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sbenz avatar image
sbenz asked

Cummins Generator and Multiplus

Hallo,

I have a Cummins 7kW Generator which produces 220V/30.4A.

This is connected as 220V power input to my multiplus 1600 charger/inverter.

The charger inverter usually loads the battery with landpower >100A when battery is at 70%.

Using the generator the battery is charging only with max ~44A.

From my perspective the loading capacity using the 7kW generator as a source should be much higher. Actually I would assume almost the same as with landpower.


Why is it loading with such a low A and how can I change this?

Kind regards

Stefan


Multiplus-IIGenerator
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4 Answers
sbenz avatar image
sbenz answered ·

Hi I found the solution.

There is a switch in the settings for the Multiplus called

Weak AC input

This seems to reduce the charge current significantly.

I unchecked it and the generator as well as land power are almost at 70A charge current.


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Trevor Bird avatar image
Trevor Bird answered ·

@sbenz …. Hello Stefan, I’m not sure what voltage the Multiplus is but even the 12 volt version has a maximum charging client of 70amps. Is it possible when mains is used another charging source is engaged as the multiplus cannot supply the 100 amps quoted?

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sbenz avatar image sbenz commented ·

Hi,

thanks, you are right. The inverter/charger max load is only 70A. The only other source are solar panels with 400W. I need to recheck if it really shows >100A.


Nevertheless my main issue is why is the charger not loading at least with the 70A with the generator as the source?

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billknny avatar image
billknny answered ·

What kind and size of batteries? What is the state of charge and battery voltage when you see 44 Amp charging current?

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sbenz avatar image sbenz commented ·
I think it was 70% and voltage of the 4x130AH Gel batteries was around 12.6V.
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kevgermany answered ·

One of the settings in the Multiplus is an AC input current limit. This will affect the charge rate. I think the original value on your unit is 10A.

It can be set with a Mk3 USB adapter, PC/laptop and VE Configure software. Or from the control panel if you have a GX device connected to the system.

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sbenz avatar image sbenz commented ·
Hi,

thanks for the input but I do not think this is the issue since the Multiplus properly loads with land power up to 70A.

Could it be that the generator limts of ~40A at 220V is limiting also at 12V?

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