Forum Discussion

HVFDFIREFIGHTER's avatar
Apr 28, 2015

BATTERIES

I recently have purchased an off grid hunting camp. I have purchased two GC2 batteries from Sam's club, each 6 volts and 215 amp hour. I will be connecting the two together in series (A positive to B negative) (B positive to load/charge and A negative to load/charge)

I bought a crappie schmacher "smart" charger, connected it to the batteries, it wont do anything. Connected it to a couple of other batteries still would not work (lawn mower, motorcycle). I will be sending it back.

With the batteries connected as stated above, I should be charging in 12 volt mode correct?

What is a good cheap quick smart or 3 stage battery charger? I will be running the battery charger on gas Yamaha 2000 watt inverter. I don't want to run the inverter all day.

I know to figure out how long to recharge is battery amps / by charger rated amps + 10% In my case, 215/30=7.2 + .72= 7.92 (8 hours) that's a long time. Maybe need a 40amp (about 6 hours to recharge)or 50amp (about 5 hours to recharge) Those hours are from complete dead state which "should" never occur. From the batteries, I will only be running a few cfl lights, maybe a fan, and maybe a radio for 5-6 hours at night. then recharging during the day.

Any help would be greatly appreciated.

17 Replies

  • Ductape wrote:
    How long do you stay, and how long between stays? I do the same thing with a small solar charger, but we are gone more than we are in the cabin.


    Will be staying weekends mostly. Maybe weeks in summer. Thought about sat to keep topped off
  • enblethen wrote:
    Have you checked to see if the charger fan comes on when connected to battery before you plug into 120 volt receptacle?
    Verify polarity connections on charger to battery. Red clip should be positive.
    I have a couple Schumacher chargers and both work very well.


    No fan. I changed leads to reverse order on purpose and lights still never came on. The leads are bare metal and the battery terminals are clean
  • I have a Stanley 40 amp charger and it will not start a charge if the battery voltage is too low. I have to use a "Dumb" charger to get the voltage above the threshold and then I can use the Stanley.

    A 40 or 50 amp charger is not going to be cheap. You may want to consider buying an RV converter/charger.
  • How long do you stay, and how long between stays? I do the same thing with a small solar charger, but we are gone more than we are in the cabin.
  • Have you checked to see if the charger fan comes on when connected to battery before you plug into 120 volt receptacle?
    Verify polarity connections on charger to battery. Red clip should be positive.
    I have a couple Schumacher chargers and both work very well.
  • Maybe something like this in a 25 amp version. If interested, contact them to find out the charging voltages. I see that it does have an equalize mode. $295 with temperature compensation. It will also last a life time.

    Quick Charge