and I tend to believe the Monitor's method as being more accurate, though unless I charge all the way up all the time (which should be possible) then there would probably be an increasing error in its running total, so that the SCC might be more accurate. The point is that the Monitor and the SCC gave really different "% full" SOC readings during my week of testing. Instead, it sums up positive currents and subtracts negative currents, integrating as it were, keeping a running total from your initial "100%" or "0%" decision about Amp-hour capacity. In contrast, the Renogy Battery Monitor cites actual battery (/bank) voltage but unless you set the min/max voltages, it doesn't use voltage to decide about SOC. It doesn't know or care how many batteries you have it just looks at the voltage, consults a curve it has for this kind of battery, and cites the SOC. My little owner's manual booklet doesn't show this the diagram shown above would have been helpful to me.īut I'm actually writing this because there are two points I'd like to make which I hope are worth your time to read:ġ) As far as I can tell, the Renogy SCC (I have a Rover 20) measures voltage, only, per your choice of battery chemistry (sealed AGM, in my case) to determine the state of charge (SOC) of a battery or bank of batteries. In retrospect: DUH! Though I wish the Renogy's monitor manual would say this - and actually I wish its diagram would show the (crucial) little red wire heading off to the battery bank's + terminal. ![]() Now it works great, with the two little arrows showing UP when the sun is hitting the panel and down when the batteries are depleting - but this was confusing to me because if you get this wrong it will monitor the depletions correctly (show how much current is being spent, and how many Ah remain, as it did during my multi-day test) but won't show the battery increasing in charge again. In this thread it's been made clear by you kind people that nope, this has to be connected to the P- terminal. ![]() My problem was similar - I had incorrectly connected the Renogy Solar Controller (SCC's) BATT- connector to the B- terminal.
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