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A common rule of thumb for sizing batteries to solar power relates nominal panel output in Watts to bank capacity in Ah.
1:1 == 200W1) solar + 200Ah battery bank.
2:1 == 200W2) solar + 100Ah of battery. (overpaneling)
1:2 would mean 100W3) solar + 200Ah of battery. (underpaneling or overbanking)