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Blue Smart IP22 repeated 30amp then 0amps?

My IP22 Blue Smart charger is not working properly. It charges in bulk mode at 30amps for around 30secs, then the amps drop to 0 and it switches to absorption for around 30secs. This cycle keeps repeating.

I have tried using a replacement charger and the same thing happened. It has been working fine for around a month but has only recently started doing this.

Any ideas? Thanks

MultiPlus Quattro Inverter ChargerBlue Smart Chargerip22
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Can you share some more info, what battery are you using, cable size between charger and battery and also the length of this cable. It sounds like a large voltage drop between charger and battery could be the cause

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