Charger current dropped to half. What is going on?

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WarIsOver   10 µW

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Charger current dropped to half. What is going on?

Post by WarIsOver » Jan 05 2018 10:28am

Hi

I have a home built battery, a Chinese 14S BMS and a Chinese 58.8V/7.5A charger. I recently had to resolder the charger connector wires because one of them detached. And then another.

Now I noticed that the charging seems to take unusually long time and checked (from BMS through Bluetooth) that the charging current is exactly 3.5A. I don't know if this is related to resoldering and I have no good idea what might be going on. Is the charger going bad?

WarIsOver   10 µW

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Re: Charger current dropped to half. What is going on?

Post by WarIsOver » Jan 06 2018 11:49am

Okay, I got a hint that the reason could be a bad transistor. I checked the charger output and saw 61 Vdc / 131 Vac. Need to investigate further...

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Icewrench   10 kW

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Re: Charger current dropped to half. What is going on?

Post by Icewrench » Jan 06 2018 1:25pm

This thread has plenty of information on chargers.
Thanks to dnmun
https://endless-sphere.com/forums/viewt ... 93#p835293

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amberwolf   100 GW

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Re: Charger current dropped to half. What is going on?

Post by amberwolf » Jan 06 2018 1:46pm

If you're getting AC (especially high voltage) on the output of the charger, there's something seriously wrong with it, and I would not connect it to any battery you want to keep.

WarIsOver   10 µW

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Re: Charger current dropped to half. What is going on?

Post by WarIsOver » Jan 06 2018 7:18pm

Nevermind, I blew it up already while "investigating". :twisted:

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