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Topic: House battery voltage (Read 490 times) previous topic - next topic

House battery voltage

Freedom ( original) Inverter on no load. Heart interface link 2000 says 12.20V, voltage at all 3 house battery is 12.50. Plug in meter at dash 12.20 So I'm at a loss here! What's up with the discrepancy in voltage. The system is as installed when new. Help
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: House battery voltage

Reply #1 –
Voltage drop due to length of wire from your batteries to your dash?

My aftermarket dash volt meters always read slightly lower than the battery meters in the bedroom (Magnum control panel and solar controller panel).

1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: House battery voltage

Reply #2 –
Quote from: Chuck & Jeannie –
Voltage drop due to length of wire from your batteries to your dash?

Also, number of connections, which length and gauge of wire run add to resistance.

And is worse as amp draw goes up.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: House battery voltage

Reply #3 –
How are you getting the 12.50 voltage of the 3 house batteries?  With a hand held volt meter?  If so, I would get another one and see what it comes up with.  I have had some volt meters that have been that far off before.
2014 ih45  (4th Foretravel owned)
 1997 36' U295 Sold in 2020, owned for 19 years
  U240 36' Sold to insurance company after melting in garage fire
    33' Foretravel on Dodge Chassis  Sold very long time ago

Re: House battery voltage

Reply #4 –
What is the battery voltage with the inverter off. No load on the batteries.
How old are the batteries?
Is the reading at the dash different than it used to be?
John Duld
1995 U320C SE 40'

Re: House battery voltage

Reply #5 –
Reply #3 using a fluke meter, and a cheap tool box special. When he charger is on both the link and the battery voltage is the same.  Reply # 4 I don't know if anything has changed. This investigation started, as I was see if the charger could be set to the parameters of the lithium battery's I'm looking at. It looks like a gel fast charge setting 2 might work. But if I'm not getting an accurate reading from the link, I can't  trust it to charge the batteries properly. I have checked all the connections on the heavy cabling that is connected to the batteries and the shunt all is tight. I hav a new link 2000 I'm going to install the next day or two.
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: House battery voltage

Reply #6 –
Changed out the link 2000, reset all the settings. All seem better. Voltage at the link is closer to the readings at the batteries.  However the unit I installed is an older link , only has 2 charge parameters flooded , and gel type. Working through getting the charge settings worked out. Does anyone know if there are any places that rebuild there old link 2000s
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country

Re: House battery voltage

Reply #7 –
Can you set charge parameters via dip switches on the unit itself?
1998 36 foot U270 Build No. 5328 WTFE, 900 watts solar, Victron controller, B2B, bat monitor, 600 AMPH lithium with 2018 Chevy Colorado toad, SKP #110239, Motorcade #17781, 2021 Escape 17B for when Coach is broken down and campsites are too small, retired and full-timer since Dec. 2020. Part of RV family since 1963.
 

Re: House battery voltage

Reply #8 –
Quote from: Realmccoy –
Can you set charge parameters via dip switches on the unit itself?
going to look into that today
Bruce, Linda, and Macy
Zoey RIP 1/20/19
1999 U295 40' build #5400
2017 silver Jeep Wrangler, 1260 watts of solar on top
Moving around the country