AJMije is AARight
I agree with AJMikes comment.
We boon-dock a lot and had constant battery charge anxiety.
Installed lithium batteries and replaced WFC controller. It has been a great upgrade. It was not cheap however. About $1600 all in for 2 Battleborn batteries and controller - self installed. Did not have to worry about alternator in our case.
With solar and lithium we have no battery worries like before. I have no regrets about the upgrade.
I also no longer have to worry about battery maintenance. Adding water was a pain because our batteries were not easy to service in location under the step
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