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I have (4) 160 watt solar panels, 60 amp mppt charge controller, and (2) renogy 100ah smart lithium batteries. My batteries are 30 months old. I would like to add one more battery to make 300ah but I've been told it's not a good idea. I'd like some of everybody's thoughts. Thanks

I'm thinking about doing a DC change over kit on my Norcold rv refrigerator to allow better and consistent temperatures. This helps with less energy consumed as well as maintaining good low temp while driving long distances. This would require me to install a Renogy dual MPPT dc-dc charger from...