4 cycles and the results:
- fresh install, SoH = ---
- first cycle done according to manual, then SoH = 100%
- second cycle, not as deep and a little erratic load, then SoH = 90%
- third cycle, deep, and steady load, then SoH = 90%
- fourth cycle down to !65%, then SoH = 90%
- The last two cycles, while in the discharge part of the test, the SG200 showed SoC readings that I'm guessing are driven by coulomb counting. When I turned off all loads, it seems the SG200 then switchs to a SoC reading that is driven by voltage. After I turned off all loads for the last two tests, the SoC dropped SIGNIFICANTLY. Third test was stopped at maybe 40%, and after the loads were removed, and after some handful of minutes, the SoC reading went down to ~10%. For the fourth test, I stopped at ~65%, and then when the loads were removed, the SoC reading dropped to 30%-40%. This makes me feel like the the batteries are perhaps in pretty bad shape, and the SoH reading has not yet converged on the real state of the batteries.
- Even though it is reporting 90% SoH, during the discharge part of the tests, the calculations based on the current draw, and the reported "Time To Go" (TTG(h) * current draw ) / <design capacity of bank>, suggest that the SoH should be ~80%.