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10-15-2024, 08:24 PM
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#1
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Established Member
Join Date: Jan 2023
Location: Liberty
Posts: 10
M.O.C. #32279
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voltage lithium batteries
What should the voltage read for a pair of lithium batteries. I just had a pair installed by dealership today and voltage is showing 13.2
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10-15-2024, 09:59 PM
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#2
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Established Member
Join Date: Oct 2022
Location: Great Falls
Posts: 13
M.O.C. #31820
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Do you have the Manufacturer or Model info on the batteries? The data sheet or manual should give the voltage to capacity table. A very "general" guess would 70-75% @ 13.2 volts.
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10-15-2024, 10:33 PM
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#3
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Site Team
Join Date: Sep 2017
Location: Oro Valley
Posts: 4,138
M.O.C. #20477
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Lithium batteries maintain a fairly flat voltage and it is not as clear of a SOC indicator as with a lead acid battery. Would recommend adding a battery monitor if the batteries do not have a bluetooth BMS indication.
https://solarshouse.com/wp-content/u...-1536x1536.png
__________________
Zack and Donna plus Millie and Ranger
2018 3160RL
"Life is too short to stay indoors, enjoy the ride!"
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10-16-2024, 01:58 PM
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#4
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Montana Master
Join Date: Oct 2004
Location: Salem
Posts: 7,731
M.O.C. #2283
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While they are on a charger the voltage should be 14.3 or 14.4. 13.3 isn’t fully charged even if they aren’t on a charger.
Lynwood
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10-16-2024, 05:44 PM
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#5
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,745
M.O.C. #30417
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Quote:
Originally Posted by LadyBeeRanch
What should the voltage read for a pair of lithium batteries. I just had a pair installed by dealership today and voltage is showing 13.2
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Did they set the converter charger to lithium mode?
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, 720 watts Solar, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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10-16-2024, 05:46 PM
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#6
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,960
M.O.C. #24086
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% charge with voltage at rest (30 minutes after disconnected) depends on the manufacturer.
Many are similar but it is best to check their website for a chart.
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11-27-2024, 05:28 AM
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#7
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Established Member
Join Date: Nov 2021
Location: St. Augustine
Posts: 14
M.O.C. #30127
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I installed 2-100AH lithium batteries in parallel, moved the switch to LI, but it doesn’t appear that they are charging! I have a Bluetooth battery monitor installed so after installing the voltage was 13.1 - however this morning the read 12.8 - any suggestions?
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Larry & Jackie
St. Augustine, FL
2022 High Country 331RL
2019 GMC 3500 SRW
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11-27-2024, 11:09 AM
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#8
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Montana Master
Join Date: Jan 2022
Location: Shingle Springs
Posts: 2,745
M.O.C. #30417
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Quote:
Originally Posted by Seaulayter
I installed 2-100AH lithium batteries in parallel, moved the switch to LI, but it doesn’t appear that they are charging! I have a Bluetooth battery monitor installed so after installing the voltage was 13.1 - however this morning the read 12.8 - any suggestions?
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What brand batteries. They should have a built in BMS that allows you to turn off the charge and discharge function. Check for a bluethooth app. Also what is the temp where you're at? If below freezing and the battery temp hits 32 degrees they will not charge unless they have built in heaters.
__________________
Tony & Donna & the best dog ever, Murphy.
2022 Montana HC, 295RL, 720 watts Solar, Onan 3600 LPG, 2K inverter, 200AH Lithium. 2020 GMC Denali 2500 6.6 Duramax, Demco 21K Auto Slide
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11-27-2024, 12:59 PM
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#9
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,839
M.O.C. #4831
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Is the Disconnect Switch OFF (i.e the big Red Key can be removed)?
What voltage are you measuring at the battery terminals using a VOM? It should be what you measure at the converter output contacts. Somewhere north of 13.4V.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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11-28-2024, 08:38 AM
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#10
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Established Member
Join Date: Nov 2021
Location: St. Augustine
Posts: 14
M.O.C. #30127
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Sorry Dummy me turned the Converter off when I was installing the new batteries - flipped the breaker back on and ALL is good - thanks for the timely responses !!!
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