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alia-rahim avatar image
alia-rahim asked

Generator Goes Over AC Input Current Limit

A split phase system with 2 x Quattro 15000 paralleled as master and slave. The AC1 input current limit in Quattro is programmed to 35A (See picture below).

1704166470708.png

In total is 70A current input from the generator when generator runs.

The generator is only called at 25% SOC to charge the batteries and supply load at the same time.

The issue here is that when the generator runs it pumps in at 74A when load is high. Why is it not limiting to 70A? Why is the Quattro allowing more current input than whats limited?

Please assist or any ideas would be much appreciated.

Generatorinput current
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2 Answers
Alexandra avatar image
Alexandra answered ·

Does turning it down a bit more not help? That is always an option.

It can be many reasons why it is not on point, one is current sharing on a parallel setup, the other is the 'noise' on the AC from the generator.

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alia-rahim avatar image alia-rahim commented ·

The current setup is tripping our 80A cb. That also means the generator current input went higher than that 74A. So we had to change the input current limit down to 60A.

However this could also mean when the load is high it might still ignore the current input limit and draw higher than 60A. Any thoughts?

Also, could you please explain further on the 'noise' you are referring to?


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CM avatar image
CM answered ·

Is weak AC selected on charger side ?

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alia-rahim avatar image alia-rahim commented ·

@Alexandra @CM yes
1704329445038.png

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CM avatar image CM alia-rahim commented ·

I want to believe the generator set is having a hard time keeping up with the 400amps current plus AC loads at the same time , probably reduce the input current by 5 and 10 until you get a favorable operating range that doesn’t trip the breaker , also what’s the frequency when the gen is running at those heavy loads ?

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alia-rahim avatar image alia-rahim CM commented ·
50-51 Hz (rounded up from two decimal points)

For the time being the current input limit has been reduced from 70A to 60A. We will have to keep monitoring it.

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