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I carry my 5 amp Battery Tender [ waterproof ] and a short extension cord. I place the BT on top of the DEF tank and run the extension cord to the plug in the back for the block heater. Even when I'm on shore power.
If I'm not plugged into shore power I just plug it into some convenient 120v source.
It's way too hot here in FL to leave the shore power plugged in all the time, it's really hard on the electronics and appliances if you don't run the AC.
When the coach is home I just run a 120v extension cord out there from the shop and keep the chassis batteries fully charged.
I absolutely hate the way the BIM charges. Best charge is to bring the battery up to float and hold it there. NOT cycle it constantly between float and 2.6 - 2.8 vdc.