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Old 11-18-2022, 09:52 AM   #1
DaveTM
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Default ElCon charger ZEVA BMS...and a charging "thing"

When I installed my Leaf pack using a ZEVA BMS 16v2 I purchased an ElCon TC 1800 W charger.

I set the pack charge to 57V and since day 1, the pack would charge up 57.3V before finally shutting down.

Last night was a different story. The pack was up to 57.5V of charging...and the charger was "trickle" charging at about 2amps. So, instead of waiting to see if my HV relay would trip, I just unplugged the charger.

I put in a request to an outfit in California (they did not sell ZEVA's back in 2018 ) and ask if they had any idea what the issue would be.

I'll let ya know. Meanwhile, if you have any thoughts on this I'd appreciate any input.

I was thinking I could reset the max pack charge from 57V to 56V. I do not have the option of setting pack voltages to anything but "round" numbers. In other words I can't set the charger to shutdown at...say 56.8v. I don't have the option of any partial V settings on the charger.
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Old 11-18-2022, 09:57 AM   #2
Volt_Ampere
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

This sounds like a charger issue. Sounds like the output voltage is higher than you have set it at. What is the open circuit voltage?
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Old 11-18-2022, 11:58 AM   #3
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

I’m not quite sure what you’re asking me. If you mean the cell HV relay I think I have it set at 4.1…or mebby 4.15. I can’t check that right now as the cart is on the back of my pickup truck waiting for me to get out a bit later for archery deer.
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Old 11-18-2022, 12:36 PM   #4
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

No. What is the open circuit voltage of the charger when not connected to the battery?
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Old 11-18-2022, 12:43 PM   #5
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

Quote:
Originally Posted by Volt_Ampere View Post
No. What is the open circuit voltage of the charger when not connected to the battery?
I'm sorry but I don't know what you mean. How do I measure this and where do I measure this at?
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Old 11-18-2022, 12:44 PM   #6
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

Measure it on the output of your charger when it's not connected to the battery.
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Old 11-18-2022, 02:30 PM   #7
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

Ok….how do I do that? Disconnect the charger…and hook the MM to the positive & negative & plug in charger?

I thought the charger had to “sense” the pack in order for it to “push” current to the pack?

Remember…I’m not an engineer so you gotta dumb it down.
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Old 11-18-2022, 07:28 PM   #8
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

Never mind…I found how to check my charger with my MM. I’ll do this tomorrow and report the results.

Thanks!
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Old 11-19-2022, 09:57 AM   #9
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

I’m obviously missing something here. I’ve disconnected the charging outputs on the charger, plugged it in and nothing happens except the charger flashes a red, then green, then nothing for 5 seconds, then red, green…and on.

I tried disconnecting the charger from the BMS, but still the same.

So I grabbed my vehicle 12v charger (different charger) and it just gives me the “error code “ light when I touch the MM probes to the terminal clamps.

Again..I thought these chargers had to detect a battery before they began charging.

I’m perplexed at this point.
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Old 11-19-2022, 11:12 AM   #10
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Default Re: ElCon charger ZEVA BMS...and a charging "thing"

Some chargers do have to detect a battery before turning on. My Lithium chargers don't do that though. I can measure the open circuit voltage by turning it on and measuring the leads with my MM. It also displays the voltage on the front.
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