Thanks!
My current batteries are most likely the OEM Napa AGMs that were installed 10 years ago at the factory.
Or they may have been replaced, I haven't dug one out to get the date code. They last about an hour under a standard load so who knows.
Our current MO is hookup to hookup usually with the generator running to provide AC. So weak batteries aren't an issue yet. I ran the cost analysis and Lithium isn't quite there yet for me.
VMax Tanks will be getting an order from me in the near future.
Aaron