Originally Posted by Catch and Release
We have owned our MH for 3 years but have never really dry camped. Next year we will be driving to Alaska and the boondocking opportunities are plentiful. I don't want to wake up some morning and discover dead batteries. I do have auto start capabilities for the generator but I also don't want to wake the world at 3 AM.
How can you tell what charge level your house batteries have remaining? Other than recording the amperage usage as an average the only other method I guess would be voltage. Is there a chart for this somewhere that is battery type specific?
the other posts have good info.
discharging your battery bank over 50% is called ''deep cycling'' and shortens the life of the batteries.
i will post some links that explain this better.
my batteries have 300 ah capacity, so i only want to use about 150 ah before recharging (about 12.1 v.).
here is some approximate consumption data for 12v items: (actually about 13v.)
12v, 18w lamp: 1.4 ah
12v ceiling fluorescent lamp: 30 w, 2.4 ah
12v reading lite (1383) 20w, 1.6 ah
12v fantastic ceiling exhaust fans, 3 speed: 1.9, 2.3, 3.0 ah
furnace blower suburban sf-42: 11.5 ah
refrigerator, norcold n822: 1.2 -3.0 ah
water pump, shurflo 2.8 gph @40 psi 7 ah
vector modified sine wave inverter, 750 w: .6- 57 ah
12v 3 speed bedroom ceiling fan from backwoods solar: .5- .75- 1.2 ah.
from this data you can figure about what your consumption is per hour and how long your battery bank will last without deep cycling.
now the links:
Batteries -- and Other Electric Stuff by phred
The 12volt Side of Life (Part 1)
Deep Cycle Battery FAQ