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Old 01-25-2016, 04:31 PM   #1
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How low let Volts go ?

How low do you let batteries go down before firing up generator to recharge?
I don't have solar panels.
Just got home from dry camping at Provincial Park and they have limited generator hours 9-11am and 6-8 pm.
After a day running lights, furnace,tv etc had 11.8 V ran my eu2000 for an hour and charged back to 12.4 .
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Old 01-25-2016, 04:43 PM   #2
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This ought to help with your question
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Old 01-25-2016, 04:44 PM   #3
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It's best not to go below 12.06 volts. Thats 50% capacity.

Bringing them up to 12.4 is about 80% charge.

Using them from 50% to 80% is ok for wet cell batteries. The re-charge slows down, once over 80% and the noise and cost outweighs the benefit.

If you can keep them in that range they will give you good service, otherwise add batteries or charging time.

Just remember to charge them to 100% before you store them. Storing them in a low state for weeks or more is a real killer for batteries.
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Old 01-25-2016, 04:44 PM   #4
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According to charts the magic number is about 12.1 VDC.

And House batteries are not fully charged until they Float at about 13.4 VDC

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Old 01-25-2016, 04:46 PM   #5
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While the chart does not show it, discharging below 50% shortens the life of a deep cycle battery.


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Old 01-25-2016, 04:55 PM   #6
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Bookmark these two web pages for some excellent information that will help you understand 12 VDC battery systems among other stuff too.

The 12volt Side of Life (Part 1)

The 12volt Side of Life Part 2

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Old 01-25-2016, 05:11 PM   #7
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Thanks for those links. Very good info.
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Old 01-25-2016, 05:49 PM   #8
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One more link showing the 3 stages of charging.

https://www.batterystuff.com/blog/3-...-chargers.html
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Old 01-25-2016, 05:51 PM   #9
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Use as a minimum 12.0 vdc. Easy to remember. (-:
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Old 01-26-2016, 11:34 AM   #10
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Another thing to remember is that the chart is resting voltage where the battery is off line for a period. 24 hours after disconnect or charge is best time to measure. When hooked up with some load, the battery voltage will read lower, like wise after charging there will be a surface charge higher than actual battery voltage.
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Old 01-26-2016, 11:40 AM   #11
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Quote:
Originally Posted by GBRG07 View Post
How low do you let batteries go down before firing up generator to recharge?
I don't have solar panels.
Just got home from dry camping at Provincial Park and they have limited generator hours 9-11am and 6-8 pm.
After a day running lights, furnace,tv etc had 11.8 V ran my eu2000 for an hour and charged back to 12.4 .
GBRG07
Like vsheetz my minimum is 12V.
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Old 02-02-2016, 06:42 AM   #12
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I've heard 12.06 or 12.1 for 12 volt RV batteries and 11.9 for Deep Cycle 6 volt batteries.
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Old 02-02-2016, 07:29 AM   #13
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I see the chart above has been posted. So I won't re-post

How low depends on the batteries.. GC-2 Pairs (Six Volt Golf Car batteries) are TRUE DEEP CYCLE and thus do not object overly to disvcarge levels as low as 50% (12.06 volts) In fact I'd say 12 volts is safe. But when it drops to 11 it's time to be charging (I have OOPSED to 10 or even 9 a few times and they recovered, but it cost me life).

For MARINE/deep cycle batteries (most one piece 12 volt types) I'd go with 70% point on the chart.. 60% might be safe but I'd try for the 70% or even 80% as the low point cut off.. This is one of the reasons I'm so fond of GC-2. (the other is cost per watt of storage).

OH, and you will notice I said GC-2 Pairs..
Each GC-2 is a six volt battery, when it's on the shelf, or when you are lugging it around by hand.. But when properly installed in an RV it becomes 1/2 of a single 12 volt battery.. RV's only have 12 volt batteries for the house. There are no six volt house batteries.. Just 12 volt batteries in 2 pieces (Six volts each)...

Though that may be confusing this shoudl explain it.

Think of each pair of six volt batteries as a single 12 volt 4D.

Now: Here are some common questions and reply questions

Can I replace just one of the six volt? Can you replace just half of a 12 volt battery?
Can one be older and one newer/// How woudl you like a 12 volt battery where 3 cells were brand new and 3 were 5 years old?

How do I charge them ... Charge IT (The 12 volt battery).

Do they have to be the same size (GC-2's come in several capaciteis) Would you like a 12 volt that was half G-24 and half G-29?

See how questions simply answer themselves when you think of the pair as a single battery?

But again, I'd keep DEEP CYCLE over 12 volt and MARINE/deep cycle over 12.3
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Old 02-14-2016, 03:08 PM   #14
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One thing not brought up is that to have a valid voltage reading there needs to be no current going into or coming out for some hours, (memory says 4, but...).
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