24 V electric start diesels

55 50 Ron · May 21, 2020

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

buickanddeere · May 21, 2020

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 .

Mike M · May 21, 2020

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.

WTW · May 21, 2020

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

Pete in MD · May 21, 2020

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.

55 50 Ron · May 21, 2020

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.

John T · May 21, 2020

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

Pete in MD · May 21, 2020

Good. That means you tested your generator output. Like John T said, you're good to go.

24 V electric start diesels

55 50 Ron

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buickanddeere

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Mike M

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WTW

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Pete in MD

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55 50 Ron

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John T

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Pete in MD

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