Hi John,
I agree with Ken replace your battery bank with new batteries. I am posting a link to Lifeline AGM's if your interested.
Sean
Link: <a href="http://www.amazon.com/gp/product/B0029XJ1UQ/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative =9325&creativeASIN=B0029XJ1UQ&linkCode=as2&tag=aff iliatechie-20">Marine Lifeline AGM Battery - GPL-8DL</a><img src="http://www.assoc-amazon.com/e/ir?t=affiliatechie-20&l=as2&o=1&a=B0029XJ1UQ" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />
Product Features
- Expected Cycle Life 1,100 cycles to 50% DOD
- 500 cycles to 100% DOD
- Maintenance Free
- Fastest Recharge, Lowest Discharge Rates
- User Safe (sealed construction, non-spillable, submersible)