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Without going into to much technical stuff, I would have 2 systems independent systems for redundancy maybe using an ATS , so that your solar will charge bank A and your Genset / charger will charge bank B and use a bus tie or automatic transfer switch to tie bank A and Bank B together when the voltage drops below a usable threshold
Or if you have the dollars have two totally independent battery systems ( one via solar and one via genset ) that can handle say 15 hrs of full load operation each and use a transfer switch when bank A voltage drops below useable threshold and bank B comes on line
I think a 1+1 redundancy system is the way to go if want really good reliability but it’s extremely costly !!!
I’ve been too long out of the game ( Commercial Industrial Electrical Engineering and Contracting )
Maybe some younger electrical guys can jump in
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