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John Deere Tractors Discussion Forum
:

24 V electric start diesels

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55 50 Ron

05-21-2020 08:54:42




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Has anyone ever measured the individual voltages across the 6 volt batteries. I just put 4 new batteries in a friend's tractor and measured individually across each battery. The overall charge voltage is right at 28 volts. The individual battery voltages average 7 volts with a slight variance of each other. That seems good to me and I was curious of data anyone else might have. Thanks




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John T

05-21-2020 14:50:52




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 Re: 24 V electric start diesels in reply to 55 50 Ron, 05-21-2020 08:54:42  
Ron if full charged stabilized and at rest Id expect each battery to measure close to 6.3 volts and all four in series around 25.2 volts and therefore 28 is a good voltage for all four under charge. I think you're good to go.

John T



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Pete in MD

05-21-2020 13:30:48




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 Re: 24 V electric start diesels in reply to 55 50 Ron, 05-21-2020 08:54:42  
Have you used the batteries to start the engine? After you start it I suspect the voltage will drop back to 6.3-6.4 volts on each battery.



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55 50 Ron

05-21-2020 14:23:11




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 Re: 24 V electric start diesels in reply to Pete in MD, 05-21-2020 13:30:48  
I did use the new batteries to start the engine. The measurements I made were with the engine running - I didn't make that clear. I didn't measure after stopping the engine.



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Pete in MD

05-21-2020 17:27:07




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 Re: 24 V electric start diesels in reply to 55 50 Ron, 05-21-2020 14:23:11  
Good. That means you tested your generator output. Like John T said, you're good to go.



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WTW

05-21-2020 11:28:28




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 Re: 24 V electric start diesels in reply to 55 50 Ron, 05-21-2020 08:54:42  
Ron, Your numbers are good. Charge rate is normal / good. Voltage could vary when measuring directly off individual battery due to individual battery state / condition / differences but will maintain charge with 7 volts. DW



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Mike M

05-21-2020 10:49:59




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 Re: 24 V electric start diesels in reply to 55 50 Ron, 05-21-2020 08:54:42  
That makes sense. 7 x 4 is 28 I never use 4 of the 6 volts batteries as I don't think the 6 volt batteries last as long as 12 volt ones and the 6 v always seem to leak acid. But maybe I should as 2 x 13 is only 26 so I bet I'm running less overall voltage ? I never thought of it this way before. This reminds me one of these days I need to round up 2 12v batteries from some other equipment and get my tractor out and run it some.

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buickanddeere

05-21-2020 08:57:54




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 Re: 24 V electric start diesels in reply to 55 50 Ron, 05-21-2020 08:54:42  
Depending on the acid concentration, battery age, battery compensation and state of charge . 12.6V to 12.7V is normal on a fully charged flooded lead acid "12V" battery. What is critical is the battery voltage while cranking .



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