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Bob wrote a very good article last July that helps you get "good enough accuracy". http://www.cheaprvliving.com/blog/monitor-batteries-voltage/ I also use a down and dirty method to calculate battery SOC. I add .40 to the voltage readout to get the percentage SOC. So 12.60 + .40 would be 100%...

I had the same issue with my sunsaver 10. I contacted Morningstar tech support. After a few tests, they sent me a new one.