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Old 10-12-2015, 09:32 AM   #1
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Battery and Inverter Upgrade

Starting a new thread on my battery and inverter upgrade to post incremental progress rather than telling the story when I'm done. There is just enough room under the Sprinter XL of my Interstate to install two Lifeline GPL-4CT AGM batteries on each side. This is the same area that Airstream now installs the batteries on all new Interstates. I'll have 440 AH of capacity with four 6 volt batteries in series-parallel arrangement. My goal is to use the microwave when camping without hook-ups. A battery and inverter upgrade was always part of my long term plan when adding 400 watts of solar. I looked at using large lithium batteries but concluded that I'd have to add even more stuff to make a lithium upgrade work. I didn't want to give up any internal storage space so putting the batteries under the van seemed the best place. I'll remove the original battery box under the lounge seat and install the inverter in that location.

Here is a photo of a battery rack on the floor of my shop.
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A view of a rack installed without batteries during one of my many fit checks. The clearances in this void under the van are less than 1 inch on either end.
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I have to use a small floor jack to install the batteries as seen in this photo.
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I did a road test yesterday with batteries installed and it works as planned. Photos of both racks with batteries installed.
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That last photo also shows a new junction box I added to relocate wiring from the generator, which needed to be moved to make room for batteries on the driver side.

I'll post progress as I move forward. I removed the racks after the road test and will now paint everything before the final installation.

- - Mike
2013 Lounge EXT on 2012 Sprinter
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Old 10-12-2015, 02:25 PM   #2
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Make mine Orville Redenbacher please

While I commend you on your efforts, Man that is a lot of work. Results should be worth it though.
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Old 10-12-2015, 02:35 PM   #3
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Looking good. Where did you move the generator? Or just shift a little?
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Old 10-12-2015, 05:10 PM   #4
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Make mine Orville Redenbacher please



While I commend you on your efforts, Man that is a lot of work. Results should be worth it though.

Yes - it has turned out to be more difficult then I thought when I started. Fortunately working on my Interstate is part of my a hobby to fix things. This last spring I installed 500 sq.ft. of solid oak floor on the bedroom level of our town house. That was even more work.


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Old 10-12-2015, 05:14 PM   #5
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Looking good. Where did you move the generator? Or just shift a little?

I just have to relocate the 120V AC wires from the generator. Also have to reroute the generator control cable. They run right though the area I'm installing the new batteries. Generator staying in the same spot.


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Old 10-12-2015, 07:08 PM   #6
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you are amazing
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Old 10-12-2015, 08:00 PM   #7
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Good job!
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