Just called up the local battery place and checked out what they had for deep cycles. They have the following available:
Group 24 - 85 Ah - $80
Group 27 - 95 Ah - $86
Group 31 - 105 Ah - $100
I had used 70 Ah as the capacity for a group 24 battery. Looks like they have a bit more than I had thought. Good for another few minutes of run time at least. However, it looks like the group 27 is the best bang for your buck.
Edit:
I also called up another place. They said they could get me a group 27 battery rated at 105 Ah for $92.
Last edited by Daox; 08-06-09 at 10:28 AM..
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