Ooooops senior moment. I use solar and the the Batterymnder desulfonator. Works great.
That's the device the giant RV corona, sales manager, service manager had no frigging idea st to what it was. My batteries had died while in their shop. I told them once, then twice, and when he asked the third time I sad Sr. It hasn't changed since the first time I told u what it was. It is still a desulfonator. He blew, told hm he was a stupid bully, got kicked out which turned out to be the best because I easily fixed the remaining issues with Thor Warranty help, now I know how to do stuff.
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