|
04-28-2019, 06:20 PM
|
#1
|
Rivet Master
1971 25' Tradewind
1993 34' Excella
Currently Looking...
Estancia
, New Mexico
Join Date: Feb 2005
Posts: 7,742
|
Mixing battery sizes
My 93 has 2 battery trays up front. They will fit a series 27 but PO put in 2 wet cell series 24s. One of the 24s needed to be replaced so I put in a new 27 marine batt. The other 24 is still good. Other than the reduced amp hours on the remaining 24 is there a downside to having one series 24 and one series 27?
__________________
Sail on silver girl. Sail on by. Your time has come to shine.
|
|
|
04-28-2019, 06:26 PM
|
#2
|
Rivet Master
2007 22' International CCD
Corona
, California
Join Date: Jul 2013
Posts: 9,180
|
Are the batteries in parallel? If so, the ‘new’ one may try to swap current with the ‘old’ one and therefore mess up the new battery.
Parallel 12 volt batteries should be replaced in pairs, same size, same brand, same date code to get best battery life.
Frankly I’m not a fan of paralleled battery setups...
__________________
Rich, KE4GNK/AE, Overkill Engineering Dept.
'The Silver HamShack' ('07 International 22FB CCD 75th Anniversary)
Multiple Yaesu Ham Radios inside and many antennae sprouting from roof, ProPride hitch, Prodigy P2 controller.
2012 shortbed CrewMax 4x4 Toyota Tacoma TV with more antennae on it.
|
|
|
04-28-2019, 10:43 PM
|
#3
|
Site Team
2017 30' International
Broomfield
, Colorado
Join Date: Apr 2009
Posts: 3,555
|
Different voltage curves on those batteries means your 27 will always be working harder than your 24. Stick with the same size and same age.
|
|
|
04-29-2019, 06:28 AM
|
#4
|
Rivet Master
2021 33FB Classic
2019 30' Flying Cloud
Katy
, Texas
Join Date: Apr 2017
Posts: 788
|
It is possible to do it, but only if you are prepared for some advanced battery analytics and ready to do some “active” battery management. Most folks don’t have the knowledge and skills for this complexity. With mismatched batteries in parallel, you will wear out one or both batteries extremely quickly, and you risk running the weaker battery into “reversal”...which is a really good way to have a chemical and energy “unplanned release”.
__________________
2021 Classic 33
2020 GMC 3500HD Duramax AT4
ProPride 3P
|
|
|
04-29-2019, 06:41 AM
|
#5
|
Half a Rivet Short
2017 30' Classic
2022 Interstate 24X
Carlisle
, Pennsylvania
Join Date: May 2017
Posts: 15,684
|
Hi
Simple answer is that compared to a lot of things, basic batteries are cheap. You are better off with a pair of "what's on sale today" than a really good new one parallel with a worn out old one. Indeed, a new pair of good batteries will cost more. The decision of "are they worth it" is very much a "that depends" sort of thing.
Bob
|
|
|
04-29-2019, 07:54 AM
|
#6
|
3 Rivet Member
1986 25' Sovereign
Allegan
, Michigan
Join Date: Oct 2005
Posts: 146
|
Lumatic,
One thing you may wish to consider is a 4 position battery isolation switch. It allows you to select either battery separately, both together or neither (for storage). I got mine from West Marine; boaters like to make sure they have one good battery bank. When hooked up to shore power you can have the converter charge both batteries in parallel. While traveling or off the grid I select one battery and run it until it gets to about 12 volts.
Then it is time to switch and plan on my next full service campground.
We can usually go a few days on one battery - more if we are careful. (We don't have an inverter to run 120 volt devices and have converted to LED lighting.) Two mismatched batteries would not be a problem since they never really "see" each other.
Lots of information and advice out there - see what makes sense to you for the way you like to camp.
Good luck,
Whit Nash
|
|
|
04-29-2019, 09:10 AM
|
#7
|
Rivet Master
1958 18' "Footer"
Idyllwild
, California
Join Date: Aug 2006
Posts: 645
|
Not a good idea.
You should always change all batteries in a bank at the same time anyway. Put another 27 of the same type and forget it for a few years (3-5 for Flooded Lead Acid)
|
|
|
05-06-2019, 07:33 PM
|
#8
|
Rivet Master
2022 25' Flying Cloud
NCR
, Ontario
Join Date: Feb 2017
Posts: 3,085
|
that is not a good idea. mix and match will cause no end of problems. as well using the same battery , but of different ages will cause you issues.
like CAR Tires, get then all at the same time and type. replace 1 replace them all
|
|
|
05-07-2019, 07:03 AM
|
#9
|
Rivet Master
2014 20' Flying Cloud
Sag Harbor
, New York
Join Date: Jun 2015
Posts: 17,523
|
Quote:
Originally Posted by Lumatic
My 93 has 2 battery trays up front. They will fit a series 27 but PO put in 2 wet cell series 24s. One of the 24s needed to be replaced so I put in a new 27 marine batt. The other 24 is still good. Other than the reduced amp hours on the remaining 24 is there a downside to having one series 24 and one series 27?
|
Joining the chorus of "not recommended."
|
|
|
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|