AGM Batteries and Inverter - What Is Best For My Needs?

Thanks all. I may have confused you guys a little - I don't think they went bad, I think they were left unattended several months without being unplugged. My question is whether the current Lance setup will handle the AGMs or if I need to change any component. Some have said to simply switch. Others have spiralled off into unknown (to me)acronyms with all sorts of changes. If it helps at all, we have agen set and no solar.
Thanks again,

Shiv