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Recently changed & added dew heaters and as Alex says, they are power hungry things. I have been running everything off 40AH of batteries without a problem but now I don't have the power for a full night - and I haven't added a cooled camera yet. I need to connect the charger halfway through. I run 2 or 3 dew heaters - scope, guide & DSLR camera lens when I piggyback. So upgrading to a 100AH battery. Lithium is good if you can afford one - lighter weight, larger possible draw down - but an AGM is fine.
Cheers,
Mark
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