electrical:12v:dailypowerrequirements
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electrical:12v:dailypowerrequirements [2023/09/29 10:19] frater_secessus [add them all up] |
electrical:12v:dailypowerrequirements [2023/09/29 10:20] frater_secessus [and note your highest-current loads] |
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Aside: if you haven't made or used a spreadsheet before, here is [[https://www.youtube.com/watch?v=7Q2C9MB-YH4|a beginner's intro]] on youtube. Many computers come with a spreadsheet program (like Excel) and there are free ones like [[https://www.libreoffice.org/discover/calc/|LibreOffice Calc]] and free online ones like [[https://docs.google.com/spreadsheets/u/0/|Google Sheets]], etc. Google Sheets was used for the screenshots in this article. | Aside: if you haven't made or used a spreadsheet before, here is [[https://www.youtube.com/watch?v=7Q2C9MB-YH4|a beginner's intro]] on youtube. Many computers come with a spreadsheet program (like Excel) and there are free ones like [[https://www.libreoffice.org/discover/calc/|LibreOffice Calc]] and free online ones like [[https://docs.google.com/spreadsheets/u/0/|Google Sheets]], etc. Google Sheets was used for the screenshots in this article. |
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==== and note your highest-current loads ==== | |
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Sometimes a load doesn't use much energy (Wh) because runtimes are short, but still consumes a lot of power (W). An example might be an electric coffeemaker. | |
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It might run for only 5 minutes a day (1200w / 60 minutes in an hour * 5 minutes) = **100Wh**. But during that run it is pulling ~118A (1200w / 0.85 inverter losses / 12v). **So the entire system (batteries, wiring, inverter) has to be sized to that 118A load** thar runs only 5 minutes a day. Do you love that Keurig enough to buy extra batteries, fatter wire, and a bigger inverter to run it? | |
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electrical/12v/dailypowerrequirements.txt ยท Last modified: 2024/02/08 11:22 by frater_secessus