I am still wayne_tw wrote:
When using two 6 volt batteries wired in series, you double the volts but the amp hours remain the same.
When using two 12 volts wired in parallel, you double the amp hours but the volts remain the same.
Therefore, using two 12 volt batteries you will have greater capacity for the size of the battery bank than using two 6 volt batteries.
I agree with Wayne for the most part. The advantage to true 6v golf cart batteries is the plates are thicker and can take more abuse with heavy discharging. Other than that volts are volts and amp hrs are amp hrs. Just my 2c.
Another point, if you do a cost analysis, two 6v golf cart batteries aint a bad proposition and IMO are a good long term value.