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Old 04-14-2016, 12:24 AM   #1
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Any opinions on battery life, etc...

First time rv owner, literally building this up and heading out for our first adventure. I've been reading the net and here a lot, and decided on two 6v golf cart batteries 225 amp hrs each, one 225 12 v battery, after setting it up in series. So after hooking them up and metering them I got 11.7 volts... Weird. More online searches only to realize they were "dead" from the store, or uncharged... Off to the store and bought a Noco g7200 charger, and charged them for 29 hrs. The Noco said they were charged. So tonight I hooked it all up to my 1000watt inverter to see if I could back feed the whole 5w from the inverter. Before I started my meter showed 12.8v on the two batteries (together) but the inverter only read 12.6. Anyway, turned on lights, the TV, did, and then the furnace... All ran well, and I was monitoring the power drop using my multimeter about every half hour... After about an hour and half, it was reading around 12.25v. I re attached the Noco charger and it seemed to indicate it was at about 50%. My question is, can I expect a 50% drop after only two hours, with a 150watt draw (only when the furnace kicked on), 70-80 watts w led lights and TV/dvd, and converter circuit on. (Before you start into me about having the converter on, the golf carts batteries are NOT tied to the converter for charging... I use the Noco to charge them on shore power only. Path is golf cart batt, fuse, breaker, inverter, 15/30/50 amp cord to 110 panel powering outlets and converter circuit, which runs 12v and charges single 12v battery. Are my batteries toast from not being charged from the store.. They are freakin heavy, so I'd rather not uninstall them if I don't have to..Also all the cables are stone cold to the touch after running 2 hrs size is #1, made the black cables myself with welder ends and using PpC entertainment grade feeder cable. I use it for my sound and lighting rental company rated for 100 amp a/c use.. . Click image for larger version

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Old 04-14-2016, 12:57 AM   #2
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1. Lead acid batteries require some cycling before they produce full power.

2. If you are testing the voltage with the loads on, you will not get a correct State of Charge voltage. Proper SoC testing is with all loads disconnected for at least 6 hours.

LINK to info:

http://www.trojanbattery.com/Battery...e/Testing.aspx

The G7200 is a great charger, but very small for fully recharging a large capacity bank like yours. In maximum "bulk" charging mode it can only supply 72 AH in 10 hours, and will put out much less than that when it switches to "Absorption" mode.

Try a few more 24 hour charge cycles - with off cycles of about 6 hours - and retest.
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Old 04-14-2016, 02:00 AM   #3
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Was your 11.7v reading with no load (preferably no load or charge for the previous 24 hours)? If so, 11.7 volts is well below 0% state of charge, and this is not good on batteries. Going below 50% SoC can adversely effect a batteries usable capacity for the remainder of its life. I would be pulling those batteries out for exchange...or better yet return, and then buy replacements from a store that takes proper care of their inventory.
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Old 04-14-2016, 07:45 AM   #4
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Any opinions on battery life, etc...

11.7 was the first reading I took after joining the batteries in series to see if I actually had them hooked correctly, so yeah- new from the store, reading 11.7 volts. I'm going to take my trip, I'm only dry camping for two days, so hoping that some cycling and use, that they might bounce back... If they don't I have a year warranty on them, and I've already spoken with the manager of the store about the issue, so he is aware they potentially might be back if they do not perform well. Also I was metering them, during their use.. I didn't realize they need to be at rest for a true reading after 6hrs minimum. How do these battery monitors work then, or are they just gadgets? I'm not really concerned if I pooch these batteries on this trip, cause I'm lined up for replacements if they suck, but I'm just concerned about having enough juice over the two night to get to where we're going. Thanks for the replies.
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Old 04-14-2016, 07:53 AM   #5
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SInce you have a commitment to get them replaced, no worry. If they read 11.7 when "new" they were already totally discharged when you got them. Leaving a lead acid battery totally discharged for a significant amount of time will permanently harm them. Yours charged back to the 100% voltage and then dropped to 12.2 after a mild discharge. That is what damaged flooded cells do. They get charged but cannot supply much current without again being totally discharged. Sounds like what you have seen.

Battery monitors do not really use the measured voltage, they count amps in and amps out and give you state of charge by netting out current in and out. An occasional hydrometer measurement will give you SOC at any time. Voltage only means anything when they have been resting for 4 hours or more.

But 11.7 when new is a very bad sign.
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Old 04-14-2016, 08:56 AM   #6
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I brought 4 from Sam's one time and two were dead when I tried to charge them at home, they were about $85 bucks. I felt bad about taking brand new batteries back until I saw all the new batteries that had been brought back. They said at least 25% had been brought back.


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Old 04-14-2016, 09:12 AM   #7
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There is a desulfurization mode on my battery charger that I might try as a last resort, once I get in place on our trip... It sounds like it "might" repair the mode it's been sitting in, but I defer to your expertise
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Old 04-14-2016, 09:36 AM   #8
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There is a desulfurization mode on my battery charger that I might try as a last resort, once I get in place on our trip... It sounds like it "might" repair the mode it's been sitting in, but I defer to your expertise
I agree with Spock, you paid for new batteries, you should get new batteries! Mess with them on your trip but the last thing I would want is to pay good money and start with damaged batteries. Desulfation is possible to some extent, but based on your data, they are pretty bad. Desulfate your own mistakes, not your retailer's.
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Old 04-14-2016, 01:18 PM   #9
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You might also check the date codes on the batteries, just see how old they are.
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Old 04-14-2016, 01:58 PM   #10
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1. You need to wait 24 hours NOT 6 to properly test voltage on a DISCONNECTED battery. (Simply remove the negative wire for 24 hours).
2. Your charger is WAY undersized and you should have something at least around 40 amps in a 4 stage charger to put a proper full charge on.
3. Suggest you get a hydrometer to test your batteries as they were abused before being installed and you need direct cell to cell specific gravity readings to understand the true condition of both batteries.

Reading of 1.275 - 1.280 = fully charged...but look for differences between cells. Do it AFTER topping up with distilled water AND after fully charging to allow the water to mix. Any 50 point reading difference between cells is cause for concern. (i.e. 1.225 vs. 1.275)
FYI...50% is 1.190...and in use...this is your recharge point.
3. Also ...after running a bunch of stuff in the RV...your ACTUAL battery state of charge electrically will be UNDERSTATED and it will take some hours disconnected (like 24 again!) to get a totally accurate state of charge from a voltmeter. This is why those who plan on boondocking REALLY need to invest in a TRUE battery monitor like the Trimetrics or the Victrons that will tell you ALL you need to know about your batteries and your charging at any moment in time...Lots of discussions here on them...just use search.

Good luck with your first trip!
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