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Cotek inverter repairs

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Good day everyone, 

 

We have a cable fault location unit that uses a Cotek 3000w pure sine wave inverter as power source from 4 x 12v deap cycle batteries connected in 24v configuration for its a 24V inverter. 

The inverter starts up sometimes and runs fine. Sometimes it starts up and dies after a few seconds.  When you switch it off, it has a reset delay of almost 3 minutes before you can switch it on again. (we never had that problem in the past) 

The unit is about 9 years old and are loaded in the back of a land cruiser. 

 

My questions, 

Where do I send cotek for repairs and/or does the problem sound familiar to those who use cotek and can it be repaired easier than sending it in. 

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