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I am sorta stuck on the reason why people are going for deep cycle batteries. In my days of solar remote access deep cycles were only used for setups that were in most cases not monitored or difficult to access. These are expensive batteries!
Realistically normal gel batteries are all that are needed and calulation based on typical use is the cheapest most effective method of a power configuration. You can buy lower cost larger capacity regular batteries compared to deep cycle battery.
Car batteries even low maintenence are simply no go, out gassing is too impractical and risky.
Alway calculate headroom to cover extra used in most cases 10%, cost factor you can sometime go for 20%
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