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Old 10-21-2015, 12:46 PM   #91
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I believe Tom is right about the voltage of a fully charged set. I was curious so I checked my (2) 6v batterys that I fully charged 5 days ago and they read 12.81v. This was checkrd with a $400 Extech meter, so I know it is accurate.
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Old 10-21-2015, 01:53 PM   #92
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I would suggest you still have some surface charge. There is not ONE battery mfr. who sez wet cells are 100% at 12.8+
I don't doubt your measurements.
Trojan 12.73V
Deka 12.6V
Interstate 12.66V

Easiest way to get an actual state of charge is a hydrometer. (1.265=100%) if you don't want to invest in a true monitor. But ya have to check each cell.
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Old 10-21-2015, 04:07 PM   #93
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OK, thanks. It is good to see that my 4 yr old 6 volters are still in really good condition that they are holding a surface charge for this long.
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Old 10-25-2015, 08:40 AM   #94
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A brief update. We installed the new battery. I drained the old battery down to the charge level of the new battery and connected the jumper cables. After a couple of hours of waiting to see if any worst case scenarios that could result from two batteries of different age being linked happened, I checked the charge again and found that they were now equal and that there was no excessive heat or other indication that things were not going well. At that point we connected the trailer positive and ground cables and we were back in business.


The two batteries seem to be playing well together. It's been four days now and I've checked the charge daily. The charge is dropping as expected from the load from the background trailer systems and occasional use of lights, etc. but at roughly half the rate than before the second battery was added.


The verdict. So far so good.


Next step will be to buy one of those Trimetic monitors so I can stop having to take the lids off the battery boxes each morning then onto planning a solar system that will meet our needs for the big trip we're planning on when we sell the house.


Thanks to all of you for your input. You've all been very kind to a couple of thick headed newbies.
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Old 10-25-2015, 02:03 PM   #95
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Good to hear everything is working for you.
If you don't want to spent big money on a Trimetric monitor get one of the these.

http://goo.gl/BJx3aS

A lot cheaper and works like a charm.
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Old 10-25-2015, 05:49 PM   #96
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That monitor does NOT measure state of charge on the battery system, amp hours used by the coach, CURRENT use of amps by the coach. It cannot do so because there is no shunt from the battery and it is not designed to do so.
It is fine for monitoring a solar panel(s) and what is happening with it but not the in/out net to the entire system or resulting battery bank SOC. You get what you pay for and if you plan to boondock ...you need a real monitor that takes account of everything IMO.
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Old 10-25-2015, 06:27 PM   #97
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That's all I ever do is boondock.
It does tell me the real time SOC, real time amps being used and real time % of capacity.
Works just fine for me.
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Old 10-25-2015, 06:43 PM   #98
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If there are any negative wires attached to your batteries that do NOT attach to your monitor...and ONLY your monitor attaches to your batteies...then what you think you are getting is NOT what you're getting. Given the size of the screws on the monitor...I can guarantee that you are not monitoring what I said in the post above.
You cannot possibly be measuring true state of charge... you cannot possible be measuring true amps being used. You cannot tell how much longer your can run off your batteries before needing a charge and you cannot tell when they are Full during charging. Sorry...but enjoy your readouts if you like em...the Trimetric will pay for itself.
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Old 10-25-2015, 07:58 PM   #99
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It does tells me the voltage and amperage that the solar panels are producing.
No it doesn't tell me present amps being used or the SOC or % of capacity while the batterys are being charged. It does tell me that stuff when the batterys are not being charged, when I de-activate the cutoff switch for the solar panels.
It gives me all the info I need while boondocking.
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Old 10-25-2015, 08:49 PM   #100
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Voltage, current, and temperature all affect SOC. If voltage is related to battery state of charge, you have to compensate for voltage variation due to current movement through the battery not just when a battery is at rest.
That is great your setup is working for you, you understand your usage and capacity.
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