This 40A solar charge controller works very well with the AGM batteries in my RV. I run it with 4 solar panels and love the automatic polarity reversal, reverse polarity and other health checks this thing does. I've had trouble with some cheap controllers and how easy it is to reverse polarity with SAE connectors. This solved that problem for me and added a lot of nice features to download. I will definitely buy it again. In fact, I also bought a 20A version for my car camping.
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