Volt meter reading vs Alltrax monitor reading

[JohnnieB]

Originally Posted by Joelwdryden

What should the 36v pack read at 100 percent charged after sitting 10 hours?

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Depends on the brand of batteries, age of batteries and some other factors.

The charts are based on the average voltages of several tests of well broken in batteries. New batteries will read a bit higher, old batteries will read a bit lower.

For Trojan brand, 38.2V is 100% SoC.
For US Battery brand, 38.5V is 100% SoC.

Other brands may fall between those two, but there are a lot of Trojan clones out there.

[Joelwdryden]

Originally Posted by JohnnieB

Depends on the brand of batteries, age of batteries and some other factors.

The charts are based on the average voltages of several tests of well broken in batteries. New batteries will read a bit higher, old batteries will read a bit lower.

For Trojan brand, 38.2V is 100% SoC.
For US Battery brand, 38.5V is 100% SoC.

Other brands may fall between those two, but there are a lot of Trojan clones out there.

Ok thanks. My batteries are us batteries, I'm getting up to around 38.0 on full charge but i don't think they're lasting as long. I know the batteries are getting up there in age. Any tips on guessing when replacement will be needed.

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[JohnnieB]

Originally Posted by Joelwdryden

Ok thanks. My batteries are us batteries, I'm getting up to around 38.0 on full charge but i don't think they're lasting as long. I know the batteries are getting up there in age. Any tips on guessing when replacement will be needed.

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What battery charger are you using?

Unless it is has a charging profile for US Battery, your batteries have been chronically undercharged, shortening their lifespan. Fortunately, you can recover some the the loss with proper charging.

[Joelwdryden]

Originally Posted by JohnnieB

What battery charger are you using?

Unless it is has a charging profile for US Battery, your batteries have been chronically undercharged, shortening their lifespan. Fortunately, you can recover some the the loss with proper charging.

Powerwise II.

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[JohnnieB]

Originally Posted by Joelwdryden

Powerwise II.

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A PW-II is designed for Trojan brand batteries.

[Joelwdryden]

Originally Posted by JohnnieB

A PW-II is designed for Trojan brand batteries.

Ok, well, i take it there's no way to get it to charge to a higher level? It's not worth buying a different charger, as I'm currently in the process of acquiring lithium cells to build a battery, but my main question is when your batteries are nearing the end of their usable life what voltmeter readings confirm they're getting bad. Will they not get to as high a voltage initially, or not hold charge as long, or what should i be monitoring. I'm just wondering if i can make it another season while building my lithium pack

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[JohnnieB]

Try some back-to-back charging.

That is initiating a new charge on already charged batteries.

Also, what is the pack voltage when charger shuts off?
If it is 45V or more, you might get some more life out of the batteries.