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I used to run 12" DOB GoTo and three dew heaters (through an Orion Dew Zapper controller) and a small fan.
These were not all running together full blast all the time.
But I did get through each night's observing on one battery.
Maybe not ALL night, but till way after midnight.
18aH deep cycle.
Like this one from Jaycar $80
It fits on the outside rim of the mount base
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