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Looking for a programmable DC load with a Wh cutoff
MarkL:
I think your choices of load are going to be very constrained with the watt-hour cutoff requirement.
Consider having an external computer monitor the discharge. It could read the wattage being discharged, integrate over time, and then turn off the load when the value is reached. You would probably want to keep any low-voltage cutoff set in the load in case the computer went out to lunch.
If the load does not report watts, I'm sure it would happily give you the voltage and current so the computer could calculate it, and then integrate.
Kean:
As mentioned, due to the pretty flat discharge curve monitoring voltage isn't much help with LFP cells except to avoid over discharge.
If you want some reasonable accuracy in SoC, then you'll need to do a cycle - i.e fully charge the battery, run a full discharge to measure capacity in Ah or Wh, and finally recharge while measuring SoC based on the discharge test to determine the desired cutoff point.
Unless you have wide tolerance in the cell quality, I expect that measuring Ah will be sufficient and give pretty close estimates of the Wh.
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