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We just installed two of the CIGS panels Will reviewed above on our boat's canvas dodger top. Seems great so far, very easy install.

ABYC is a voluntary standard, but it is the most important standard in the US pleasure boat industry. Following the ABYC electrical standards is almost mandatory if you don't want to be sued as a builder. For owners, it's also a good way not to sink your boat, but the only time it might be...

While I haven't tested both, I think MPPT chargers are the most efficient setup possible right now. Also it seems a bit simpler - You can put some panels in parallel or series and reduce the cost of electronics.

Bought one of these last year for a horse trailer/RV application and it appears to work well so far. Seem like all the features you would want (heating, low temp cut off, and bluetooth management) in a better value than Li Time or other budget batteries. Might grab another for a boat.

Java Energy Smart batteries showed up recently on Amazon $339 for 100ah. Nothing else in this price range seems to be offering low temp charging (heated) and Bluetooth BMS monitoring. This almost beats my diy cells. Thoughts? I don't see much for web presence, youtube reviews are thin, and...

It seems like sticking with just mpp solar chargers would be best to charge your battery rather than dc to dc converters.

Another possibility is to charge only one battery, then relay it to the others with ACRs. This would be simpler for the solar charger. https://www.bluesea.com/support/articles/1366/Automatic_Charging_Relay_%5BACR%5D_Explained