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karl avatar image
karl asked

MultiPlus 24/3000/70-50 Inverter Configuration Type

What type of inverter configuration is incorporated in the MultiPlus 24/3000/70-50?
Does it incorporate an isolating transformer?

or is it transformerless?

If it incorporates a transformer can you please let me know the impedance of the load side winding?

I am attempting to calculate the external part of the fault loop impedance (equivalent grid side impedance) for an installation (house load) that is connected to an EasySolar 24/3000/70-50 (which incorporates a MultiPlus 24/3000/70-50) as its sole source of supply?

Thank you for your time and help with this.

Multiplus-IIEasySolar All-in-One
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2 Answers
Rob Duthie avatar image
Rob Duthie answered ·

Hi Karl

Yes all Victron inverter chargers have an toroid isolating transformer. The impedance i don't know.

I just use a Fluke power multi tester for earth line impedance testing, as there is so many variables, any connections add to the impedance etc.

I had installation of a easy solar 12/ 1600/70 watt unit which had a loop line test of 18-20Ampsat the the end of circuit, or furthest socket outlet.

Measure with a meter to get a ball park figure Current = Voltage / Resistance = Amps


Regards

Rob D

NZ

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karl avatar image karl commented ·

Hello Rob,
Thank you very much for taking the time to reply, it is a great help and much appreciated.


Are you able to point me towards Victron documents that describe or specify that a toroid isolating transformer is used and that perhaps might also list some specifications for it?

When you say loops test of 18 to 20 Amps is this perhaps 18 to 20 Ohms measured for the impedance of the at circuit that you tested? or does you meter list amps that you need to convert to Ohms using the equation you specified?

We are measuring around 8 to 9 Ohms at the EasySolar 24/3000/70-50 with a Fluke multi tester and about 12 at the site main switchboard.

Thank you for your time and help with this, take care and be Well,


Karl T.

Perth Australia

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Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

The transformer is only used in inverter mode. If grid is available it will be pass-through directly to the loads via relays:

(This picture is in the manual and on the backside of the front panel.)


multi123000.png (141.3 KiB)
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karl avatar image karl commented ·

Hello M.Lange,


Nice, thank you for sharing this.


Take care,

Karl T.

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