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The Optima Yellow Top version is meant for electrical demands where the batteries are drawn down further between recharge cycles. The Red Top version is meant for high draw engine startup. You might find their FAQ interesting: http://www.optimabatteries.com/en-us/support/faqs

There are some better choices if you want to get batteries specialized to solar applications. I like the Optima so that the system can be split up and reorganized if I ever need that flexibility. Since my system isn’t meant to wholly power my home but just be a useful supplement in a grid down situation they are good enough for the purpose.

So long as I don’t run out of time to prepare I will eventually get Iron Edison batteries for my off-grid solar solution but they are very expensive.