Skinners1, can you tell me what brand and model batteries you used?
Looking at US Battery, Trojan and Fullriver (AGM)
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I use US Battery 8v for our stbd/house and port start bank, no problems with the outback inverter either.
Are these the FLA or AGM? Do you recall the model?
US Battery said they are concerned with the battery posts (1/4" stud) on the FLA 8V and said they would only recommend the AGM version for that reason as it also has automotive sale terminals.
Seems hard to find (if any) golf cart batteries with Marine style flag terminal.
Even the AGM's from Fullriver are recessed (bolt down) terminals, but at least they are supposedly brass, not lead - so less prone to melting.
There are screw in SAE post available.
Examples;
https://www.ebay.com/itm/31514050821...221094352e056a
https://www.ebay.com/itm/37511036398...cf40849ce1f33a