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Old 04-15-2015, 05:24 PM   #1
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Battery life for 2014 Tiffin Allegro 37LA with Residential Refrigerator

We own a 2014 Tiffin Allegro Open Road 37LA and have the residential refrigerator option, which we really like. However, we like to visit national parks, which do not have hookups, and it seems to us the battery voltage runs down too fast. On our last outing, even with nothing on in the coach (no lights, TV, radio, furnace, or anything else), the batteries ran down to a low voltage (reading of 11 on the monitor) within a 6-7 hour period.

Any suggestions on things to look for that might be hidden draws? We check the batteries faithfully, they are filled appropriately, and are fully charged (according to the inverter) at the start of the period. They also seem to take a long time to charge when we run the generator, even though we turn the inverter switch to "charge only".
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Old 04-15-2015, 05:45 PM   #2
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How many batteries do you have? Also maybe you want to think about adding solar power to you roof.
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Old 04-15-2015, 07:01 PM   #3
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Have you ever run the batteries dead?

Did they ever sit dead for weeks at a time?

Do you run them down to 11 volt all of the time?

Did it sit on the lot with dead batteries, before you bought it?

Any of these things can kill batteries.

It would be a good idea to get them tested.
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Old 04-15-2015, 07:17 PM   #4
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Quote:
Originally Posted by twinboat View Post
Have you ever run the batteries dead?

Did they ever sit dead for weeks at a time?

Do you run them down to 11 volt all of the time?

Did it sit on the lot with dead batteries, before you bought it?

Any of these things can kill batteries.

It would be a good idea to get them tested.
I agree with the above. My batteries last 14-18 hours before the auto start generator kicks in and I run other things besides my residential frig.
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Old 04-15-2015, 07:34 PM   #5
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We have the residential fridge in our MH and 6 to 7 hours is about all ours will run before dropping the batterys to below half charge. I have not let the batterys get lower than that to see how long it would run. We only have two coach batterys but since we don't dry camp it is not an issue for us. Nothing like the 48 hours the dealer said they would run.
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Old 04-15-2015, 08:23 PM   #6
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Again, there is a chance the batteries were bad when you got it.

Testing is free.
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Old 04-15-2015, 08:48 PM   #7
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The number of batteries you have and the amp hours they are will also have a lot to do with the number of hours between charges.

You could upgrade above factory installed batteries to AGM 440 amp hour for the way you enjoying using your MH. Most factory installed batteries are not intended for long periods of boondocking, but more for shore power and traveling between plug ins.

Adding solar or increasing battery size will help your problem, if your batteries test good.
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Old 04-15-2015, 11:09 PM   #8
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11 volts is way to low to drop batteries down... a sure way to kill it. 12.1v is 50% SOC and should never be drained lower than that. I would invest in a battery monitor that uses state of charge (SOC) calculation. Using voltage as a guide to start a generator is also not the best practice, SOC should be used instead since it uses other variables like temp, in/out current draw (shunt) etc.... also having to use the genny to top off the batteries to 100% SOC is not practical. It takes a long time to top off the last 10% SOC of the batteries. Why have the 5k-7k watt genny use all that fuel to pump out millamps. I would use the generator to start at 60% SOC and stop at 90% SOC. Shore power is best to top off the batteries.

Also, there are always parasitic loss on batteries such as the radio or the invérter... even just sitting with nothing on the batteries will drain. I would check the charging system (bird), batteries, maybe you need new ones or install more efficient lighting etc... every little thing to conserve power helps.
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