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tbax46

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Posted: 09/22/20 07:48am Link  |  Quote  |  Print  |  Notify Moderator

Two brand new 12v batteries in parallel. The meter on my leveling system shows 12.1 and my handheld tester shows 11.8. Should there be this difference? Have been plugged into 50amp shore power for three days


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Lynnmor

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Posted: 09/22/20 08:06am Link  |  Quote  |  Print  |  Notify Moderator

tbax46 wrote:

Two brand new 12v batteries in parallel. The meter on my leveling system shows 12.1 and my handheld tester shows 11.8. Should there be this difference? Have been plugged into 50amp shore power for three days


What is the voltage at the batteries while plugged in to shore power?





RobWNY

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Posted: 09/22/20 08:26am Link  |  Quote  |  Print  |  Notify Moderator

Are you unplugging shore power, then waiting several hours so the batteries can rest before testing the voltage using both the RV system and handheld meter?


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midnightsadie

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Posted: 09/22/20 08:28am Link  |  Quote  |  Print  |  Notify Moderator

some thing not right new batteries should be over 12.6 ea.

full_mosey

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Posted: 09/22/20 08:43am Link  |  Quote  |  Print  |  Notify Moderator

tbax46 wrote:

Two brand new 12v batteries in parallel. The meter on my leveling system shows 12.1 and my handheld tester shows 11.8. Should there be this difference? Have been plugged into 50amp shore power for three days


You should be reading around 13.6V everywhere after 3 days plugged in. If not, your charging system is either disconnected from the batteries, broken, or not plugged into the 120V system.

Check 12V fuses, the 120V circuit breaker, or a 12V disconnect switch.

HTH;
John

joelc

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Posted: 09/22/20 08:58am Link  |  Quote  |  Print  |  Notify Moderator

It is possible one of the meters is off calibration. But I believe 13.6 is correct with no load. I would bring them back where you purchased and have them check with their meter and do a cell check.

pianotuna

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Posted: 09/22/20 09:29am Link  |  Quote  |  Print  |  Notify Moderator

Some how the converter is not charging the battery bank. Check the voltage output at the converter.


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Posted: 09/22/20 09:55am Link  |  Quote  |  Print  |  Notify Moderator

My 24's never read 13 anything for the 2 years that I have owned them. High 12's maybe when taken off an independent charger but settles in at the low 12's after a day or 2.


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Ed_Gee

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Posted: 09/22/20 10:34am Link  |  Quote  |  Print  |  Notify Moderator

12.1 VDC indicates a battery already at 50% discharge state. Since you have been plugged into shore power for three days, obviously something is preventing your RV charger from charging the batteries. Do you have a Battery Disconnect switch inadvertently activated? If not, you need to diagnose why the charger is not charging the batteries..... You just installed them? I'd also be suspicious that you did not hook up all the battery cables properly.....maybe you missed one? One thing for sure.....get a charger on those new batteries quickly before they get further discharged and ruined!


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Ed_Gee

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Posted: 09/22/20 11:40am Link  |  Quote  |  Print  |  Notify Moderator

tbax46 wrote:

Two brand new 12v batteries in parallel. The meter on my leveling system shows 12.1 and my handheld tester shows 11.8. Should there be this difference? Have been plugged into 50amp shore power for three days


Regarding this voltage reading discrepancy, what are you using for a handheld "tester". Is it a Digital Volt Meter, or something else. Also, are you taking your reading at the battery terminals or somewhere else? If that handheld "tester" has a built in load that it places on the battery when reading the voltage, that could account for the discrepancy in the two readings. ....better off with a DVM in this case. See my other prior post for my assessment of your low battery voltage problem ...

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