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electrical:solar:sizing [2022/01/26 19:48] princess_fluffypants [Voltage] |
electrical:solar:sizing [2023/08/31 19:54] (current) princess_fluffypants [Voltage] |
==== calculators ==== | ==== calculators ==== |
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| * Unbound Solar [[https://unboundsolar.com/solar-information/offgrid-calculator|offgrid calculator]] |
| * AltE [[https://www.altestore.com/store/calculators/off_grid_calculator/|offgrid calculator]] |
* [[https://www.batterystuff.com/kb/tools/calculator-sizing-a-battery-to-a-load.html|BatteryStuff 12v load calculator]] | * [[https://www.batterystuff.com/kb/tools/calculator-sizing-a-battery-to-a-load.html|BatteryStuff 12v load calculator]] |
* [[http://gpelectric.com/tools/GoPowerCalculator.htm?state=RvDiv|GoPower calculator]] | * [[http://gpelectric.com/tools/GoPowerCalculator.htm?state=RvDiv|GoPower calculator]] |
* Inversion from 24vdc to 110vac is more efficient than inversion from 12vdc. | * Inversion from 24vdc to 110vac is more efficient than inversion from 12vdc. |
* You have large, power-hungry appliances that can run natively off of 24v | * You have large, power-hungry appliances that can run natively off of 24v |
* Some [[food:refrigeration|DC refrigerators]] can run off of both 12v or 24v, and are slightly more efficient when running off of 24v | * Some [[food:refrigeration|DC refrigerators]] and induction cooktops can run off of both 12v or 24v, and are slightly more efficient when running off of 24v. |
| * [[hvac:solar_ac|Off-grid Air Conditioning]] can be slightly more efficient with 24v native systems, and will allow smaller wires to be used. |
* You have a lot of long, large cable runs | * You have a lot of long, large cable runs |
* 24v doesn't have as much voltage drop as 12v over a similar distance, and can use smaller/cheaper cables. | * 24v doesn't have as much voltage drop as 12v over a similar distance, and can use smaller/cheaper cables. |
===== solar panel array ===== | ===== solar panel array ===== |
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Pick a solar panel array output on battery bank capacity. A common **rule of thumb for matching panels to battery bank** is that there should be **at least** 1 panel watt per amp-hour of nominal bank capacity. | Pick a solar panel array output on daily power requirements and battery bank capacity. A common **rule of thumb for matching panels to battery bank** is that //at a minimum// there should be 1 panel watt per amp-hour of nominal bank capacity. |
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> "...the person draining their batteries to the 50% range regularly would do much better with a 2 watts to 1Ah ratio, or even 3 to 1." -- SternWake((http://www.cheaprvliving.com/forums/Thread-How-much-solar-do-I-need?pid=278438#pid278438)) | > "...the person draining their batteries to the 50% range regularly would do much better with a 2 watts to 1Ah ratio, or even 3 to 1." -- SternWake((http://www.cheaprvliving.com/forums/Thread-How-much-solar-do-I-need?pid=278438#pid278438)) |