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Medley86 wrote:

wil wrote:

pbwalker wrote:I know we have some RVers on the forum, so I wanted to see if I could possibly glean some knowledge from y'all.

I just traded in our 2011 23' TT for an 18' Off-Road TT, and I'm setting it up for boondock camping. I was able to keep my battery from the old RV, and it's a 8 month old Type 27 1000 CCA Marine Battery from Duralast. The new RV came with some brand I haven't heard of, but it is a Type 27 as well. Big difference is it's only 575 CCA.

I'm wanting to run the batteries in parallel for additional capacity when we're off grid in the mountains. I know that you have to use similar battery types (AGM with AGM, Gel with Gel, etc.), and as mentioned both are Type 27, but does the difference in CCA cause an issue? Am I going to deal with parasitic draw if I chain them?

no, the CCA difference won't create an issue. CCA is simply the output capability. Time to charge will differ given one battery is 'bigger' than the other but it's still not an issue.

The charge time difference will cause the converter on the rv to overcharge the smaller battery if they are in parallel.

This has me thinking...

I only plan on running in parallel during discharge. When the RV is not in use, batteries get pulled and will go on tenders individually. Is the mismatch still an issue on discharge? We don't have power at my storage location, and I'm not leaving the batteries out there.

ETA: Disregard...I reread WTR's note above about the difference in charging AND discharging. I think I'll go the switch route.

Thanks to everyone for the info!

I'm pretty much in that spot where I have two batteries, one new and one 6 months old, that I would hate to just get rid of. My goal would be to get as much life out of the two I have before they die, and then replace them with Odyssey batteries.

Just thinking out loud here, but could I use the the battery selector switch jason812 mentioned above and run one battery at a time (1 or 2 on the switch) and then when I replace the batteries, run them in parallel (1 and 2 on the switch)? I pull the battery when we store the RV, and keep it on a Noco Genie tender. I could just do the same with both batteries so I'm not charging both at the same time in parallel. Thoughts?

I do have a solar panel, but it's a weak 13W briefcase panel I picked up at Harbor Freight, just as a small supplemental charger. I don't expect too much out of it.

I know we have some RVers on the forum, so I wanted to see if I could possibly glean some knowledge from y'all.

I just traded in our 2011 23' TT for an 18' Off-Road TT, and I'm setting it up for boondock camping. I was able to keep my battery from the old RV, and it's a 8 month old Type 27 1000 CCA Marine Battery from Duralast. The new RV came with some brand I haven't heard of, but it is a Type 27 as well. Big difference is it's only 575 CCA.

I'm wanting to run the batteries in parallel for additional capacity when we're off grid in the mountains. I know that you have to use similar battery types (AGM with AGM, Gel with Gel, etc.), and as mentioned both are Type 27, but does the difference in CCA cause an issue? Am I going to deal with parasitic draw if I chain them?