the batteries are the heart of the system dont skimp..the prewire is usually from the roof entry point to the battery area. check the wire size and measure the wire length to figure the max safe amperage carrying capability,
The solar needs to be enough to charge the battery bank faster than you use it.
Be aware that lead acid should only be drained to 50% then recharged so if you have 224AH you can only use 112AH to keep batteries happy. If you can afford lithium more expensive but the 50% rule does not apply. JMHO
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2020 Precept 34G,
600w 24v solar, Victron 100/50 -BMV712 LiBim 225 BB 200ah. Stehl Dolly, Safe - T- Plus. More to install
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