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post #44 of Old 10-09-2012
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Re: AGM Battery Upgrade and Charger

For 5 hours, then anchoring over night -

So for a 5 hour sail...

Speed = 5Ah
Depth = 5Ah
VHF = 5Ah
AP = 25Ah
Stereo = 5Ah
Fan = 15Ah
Take out the AP, GPS Speed and Depth, then add in more lighting and fans plus a anchor light (some are 1amp per hour, some are less).
Add back in the AH you get WHILE you are sailing and sitting (I got 30-35 a day with my 80w panel).
For multi-day anchoring out figure 40-50 ah a day on the hook. If you have a standard 50amp alt you really need to know that 1 hour at idle is REALLY only 20-25 amp.

Now figure your panel(s) for that.

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