What size batteries?

[Travel]

We have a 2021 grayhawk that we bought in January. We are looking at a trip to the rural area in California and doing some boondocking. I would like to upgrade the house batteries. The manual says these are group 27 but they are way to long. I tried group 24 but they are less amp hours. The bracket that holds them is set up for two batteries that are 10” long. Group 24’s are 10.125”. There’s no markings on the one battery that the dealer installed and they are no help. Anyone have any ideas?
Thanks
Barry

[Grumpy]

Do the 27's fit the other way? (Turn them 90 degrees)

[Marcm157]

I just replaced the batteries on my Father in Laws 2018 Greyhawk. They were Group 27's and I replaced them with 31's. I did have to make some modifications to the hold downs but NOT the battery tray itself.

[pconroy]

Originally Posted by Travel

I tried group 24 but they are less amp hours.

True - but not by that much. 10Ah, maybe. Then figure you can only use 50%, you're about 5Ah give or take.


So, while I'm not answering your question (mine is a Group 27), I wouldn't sweat a 24 too much if that what fits.

[Travel]

Originally Posted by Grumpy

Do the 27's fit the other way? (Turn them 90 degrees)

Nope. Only 6.5 that way
Thanks

[Travel]

Originally Posted by Marcm157

I just replaced the batteries on my Father in Laws 2018 Greyhawk. They were Group 27's and I replaced them with 31's. I did have to make some modifications to the hold downs but NOT the battery tray itself.

They must have changed the battery tray because I have two 10.25” areas for the batteries to sit. There’s no way to fit any larger batteries in that area.

[dvspl]

Not sure which Greyhawk model you have. My 29MV fits two Group 24s under the entry steps. I replaced the single Group 24 the dealer provided with two Lithium 100 AH. Most of the Lithium batteries (e.g. Battleborn) are Group 27 size so it takes some looking to find ones that will fit. I used Renogy but others will also work.

[Jagiven]

If you are going to Boondock, consider 6V Golf Cart Batteries. I think they are 10.25" too. I suspect the big issue is the plastic battery boxes. As mine are a lot bigger than the battery.

In reality, not a big deal. Get yourself a 2x4. Cut 2 pieces to the required length. Cut a slit/dado in the ends, so the 2x4s can sit on the bottom of the battery rack and avoid the metal side frames. Place your new battery box(s) on the 2x4s. Once happy. Drill thought the box, lumber and the metal battery rack. Install a couple 1/4" carriage bolts all they way through and secure. Install the batteries. The boxes over hang the metal tray, but are fully supported, and solidly secured. Also drill in a weep hole or two for draining any condensation that builds up in the box. I bet you could also do this with 1x4s too. If you like you could paint the lumber.