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post #43 of Old 10-09-2012
Maine Sail
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Re: AGM Battery Upgrade and Charger

Originally Posted by dvuyxx View Post
So far this is what I have ... pretty low draw I think:

Endless Breeze 12v Fan 3.0
LED interior lights 0.5
Nav LED running lights forward 0.5
Stereo 1.0
Raymarine x-70 Autopilot 5.0
Garmin navigation GPSMAP 500series 1.0
Cockpit VHF Standby 1.0
Depthmeter 1.0
Speedometer 1.0

Total so far - 14.0 ah

Let's now say you go for a 5 hours sail, spent 10 hours sailing on the Chess htis past saturday so not uncommon...

Your Ah draw is now each device X 5 (except nav lights which would be used less hours)..

So for a 5 hour sail...

Speed = 5Ah
Depth = 5Ah
VHF = 5Ah
AP = 25Ah
Stereo = 5Ah
Fan = 15Ah

Excluding nav lights you are somewhere around 65Ah / day for a short 5 hour sail....

You would be very well served by a battery monitor so you know the actual average daily consumption. Theoretical and real consumption are often quite far off... It will make sizing a solar panel easier. Either way you are likely below 80%SOC so sizing a solar panel to replace that 20% in a couple days is wise.... This will likely be bigger than 25W...

-Maine Sail / CS-36T

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