Join Date: Jan 2003
Location: Maine Coast
Thanked 301 Times in 233 Posts
Rep Power: 18
Re: AGM Battery Upgrade and Charger
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
Raymarine x-70 Autopilot 5.0
Garmin navigation GPSMAP 500series 1.0
Cockpit VHF Standby 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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