Battery Calculations Workbook
Is there a good calculator for estimating size of battery and inverter for an off-peak, non-solar system to charge battery during off-peak times and run house during peak times? I’d add solar later.
Videos
Just added a new download of an excel workbook that has a number of calculations around the subject of batteries:
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Pack Sizing – enter nominal voltage, capacity and cell internal resistance. Then play with the pack series and parallel configuration to understand maximum power capability, Joule heating and current at cell and pack terminals.
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Series and Parallel – look at variations in the pack configuration, outputing voltage ranges, total energy and estimated pack mass.
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OCV curves – exactly what it says on the sheet, average charge/discharge open circuit voltage curves for NMC, LFP and LTO.
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Parts List – a list of parts for a battery pack. For now just a list, but we will expand this to help you even more over time.
At the moment this is version 0.01 - very much a draft, but I think useful enough that I have included it as part of the yearly download pass: https://www.batterydesign.net/downloads/battery-calculations-workbook/
Pack Sizing
plus this is the Series and Parallel sheet
as you can see just be the version number, there is a lot more to come. Gradually this will grow deeper and broader.