Just a question about checking state of charge from BMSes - any recommendations for a BMS that can expose state of charge (in % or Ah or Wh) of a 24VDC, 100Ah battery for example over a modbus register? Thanks!
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If you are referring to an FLA type battery then there really isn't any measurement except the acid level that tells you what the SOC is.
If you are talking about a Lithium chemistry battery then a BMS might be able to provide accurate SOC data. As to how that is shown, I think it is up to the owner but for me I would like to see the value in a %. -
Yes a 24V LiFePO4 battery is what I'm thinking - clearly you can measure voltage but that is not really a measure of SoC - and yes ideally a percentage would be great. I think there are devices like this one: http://www.cruzpro.com/vah110.html that use Peukert's Law to determine a percentage of capacity available, but agree it's not a simple linear relationship to time or current flow.Comment
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Originally posted by jwrgorman View PostYes a 24V LiFePO4 battery is what I'm thinking - clearly you can measure voltage but that is not really a measure of SoC - and yes ideally a percentage would be great. .....9 kW solar, 42kWh LFP storage. EV owner since 2012Comment
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