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Fastfwd75's avatar
Fastfwd75
Explorer
Jun 10, 2014

Battery was doing fine on the fan but the lights deadly

Was testing my battery for future dry camp use.
Had the vent fan on for 5 hours and the battery still showed full.
Added 3 lights fixtures(total 6x921 bulbs) for 40 minutes.
The battery shows 1/3 full with everything on; completely full as soon as I turn off the lights. Goes back to 1/3 if I turn them back on. I suppose the reading is supposed to be taken with a power draw active? Was my full reading after 5 hours of fan only wrong in showing completely full?

If not then the vent is not a worry but lights are for emergency only with only a few minutes use before the battery is drained; better rely on portable lights. Also need to keep some for the eventual cold night and fire/co2 alarm.

This is from a single 12v group 24 battery. 2 weeks old.
  • First, you can't judge anything by a battery indicator light panel. You have proven that by using the draw of 6 light bulbs. If you would let the battery rest between short sessions of just using those lights, the battery indicator will show fuller than when the lights are on. Use a hand held multimeter across the battery terminals.

    FWIW, a single grp 24 battery doesn't hold a lot of amp hours. A battery addition or upgrade is a good modification to keep the 12V bogeyman away.
  • RoyB's avatar
    RoyB
    Explorer II
    Has the light come on yet on why everyone is changing their incandescent automotive lamps out for LED BOARDS????

    Roy Ken

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