Dear Forum
I am setting up a small ESS system with a Multiplus compact 24/1200. It has only one relay to disconnect from mains when gridsupply fails. I thought I read somewhere that at least two relays in series are required for the anti-islanding requirements. Am I right in that? (If so I do not think that an economical add-on exists to make this a beneficial exercise.) Thanks for your support.
I think that highly depends on the country you’re living in, plus some local regulations that may apply.
The best way to figure out is to ask a (local) expert to look at the available certifications and check them against local requirements.
Thanks for the reply. I am in the Netherlands. Netbeheernederland.nl published a list with inverters allowed. Only the recent Victron multiplusses, easysolars etc are mentioned. (But not all…)
Hello, for the moment I have the same problem in germany for the MultiPlus 800.
I want to build a “Balkonkraftwerk”. But VDE-AR-N-4105 is not possible for the MultiPlus 800.
By the way for the MultiPlus C 800 the certificate exists but the device is sold out esp. for the needed 48 V series.
Does really two mechanical relais are needed? I remember the Deye SmartInverters lost there registration because 1 of 1 mechanical relais was missing and the second was an electronical relais.
However if the missing relay is the only part my idea is to connect an second relay in the gridpath of the inverter which disconnects if a grid power failure is registered by the MultiPlus. An Energymeter before the relais could register then when the failure is gone and let the MultiPlus connect the relais again.
So in this case we have a simple solution to get the missing part and only a software/firmware update is additionally needed.
I guess you mean this?:
It says:
In combination with an external network and system protection device (ge: NA-Schutz) and an external power management system.
Adding an external relay would be easy but is not a certified solution.
Unfortunately it’s not that easy.
You would have to install a certified external NS-protection (deutsch NA-Schutz) like a Ziehl UFR1001E.
I had the plan to add two relays as I have 3 phases. So the feedin on L1 and this line guarded by two relays in serie, one powered by L2 and the second by L3. But I could buy a cheap brand new Ziehl relay so do it that way. I can now stick to the multiplus and build a three phase system with them, buying secondhand. I heard few comments on youtube where installers were in favor of this older line of more rigid versions of Victron.
Hmm, yes. I’ve overread it. So it is the same as with the MultiPlus 800 without C.
The multiplus itself looks like is allready prepared to proceed the NS protection. As understood only the second relay is missing. If this is the cause it is possible that the Multiplus/Cerbo/energymeter kombination with an additional relay (german Installationsschütz) with a additional helping switch attached could give all the needed parts to get the certificate. The MultiPlus itself should switch on and off the addional relay and the cerbo should register with the energy meter that after a power failure the energy is back on wire.
Or is there another cheap way to add an external NS Protection only for the Victron MultiPlus 800 especially for a 1 phase connection, best in one device? All devices I found are for 3 phase. I found a finder device which looks like can detect over/undervoltage also frequency shifts. Also phase shifts could registered so it could be possible to disconnect the MultiPlus with adittional relais if a PowerFailure and other issues are detected. But it is not the same as a as NS Protection declared device. Does anybody knows a cheap 1 phase ns protection they is welcome to inform me.
But I mean the easiest way is Victron builds a limited MultiPlus II to 800 W for easy creating a Balkonkraftwerk. By the way how get I Victron to make it?
the local regulations you have to follow should help you
The easiest local regulations for Balkonkraftwerke are max. output limit 800 W, internal NS-Protection and more described in VDE-AR-N 4105 and some more stuff.
Thats the reason I want to build a simple Balkonkraftwerk, it can plugged easily and if I change my home I move it also to my new home.