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Author Topic: Mid Winter Battery Check  (Read 844 times)

Len and Jo

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  • Posts: 1175
Mid Winter Battery Check
« on: January 05, 2016, 10:45:04 AM »
Went to the storage lot today and checked on the Green TARDIS house battery state of charge.  Have read many comments about wet cell golf cart batteries self discharging (internal discharge).  My less than a year old Interstate house batteries measured 12.75 volts after about 1.5 months in the storage lot.  Considering that the ambient temperature was 20F ish, I add 0.1 volts to that reading (??) and guessimate that the state of charge in in the area of 93% (room temperature 12.85 volt swag).  Was expectioning the house batteries to be more discharged then that.  Will check on them again in mid February.
Len & Jo
The Green Tardis
We 'B' RVing   Berkley, Michigan
Van Development:   https://youtu.be/5Xqk_G6k95M
12 Years of Travels:  https://youtu.be/UMIf17CzdZo

blw2

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  • Posts: 2539
Re: Mid Winter Battery Check
« Reply #1 on: January 05, 2016, 03:27:53 PM »
considering that most sources I've read indicate 5% as an average or typical discharge rate.... I believe I have also seen 3% to 5% mentioned... your measurements seem about right then....
Brad (DW + 3 kids)
13 Thor Chateau 31L Class C on Ford E-450
'06 Silverado
'05 Rockwood Freedom 1910 (5-1/2 years)
former tent campers

Len and Jo

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  • Posts: 1175
Re: Mid Winter Battery Check
« Reply #2 on: April 15, 2016, 10:55:55 AM »
Got the Green Tardis out of the storage lot today.  House batteries on this 70F day are at 12.64 volts.  That is now after 4.5+ months of storage.  Have seen many, many posts about battery winter storage issues and now I wonder why.  Will get the solar panels back on the roof and operating and give the house batteries a top off.  I might also plug the van in and charge the batteries with the Progress Dynamics Interi-Power 9245 for good measure  SPRING HAS SPRUNG!!!!!!!!
Len & Jo
The Green Tardis
We 'B' RVing   Berkley, Michigan
Van Development:   https://youtu.be/5Xqk_G6k95M
12 Years of Travels:  https://youtu.be/UMIf17CzdZo

 

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