Dear community, during the past years I designed and set up several Victron installations. Now I’m running into some problems for the first time after upgrading an existing installation. After one year of operating a 6,8 kWp east-west roof array connected to a MPPT RS 450/100 with a 3-phase MultiP…

Thanks for the reply and the link, will have a closer look shortly. What is the difference in age between your units? The distribution box on my picture is just a sub-panel near the PV installation. In the main panel there is a EM24 connected via RS485 to USB interface to the cerbo. BRGS Jochen

3x1,5mm2 is really small, could that be the isseu? I would use at least 4mm2, mine are on 6mm2 however But it all depends on local regulations

Best is to put them under load and use a clamp meter to check if they are all at least behaving the same for AC IN/OUT. I have a node red flow that does this digitally as well.

Thanks for your reply! In the document Parallel, split- and three-phase VE.Bus systems [Victron Energy] there is the following statement: Warning against over-dimensioning the AC wiring Note: Do not over-dimension the AC cabling. Using extra thick cabling has negative side effects. Therefore I…

Thank you, I will do that and report back. However during first power up with only about 1500W of load on the ESS and with a half-full battery and plenty of pv power the system was unable to keep the grid consumption at or around 0W as set in the ESS menu, instead about 5kW were immediately drawn …

Your peak power is much higher than 3kva, 5500W 23A so i would suggest to use that for sizing of your cables Regulations in NL are different from DE, to install 1,5mm2 with 23A would not be ok here :blush: 4mm2 would be the minimum here

So you say you have 3k parallel system running with 4mm2 cabling and no problems? I would happily go up one or two steps here but the above mentioned warning from the OEM kept me hesitating. If you have done so I will give it a try once the system is running…

No i dont, my whole house is on 3phase single 3kva multiplus 2, hence the 6mm2 Just pointing out that i think that even with DE regulations your 1,5mm2 is too thin Oversize is not ok, but undersize also :blush:

@ all: In order to solve the problem I played a bit with the AI and although not extremely specific at one point I was asked if I had connected the Neutrals on the AC OUT side. At the moment actually there isn’t any kind onf wiring on the AC OUT side - it is yet completely unconnected. Backup pow…

Upgrade to 2x3 MultiPlus II 48V 3kVA 230V parallel - not running stable

Q&A and troubleshooting

Janvi (Janvi) 4 April 2025 18:58 2

I recently upgraded my system from 2x3 to 3x3 Multiplus and both configurations work fine.
What model of grid counter do you use ? I dont see one in your AC distributor.

Topic		Replies	Views
3 Multiplus in parallel + GRID + PV + ESS do not work DIY parallel , ess , grid_parallel	21	2107	20 September 2024
Multiplus 2 GX and Multiplus 2 Parallel Issue DIY multiplus , parallel , multiplus_2_gx	12	592	6 September 2025
How to connect 3 Multiplus II 48V, 3KVA, for split-phase (240V) and parallel Q&A and troubleshooting victronconnect , diy , offgrid , parallel , multiplus-ii , split-phase	0	203	8 May 2025
Parallelschaltung zweier Multiplus Inselanlage AC Absicherung Deutschsprachiger Bereich victronconnect , beginner , parallel , multiplus-ii , victron_community	5	352	20 May 2025
Frage zur Konfiguration: Upgrade auf 3x MultiPlus-II 48/5000 - Netzparallel vs. AC-Out Deutschsprachiger Bereich diy , parallel , ess , multiplus-ii	9	790	5 May 2025

Upgrade to 2x3 MultiPlus II 48V 3kVA 230V parallel - not running stable

Related topics