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Yep, golf cart batteries would be deep cycle as would fork-lift batteries, both would be suitable but I found that batteries made/marketed for a specific purpose were inexplicably more expensive that a general deep cycle battery of exactly the same specification.
The cheapest decent quality deep cycle batteries I could lay my hands on at the time were Trojan T105 which are a wet lead acid type. I installed 4 of them in series to give me the 24VDC that the inverter required. I've had them now for about 4 years and they've seen about 200 full cycles and maybe 25 partial discharge cycles and they're still in great condition. We had a planned power outage the other day that was for 6 hours and the system ran the entire time and still had about 30% left in reserve when the power came back on. Finger crossed they last another 4 years without problems.
The cheapest decent quality deep cycle batteries I could lay my hands on at the time were Trojan T105 which are a wet lead acid type. I installed 4 of them in series to give me the 24VDC that the inverter required. I've had them now for about 4 years and they've seen about 200 full cycles and maybe 25 partial discharge cycles and they're still in great condition. We had a planned power outage the other day that was for 6 hours and the system ran the entire time and still had about 30% left in reserve when the power came back on. Finger crossed they last another 4 years without problems.