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2manytoyz

Central FL

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Posted: 07/10/19 07:36am Link  |  Quote  |  Print  |  Notify Moderator

Crabbypatty wrote:

What I find interesting is that on these 6 volt flooded battery threads its not stated how far these batteries are discharged. Yes that's how they are rated by number of full discharge cycles.So im guessing they are drawn down to almost nothing. However what I have found using Trojan T 125s is that if you hold the discharge to no greater than 50% they keep going on and on. Sold my first TT after 10 years with two Trojans T125s, still going. Bought a new to us TT 4 years ago and its a no brainer another two. We just traded up to a fiver and I added two more. So now up to 4 Trojans 125's. I know Ill get 10 plus years out of them. I use the Trimetric 2030rv meter to let me know state of charge and just upgraded to 648 watts of solar. Its a delight not to worry about it.


Heat is a major factor when it comes to battery life. Automotive batteries only last 3-4 years in Florida, despite the brand, cost, or warranty. My garage is currently in the 90s at midnight! Golf cart batteries (4x Trojan T-1275) are the same chemistry, and suffer the same limited life due to heat.

I've been purchasing 6V golf cart batteries for my solar setup since 2006. Gone through several sets. Almost always 4-5 years of use, never longer. I also have a 48V golf cart, and have to replace those batteries every 4-5 years also.

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I water my batteries monthly. I have a battery watering system on the motorhome, golf cart, and had added one to the solar battery bank shortly before moving to AGMs. None have every been as low as 50% SOT (State Of Charge). Typically never below 80%!

I'm using a Xantrex LinkPRO to monitor the SOT of the battery bank.

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Last year, I finally switched over to AGM batteries for the solar setup. They are much more expensive, but are expected to last 8-10 years in this heat.


Robert
Merritt Island, FL
2015 Forest River Georgetown 328TS
2006 Jeep Wrangler Unlimited TOAD
Falcon 2 Towbar, Roadmaster 9400 Even Brake System
http://www.2manytoyz.com/


Gjac

Milford, CT

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Posted: 07/10/19 09:24am Link  |  Quote  |  Print  |  Notify Moderator

As Robert posted heat and degree of discharge are two big factors of the life of a wet cell battery. I live in Ct, much cooler than Fl, have the same batteries that have never been discharged past 50%SOC, and these same batteries have lasted 12 years so far. They sit all winter with no charge and only self discharge about 20 %. I don't hear much discussion about leaving the batteries on a charger vs off the charger until they self discharge to 80% soc then charge fully and how that affects the battery plate life. I would think the plates would be eaten away quicker with a constant charge routine. I realize most batteries die of sulfation first rather than plate reduction so charging is important, but I would think there is a sweet spot between the two, just have not heard it discussed.

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