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Rmack1's avatar
Rmack1
Explorer
Oct 01, 2014

Battery Life and Low Temps

I have been having a ball up at Iris Meadow off of Rock Creek Road, Close to Mammoth Lakes, CA. It's the steeper side of the Sierras just East of Yosemite. It's a little known area comparably, but very nice indeed.

For the first time, I've used my TT in low temperatures. It snowed very lightly one day, and we had no problems. However, the next day it sort of sleeted. It looked like snow, but it formed a crusty frost on the ground and on my vehicles.

I was able to keep my Yamaha generators running (one at a time) by shielding the business side with it's plastic tub positioned over it, hooked on top. I kept the exhaust open, and the intake filter clear. It worked great. I know it was dangerous, and I watched it like a hawk, but since there was no wind at all, it worked. I was ready to shut down and go on batteries if I couldn't keep it safely dry.

After finally shutting down early in the evening at about eight and going on batteries, I retired with the DW.

Round about six in the morning I heard the furnace come on and shut down a few seconds later, long before warming things up as it had been doing all night long. This happened again, and I determined that this occurred when my batteries were reading one light on my sensors.

I have two 12 volts, and they have always lasted way beyond one night of running our fan and such until this morning.

My question; Did the extremely low temperatures cause my batteries to stop providing enough current to run my furnace? I ran out and started my gennie when this happened, but I'm curious if I would have seen recovery when then temps went up later in the day. BTW, it seemed that other 12 volt equipment still worked.

123 Replies

  • I did not see you mention age of batteries. If you did forgive please. My guess they were not fully charged when you switched off generator. I can go three days with furnace using my twin group 27 deep cycles. I charge with a high amp charger through my generaator not relying on my power converter. Have your batteries load tested. If fully charged temps are a minor factor. We have camped in 15 degree temps for days
  • cold temps are a double wammy. first, you likely need more furnace, second battery capacity drops with low temp. Don't recall the exact numbers, but by 0F battery AH capacity is down something on the order of 30% or more.

    One light on the battery indicator is really low. However, the question is why did the batteries get this low?? Low temps reduce capacity, but unless other things had been drawing current, the furnace should have worked.
  • Hi,

    There would be nothing to recover. Also recharging needs a higher voltage as temperature drops, so the converter won't do as good a job. I have camped at -37 c (-34 f).

    Have a look at this chart:

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