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theoldwizard1

SE MI

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Posted: 05/24/20 07:49pm Link  |  Quote  |  Print  |  Notify Moderator

Ramblin' Ralph wrote:

Rarely, if ever, do the batteries go below the 50% charge level.

Dropping below about 80% SOC on any lead acid battery will shorten its life.

Ramblin' Ralph wrote:

Current batteries are Interstate 27DC Marine/RV from Costco. I think at least 2 of my previous sets (which lasted longer) were the Costco branded ones.


Costco now sells Interstate brand. A pair of 6V golf cart batteries will store more energy, last longer and likely cost less than a pair of Marine/RV batteries.

Gjac

Milford, CT

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Posted: 05/24/20 09:14pm Link  |  Quote  |  Print  |  Notify Moderator

I would go with 2 6v golf cart batteries, which should last you longer than the marine batteries. My first set were Trojan 105's they lasted 4 years. My second set were the 6v GC batteries from Sams Club. They are now 13 years old and I dry camp 95% of the time. Sams Club were almost half the price of the Trojan batteries. Having said that what I learned the hard way is maintenance is more important than brand name.

ktmrfs

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Posted: 05/25/20 09:44am Link  |  Quote  |  Print  |  Notify Moderator

On my trailer I bought in 2004, the first set of Trojan T125-s went to our daughters in laws in 2012 and he ran them 3 more years before they started to loose noticeable capacity. I then installed the set I had in my 2010 trailer on the 2004 trailer and they are still doing well.

On the 2010 trailer I then put new Trojan T125-s on in 2012 and they are still doing well.

In both trailers the batteries are very often discharged to 30-40% SOC so they see pretty deep discharges.

On both trailers I have a 3 stage charge controller (PD) and make sure they are fully charged after each trip. (Note the std WFCO charger is NOT a good charger, it will seldom if ever fully charge a set of batteries). Then in storage the batteries are kept charged by solar panels.


2011 Keystone Outback 295RE
2004 14' bikehauler with full living quarters
2015.5 Denali 4x4 CC/SB Duramax/Allison
2004.5 Silverado 4x4 CC/SB Duramax/Allison passed on to our Son!


ktmrfs

Portland, Oregon

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Posted: 05/25/20 09:44am Link  |  Quote  |  Print  |  Notify Moderator

duplicate post, sorry, the darn "page not avaiable error"

ajriding

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Posted: 05/25/20 09:53am Link  |  Quote  |  Print  |  Notify Moderator

I agree with two 6 volt golf cart batteries. This is the easiest route, and on the road you can maybe get a warranty depending where you buy them (lots os Autozones or Advanced Auto or similar all over the nation...).

Golf cart batts are real deep cycle. Marine are not deep cycle!!! Marine batts are wrong for RVs IMHO.

The Golf cart batts have thicker plates so can be discharged more than a marine battery before death. (i think marine can go 200 cycles, and deep batt can go 2,000??, a car starting battery maybe 2)

Benefit of two 6 is that you run them in series so even if one is in bad shape it will not parasitically drain the other one to death.
You can replace one 6 and pair with an old 6volt, but mixing a new and old 12 volt is death for the new one.

Sounds like a good time for this upgrade.

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 05/25/20 01:07pm Link  |  Quote  |  Print  |  Notify Moderator

"Best" route when a microwave oven is not involved

MEXICOWANDERER

las peñas, michoacan, mexico

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Posted: 05/25/20 04:43pm Link  |  Quote  |  Print  |  Notify Moderator

And don't forget about

Top Charging

Part of the reason I get phenomenal battery life [emoticon]

ktmrfs

Portland, Oregon

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Posted: 05/25/20 06:56pm Link  |  Quote  |  Print  |  Notify Moderator

MEXICOWANDERER wrote:

"Best" route when a microwave oven is not involved



exactly. What is great for one application may be a disaster for another. GC advantage is ability for 100's of deep discharges to 25%SOC, excellent life when current draw is limited to say 50A or even 25A or less. Big disadvantage is very high cell resistance = voltage drop on high draw >50-75A and coupled with no ability to load share between batteries when comparing 2 GC to 2 marine 12V jugs.

My past experience is that a pair of GC would run my true inverter panasonic microwave at 500W output as long as battery was at 85% SOC or more. Otherwise the inverter would cut out due to low battery voltage. Others had similar experience. With 4GC I can go down to about 50% SOC.

lane hog

Tucson, AZ & NW Chicago Burbs, IL

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Posted: 05/25/20 11:01pm Link  |  Quote  |  Print  |  Notify Moderator

Ramblin' Ralph wrote:

FAfter full charge from solar, it reaches 12.2v overnight (per new charge controller with history function).

Current batteries are Interstate 27DC Marine/RV from Costco.


You're not hallucinating. I just bought a pair of batteries (4/20 manufacture date) from Costco, and can't get them above 12.5V having tried both my solar+MPPT and a Victor smart charger. I even tried a new PWM controller, and it stayed steady at 12.5V....

These will probably go back to Costco, but I think I'll be taking a trip over to the Interstate battery outlet a mile away from Costco to have them take a look at them.



  • 2005 Winnebago "Minnie" 31C (was a three-time Jayco owner)
  • 2012 MasterTow Dolly pulling a 2003 Jeep Liberty (had Ram 2500 CTD, Dodge Durango, Honda Odyssey...)
  • Onan Microquiet 4000, plus 130W solar and Honda EU2000i twins for backup



Ramblin' Ralph

Central California Coast

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Posted: 05/26/20 10:29am Link  |  Quote  |  Print  |  Notify Moderator

Sounds like GCs are the way to go. However, my truck camper battery compartment won't hold 2. My 2nd 12v is in the truck bed, ahead of the wheel well. If I put the GC there, I would have to rewire for series vs. parallel. Also would have to put the GC on the ground when I take my camper off the truck. To simplify things, I'll just stick with 27DC and hope another brand gives me better luck.

Thanks for the tips.


Ralph
2006 GMC 2500HD, XCab, SB, 6.0L w/2001 Lance 845
Bilstein Shocks, TorkLift Stable Loads, 125 watt solar
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