1.52 hours of FSE. It would take ~375w of panel((flat-mounted, | December in Belle Fourche has only 1.52 hours of FSE. It would take ~375w of panel((flat-mounted, | ||
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Average 1378 | Average 1378 | ||
+ | table based on the PVwatts link above | ||
==== charging from multiple sources ==== | ==== charging from multiple sources ==== | ||