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Old 12-22-2016, 10:20 AM   #1
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Dimensions 12X20B3R4T inverter

The owners manual for this inverter states that it supports either a wet cell or sealed wet cell deep cycle battery for charging purposes. Since I need to replace house batteries soon I was looking at upgrading to an agm type battery but I am not sure if my existing inverter/charger will support them. I have been told that the Agm batteries do not like a high charge rate for any extended time. My question is has anyone been able to successfully use Agm batteries with the dimensions inverter/charge that Winnebago seems to use in the past?

In addition I plan to switch to 6 volt house battery setup and since I need to make new cables would welding cable in a 3/0 size be sufficient for a four battery setup?
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Old 12-22-2016, 11:13 AM   #2
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In my previous coach (2010 Tour) I had a dimensions inverter and 12 volt batteries. I switched to AGM 6 volt. I called Dimensions and they told me how to set up the inverter to charge the AGM's I suggest you do the same. Welding wire works great.

I also have a factory rebuilt 2000 watt Dimensions inverter that I'm eventually going to sell. Got it when my extended warranty covered a new inverter and the dealer was going to throw away my old inverter. I sent it back to Dimensions and had it rebuilt.. I may end up selling that unit as my New Newmar uses a Magnum inverter.
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Old 12-23-2016, 10:40 AM   #3
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I've had a Dim 2000 w in my 2004 for 10 yrs along with 4 6v T-125 golf cart batteries. I always had problems with acid boiling out of the caps and adding water every 2-3 months. I hated that acid mess and 3 yrs ago installed 4 AGM batteries. After 1 year I had to have all 4 AGM's replaced under warranty as they had greatly reduced capacity (maybe 1/2). Along with the new AGM's, I replaced the Dim with a Magnum 2000w true sinewave inverter.

There is a serious issue using the Dimensions 2000 because it goes into a automatic equalizing charge process every 4 or 5 times it's powered up and that lasts about 6-8 hours. I believe that later models do the equalizing process every 10 or 20 cycles but when I talked to the factory there was no upgrade for my 2004 version. I would minimize the high charge rate by limiting the Dim to 5 amp input current.

AGM's do not like the 15+ volts the equalizing charge puts out, especially for 8 hours! Normally AGM's don't require any equalizing at all and some manufactures say never do it.

I really liked my Dim all those years, it never failed & it was pretty efficient for dry camping for long periods with minimal operation of the generator. But I think your Dim will damage your new AGM batteries.
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Old 12-24-2016, 09:28 AM   #4
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Thanks for the info. I was able to contact a representative of the company and this is what they told me -

The charger will charge up to 14.4VDC in the bulk and acceptance mode and around 15VDC in the condition mode when set to the "sealed" battery setting, if the AGM's you are considering will accept these parameters, then it would be safe to install them.

They also said my unit will go into the conditioning mode every 10 th cycle -

The charger will go into the conditioning mode every 10th charge cycle or more precisely every 10th time the charger completes both the "bulk" and the "acceptance" modes.

It appears like it would be charging on the high side according to the lifeline specifications, especially during warm weather. The coach came with 4 12 volt nappa 7236 12 volt batteries which do not appear to be true deep cycle batteries., although they have performed well.
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