If you are looking to replace your batteries these may be of interest. http://fireflyenergy.com/
I looked at them a few years ago and would have gone that way except I found a deal on Johnson Controls AGM group 31s, $160 CND instead of $400. The technology is not a gimmick, the research was done by Caterpillar to find a better product for their needs. Possible weeks of non-use, high cranking amps particularly in cold weather and the ability to recover from a deep discharge. The pricing is in line with Rolls or Lifeline AGM offerings. https://www.bruceschwab.com/advanced-energy-storage-systems/firefly-energys-oasis-group-31/ https://www.practical-sailor.com/blog/Can-Carbon-Foam-Batteries-Meet-Hype-11694-1.html There are quite a few positive reviews and installation blogs on the internet. I have not seen anything negative or reporting a fault but the technology has only been in common use for about 10 years. https://www.panbo.com/gizmos-new-firefly-battery-bank-working-out-the-details/ Michael Brown Windburn C&C 30-1
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