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opinion:solar:sizing [2023/10/22 11:08] frater_secessus [solar panels] |
opinion:solar:sizing [2023/12/26 11:57] frater_secessus [battery bank] |
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You will **need somewhat more Ah capacity** | You will **need somewhat more Ah capacity** | ||
- | * if you have undersized solar | + | * if you have undersized solar (lithium banks only) |
- | * you have lead-chemistry battery bank | + | * you have lead-chemistry battery bank (50% usable capacity rather than 80% usable) |
+ | * if charging is time-limited and you want maximal harvest from the alternator, shore, or other high-current charging source. | ||
You will need **somewhat less Ah capacity** | You will need **somewhat less Ah capacity** | ||
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* if you run loads in the daytime instead of at night | * if you run loads in the daytime instead of at night | ||
* if you have [[electrical: | * if you have [[electrical: | ||
+ | * if you drive often and have [[electrical: | ||
* you have lithium-chemistry battery bank((can be ~0.62% the size of the lead bank, due to deeper [[electrical: | * you have lithium-chemistry battery bank((can be ~0.62% the size of the lead bank, due to deeper [[electrical: | ||
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You will **need somewhat more solar** | You will **need somewhat more solar** | ||
- | * if you live in an area with relatively little sun, like the American Northwest. | + | * if you live in an area with relatively little sun, like the American Northwest, Northern Europe, etc. |
* if you want to run more [[electrical: | * if you want to run more [[electrical: | ||
* if you live offgrid full time (FT) or spend long periods [[camping: | * if you live offgrid full time (FT) or spend long periods [[camping: | ||
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* overall efficiency of the solar setup (we can ballpark 85% for MPPT setups, 70% for PWM) | * overall efficiency of the solar setup (we can ballpark 85% for MPPT setups, 70% for PWM) | ||
* [[electrical: | * [[electrical: | ||
- | * minimum charging current requirements, | + | |
+ | | ||
Let's assume a 200Ah AGM bank depleted to 50% SoC, wintering in [[camping: | Let's assume a 200Ah AGM bank depleted to 50% SoC, wintering in [[camping: | ||
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- So we need **590W of panel** (1568.63Wh / 3.08 hours) | - So we need **590W of panel** (1568.63Wh / 3.08 hours) | ||
- | You may find it easier in the long-term to model this kind of thing in a spreadsheet. | + | In practice you probably won't be drawing your bank to the lowest allowed level each day; substitute your [[electrical: |
+ | **Note**: | ||
==== solar charge controller ==== | ==== solar charge controller ==== | ||