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Old 01-07-2015, 06:27 PM   #1
SouthernBusches
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Inverter battery for 3511 RE

We have a new Alpine 3511 RE and believe the wrong battery has been put in for the battery for the inverter. Does anyone have the specs on the battery that it should be?
Thank you for your help.
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Old 01-07-2015, 06:42 PM   #2
chuckster57
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Welcome to the forum

By wrong battery, do you mean wrong group, wrong voltage?

What does the inverter provide power for? How many watts is it? Do you know what battery they installed?
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Old 01-08-2015, 06:06 AM   #3
SouthernBusches
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The battery they put in was a small car battery. It was dead with in 1 hour of being on the road. This is the first unit with a inverter battery this company has ever sold. This morning is full of research!
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Old 01-08-2015, 06:30 AM   #4
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Without knowing the group size , rated amp hours and load, it's near impossible at this end of the inter web to say for sure.

If your trailer is plugged into the tow vehicle and everything is working properly, the trucks charging system should keep the trailer battery charged and it shouldn't go dead in 1 hour.

Are you sure the 12V charge line is active at the bumper?
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Old 01-10-2015, 04:12 AM   #5
WaltBennett
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First off, are you certain you have an inverter (inverts 12v DC to 120v AC)? Unless you've a residential refrigerator, you probably only have a converter (converts 120v AC to 12v DC), but the single car battery should have lasted longer anyway unless there was some sort of DC load on it (lights on, etc.)

Second, if you do have an inverter, a single battery of just about any group size won't last long if the inverter is on and supplying 120 volts to something. I've four big 6 volt batteries that will last something over 12 hours providing 120v through my inverter for moderate to light loads, but that's how I designed the system. (They get charged back up by either the solar panels or shore power.) I've heard of several folks that bought units with residential refers and moderate sized inverters that had issues with either insufficient batteries, insufficient inverter size, or both.
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Old 01-10-2015, 07:12 AM   #6
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I think we need more info on what you have. If you have a 120volt ac electric only residential refrigerator, and it was on, that battery life may not be too long. Like has been said, be sure your truck is charging it.
I was talking to a Keystone salesman 2 days ago. We were in a Montana with a residential refrig. I asked how long it would run off the battery, he said about 18 hours.
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Old 01-11-2015, 02:10 PM   #7
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Quote:
Originally Posted by gearhead View Post
I was talking to a Keystone salesman 2 days ago. We were in a Montana with a residential refrig. I asked how long it would run off the battery, he said about 18 hours.
I'm positive that rep was assuming it was a good deep cycle battery, not either an automotive or a half & half. No matter what, I wouldn't have less than two of the biggest deep cycle 12v batteries I could find & fit in if I had a residential refer. Nothing like having food rot inside one and having to clean it out - it's damn near impossible to get the stink gone.
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