Ac in stopped working

Q&A and troubleshooting
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1

Scratching my head here why charging from generator suddenly stopped working after installing a panel for the generator .

Used to be wired directly to ac input ,but for safety and control added a panel with switch fuses and rcd between Genset and multiplus 2 .

When generator is running I Measure correct voltage at ac input terminals on all 3 multiplus 2.

But the multiplus won’t charge and gives alarm generator not detected at ac input.

There is voltage when Genset running ,rcd doesn’t trip ,everything looks good and is testing well

Voltage at rcd output ,proper voltage at multiplus ac input .

What happened ?

Thank you

2

3 phases ?
Rotating field on ‘R’ ?
Swap 2 of the phases and test again …

3

Good evening Sir !

Yes 3 phases…I didn’t understand the rest of what you said,I’m just an architect with limited electrical knowledge lol

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Who added a panel with switch fuses and rcd between Genset and multiplus 2 ?
You ?
Simply swap 2 of the outgoing OR incoming phases … no matter which one … then the rotating field changes

5

Yes me …remember was wired poorly with clamps and no grounds etc before . No beaker no switch no rcd between Genset and victrons…

So for example swap phase 1 to phase 2 position and vice versa?

Thank you

6

Yes … It could be that the rotating field is now set to ‘L’ … according to the country where it was built … Italy, for example, often has generators with an ‘L’ rotating field

The neutral and protective conductors should of course also be routed sensibly through the distribution board … as the condition BEFORE the distributor

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I did it and it works . I can’t tell you how much I appreciate your help . It’s four days cloudy cold weather coming and we are off grid . You helped me and my family a lot .

Wish I could buy you a lunch !

Ignore the wiring mess I will tidy it up .

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Perfect … that makes me happy :grinning:

Nice “Kuddelmuddel” :yum:

BUT replace the 30ma FI with a 100ma or leave it out completely … it only annoys you unnecessarily because you don’t need ‘personal protection’ here, only device protection.

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What is Kuddelmuddel? Haha …where are you based by the way ?

Yes I had a 30ma in stock , if it starts tripping I’ll get s 100 .

Do you think I should put. Type 1+2 spd here ? The Genset is 50 meters away outside .

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“kuddelmuddel” … a german word for ‘nice but slight disorder’

Surge protection in any case … 1+2 … yes … from DEHN or a similar one … and a good earthing at the generator !!! and on the distribution box !!! so that the surge protection can also discharge. otherwise it is useless … !!!

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Perfect ,you’re based in Germany ? Yes I’ve been upgrading the ground system .

There used to be no ground at the generator ,the electrician had no ground and no ground to neutral bond at Genset .

I asked him why and he said boats and rv /caravanvdon’t have grounds you only need one if you’re connected to the grid .

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The more ‘earths’ in the system … generator , distribution board , house … the lower the total resistance of the earth electrode and the protective conductor. All safety devices that rely on this … including residual current circuit breakers … benefit from this.
Depending on where and how the generator is housed, surge protection must of course also be installed.
Should an ‘overvoltage event’ occur there, it is immediately discharged to earth … i.e. type 1 surge protection on the generator and at least 2 in the intermediate box … of course 1+2 is also possible if you can’t get it any other way.

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