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Old 09-26-2014, 12:56 PM   #1
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Remaining Charge in Batteries?

Just spent our first night in 2015 Flying Cloud 23FB. Have figured out that the Sea Level II monitor shows VOLTS for the battery (11.9).

We have two 6 volt batteries and are boo docking. How can we tell how much power is left in the batteries?

We are new to this and have no sense of how much we are eating into the battery power. Being very frugal present!
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Old 09-26-2014, 01:53 PM   #2
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Below 12 volts is basically dead. Time to recharge before it gets any lower.
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Old 09-26-2014, 02:15 PM   #3
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The only way to know for sure is with a monitor that measures amp hours instead of just volts. A resting deep cycle battery is at about 50% state of charge at 12.2. Michael is correct that 11.9 is nearly discharged.
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Old 09-26-2014, 02:35 PM   #4
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Buy (or get one free at HF with coupon) an inexpensive digital volt meter and check the individual batteries to see if one or both are fully charged or dead ...
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Old 09-26-2014, 06:01 PM   #5
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Quote:
Originally Posted by FlyinNitwits View Post
Just spent our first night in 2015 Flying Cloud 23FB. Have figured out that the Sea Level II monitor shows VOLTS for the battery (11.9).

We have two 6 volt batteries and are boo docking. How can we tell how much power is left in the batteries?

We are new to this and have no sense of how much we are eating into the battery power. Being very frugal present!
Install a proper battery monitor that actually shows Amps being used. I installed the best one out there the Trimetric TM 2030, and I am amazed as to how little and how much certain electronics use.
They should be standard instead of those idiot monitors they install.
It's like driving a car without a fuel gauge if you don't have one. Unless you are always plugged in.


George
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Old 10-03-2014, 04:17 PM   #6
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Voltage Chart

12 volts is 50% capacity.
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Old 10-03-2014, 04:22 PM   #7
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Thanks for the chart KJRitchie. Yep, when the volt meter says below 12v, time to plug in and charge up.

David
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Old 10-03-2014, 04:40 PM   #8
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Look up your battery manufacturer and type online. They should provide you battery specific information, such as this...

http://www.exide.com/Media/files/Dow...0%205_9_13.pdf

That should tell you EVERYTHING you'd ever want to know about your battery's charge, at least until it ages a little, and the capacity is reduced, then it's all out the window without a set load and data sheet for capacity testing...

-Red, who does a bit of battery testing...
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Old 10-03-2014, 04:43 PM   #9
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So, instead of slogging through all that hoohah, just plug up and charge when it hits 12 volts, like those guys said...

-Red
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Old 10-03-2014, 06:57 PM   #10
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Thanks everyone. Will go with the 12 level limit.

Penny


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2015 Flying Cloud 23 FB / soon to be towed by VW Touareg TDI
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Old 10-04-2014, 11:33 AM   #11
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Hang on now Penny. What batteries did Airstream provide you with? The chart is a guide and there can be a significant difference between 12.0 and 12.2 over time if you plan to do a lot if boondocking. Red could be perfectly correct but many manufactures list their open cell voltage 50% discharge different. Make sure and you might "buy" a year of extra life knowing what they recommend.
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Old 10-04-2014, 01:06 PM   #12
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^^^^^^^^^Good point!^^^^^^^^^
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