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Old 07-15-2017, 06:01 PM   #1
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Battery Life

What are reasonable expectations for daily battery life when not hooked? New, good Interstate deep cycle, and watered up batteries seem to last very short periods of time. We don't turn on lights unless necessary, heat very little, use water seldom, no showers. Yet, we get 1 day MAX and then we need to go to generator or start the vehicle. After doing the appropriate charge, we get 3/4 of a day maybe. Am I doing something wrong?

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Old 07-15-2017, 06:09 PM   #2
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What do you consider an appropriate charge.

Most folks run the generator for 2 hours in the AM and 2 or 3 hours in the PM.

Unless your charging them 4 hours or more, you may be leaving then undecharged for the next usage session.
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Old 07-15-2017, 06:20 PM   #3
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You say heat - if running the propane furnace it's typically the biggest consumer of power. It's the fan.
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Old 07-15-2017, 08:58 PM   #4
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Ah ha, I may have uncovered most of the problem. The most I have ever run the generator is 30 minutes. As far as heat goes, maybe 20-30 minutes a night.
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Old 07-15-2017, 09:09 PM   #5
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Yep, not enough run time. 2 hours will usually get you 80% charge and not worth trying to get to 100%, which could take another 2 to 4 hours.
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Old 07-15-2017, 09:10 PM   #6
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A single Interstate hybrid battery is hard pressed to go overnight for much of anything in an RV. You'll need two to run a few lights, an RV fridge, and especially the furnace. And yes, you'll need to run the genset until the batteries show no less than 12.8v.
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Old 07-15-2017, 09:27 PM   #7
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Curious: how many batteries do you have; what type, eg 6v or 12v; what type of refrigerator--residential or RV?????? Also note that to determine true battery state of charge [SOC]; the battery bank has to be at rest for a minimum of an hour or two. So if you are charging the bank, the voltage may show 13-14 volts during charge, but will move toward actual SOC as batteries return to a more steady state condition following the charge cycle.
Really need to know more about your rig before we speculate on what if anything might be wrong with your charging equipment....
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Old 08-19-2017, 06:57 AM   #8

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We boondock a lot in our TT. When my batteries start to get low (usually on day 3 or 4), I do the following: (a) start the generators and plug in the TT; (b) disconnect the batteries from the TT; (c) hook a standard battery charger to the batteries, plug it in, and charge till they are full, around 3-4 hours. We're then set up for another 3-4 days.
I do this because I have found the charger built into the TT is basically a trickle charger, does not really put much back into the batteries except a surface charge (hooking up the TV has the same effect).
I Hope this helps. My charger has a meter built in that shows how much charge I am putting on the batteries. I am running 2 Interstate 12V deep-cycle batteries.
When we boondock,we are aware we are on batteries, but still use TT lights, shower, etc. very similar to normal. DW would not have it any other way.
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