DIY 3 phase ESS installation in Belgium - Do's and dont's to get legalized (AREI)?

DIY
,
82

For cebeo you need a VAT number. If that’s a problem for you (you don’t know anyone with a VAT number willing to order them for you), you can try contacting gigatek.be, they are a cebeo reseller. I see they have the fuses for sale on the website, but the fuse holders not, but if you ask them they’ll probably order them for you as well…

I paid 37 euro per box of three fuses, and 132 euro per 3p fuse holder (vat incl.)

I used the thermal camera for peace of mind, but it wasn’t necessary, nothing went higher than 30 degrees celcius or so. I imagine if you follow proper design rules (good quality components, sufficient cable thickness, …), crimp the terminal lugs well, and torque the bolts correctly, you shouldn’t have any issues.

83

Finished the inspection today. Now waiting on the report to notify Fluvius.

PXL_20251229_155535324
PXL_20251229_1555353241693×1275 388 KB

84

Congrats!
Do you mind sharing the full details of your setup and components at some point?

85
  • 3 x 16kWh battery seplos mason-314L-O with EVE314 MB31 cells
  • 3 x 5kW inverter victron energy multiplus ii 48/5000/70
  • victron energy cerbo gx
  • transfer switch sontheimer 10017602
  • general cable RZ1-K 1x50 Cca DC & RZ1-K 3G10 Cca AC cables from ilumitec.es
  • 6 x mersen NH1 gG 500V 200A NH1GG50V200 fuses
  • 2 x mersen PP 3P NH1 BB13PP fuse holders
  • 40x10mm & 60x10mm flat red copper to build busbars
  • klauke terminal lugs 106R10, 106R8
86

Thanks, and the AC components, you have the Sontheimer and what RCD’s and Type-B ELCB’s do you use?

87

All Schneider:

  • 2x 40A 4P 300mA type B A9Z64440
  • 40A 4P 30mA type B A9Z51440
  • 32A 4P C curve A9F79432
  • 40A 4P B curve A9F73440

Some from amazon.com.be, some amazon.de, some gigatek.be, and the 30mA from electro-colli.be, wherever I could find them cheapest.

I attached my “eendraadschema” below.

PXL_20251229_155039351
PXL_20251229_1550393511693×1275 434 KB

bord 1 - kelder 3P.pdf (35.8 KB)

88

Nicely done. Thanks, much appreciated!

89

I have a quick question regarding the battery:

Was the Yixiang V2 possible to get certified or did you switch to Seplos to get certified?

If the Yixiang V2 wasn’t certifiable, do you know whether there is a horizontal Seplos model that can be certified under AREI in Belgium?

I’m currently planning a similar setup and would really appreciate your feedback on what worked in practice.

Thanks again and well done!

90

Hello,

I had in mind to install 3x Multi RS for our renovation. They seem to be muchos buenos.
Looking a bit around, the question about the VAT seems to pop-up quite a lot.

I provided my case to the FOD, explaining the expected production and consumption. I also added some details regarding the expected revenue.

As we have not lived in the house yet, it’s a purely theoretical exercise.

Anyway, final result … no VAT / company registration required if the actuals are in-line with my predictions. As you can curtail, that will be no issue.

91

A lot of respect for this project.. not easy to try this with all these vague and complex regulations in Belgium..

I’m also going to build a similar setup, inspired by yours..

I’ll post updates on this forum later..

May I ask where you got the seplos batteries from? Thx

92

Direct from seplos.com (duty paid delivery).

93

Hi, I’m now in the middle of redesigning the house fusebox, As I have to replace it completly. It’s also pre 2023, so any major change requires me to add another 30mA diff and I currently have no space for that. I also have to create space for the new parts, so I have to take it down and put a larger box in.

I am in doubt about the selectivity. In my case, should I use a 300mA Type A or a Type S on the net side? What 300mA diff to use on the backup side?

I get different opinions. Both are allowed according to AREI, but some say a Type S could cause instability on the AC-coupling of my Enphase system and trigger faults on the Victron ESS, other say not using a type-S could make both the 300mA Type A and the 30mA type A trip when a fault occurs behind the 30mA diff.

Thanks,

Michel

94

Does this make sense?
Fluvius Meter Integration-2026-04-25-151643.pdf (287,9 KB)

95

Looks good, a few small remarks:

  • I think the solar inverter doesn’t require its own 30mA diff (that’s only required for lights, powersockets, and the EV charger if I’m not mistaken).
  • To make the “remautomaat” work, the solar inverter needs to be connected to the grid side (your image makes me think the solar inverter is connected in parallel with the rest of the house, which wouldn’t accomplish anything).
  • I made the victron OUT breaker a B-curve one (versus the regular C-curve breakers), because the victron can’t provide enough power on its own to trip a C-curve when in off-grid mode.
  • I’m assuming your EV charger has its own 4mA DC thingie? Otherwise you need to either add one of those, or (as I did) use type B diffs on the complete path from the grid to the EV charger.

Have fun building it all out :smiley:

The big cables like the 5G10 might elicit some cursing, but otherwise it should all be quite pleasant.

96

Hi Bernieke,

Thanks for your feedback. Unfortunately, I rushed this a bit and made some (more) mistakes. This is my updated version.

The solar inverter is no longer behind the differential.

My 22 breakers are now spread across three 30 mA RCDs.

I changed the Victron OUT breaker to a B-curve type (instead of the standard C-curve), because the Victron cannot provide enough power on its own to trip a C-curve breaker in off-grid mode.

I’ll double-check and change that one later.

I’m assuming your EV charger has its own 6 mA DC protection? Otherwise, you need to either add one or (as I did) use type B RCDs along the entire path from the grid to the EV charger.

Yes, the Warp3 Pro charger has 6 mA DC leakage protection.

Could you please review the attachment again to confirm I didn’t miss anything?

Much appreciated!
Fluvius Net 3N400V EV-2026-04-25-162535.pdf (297,2 KB)

97

Now it’s clear the remautomaat isn’t doing anything.

It’s supposed to avoid the possibility of 10A PV + 40A battery overwhelming the 40A diffs, but the PV is connected to the wrong side for that, it needs to be connected on the grid side of the remautomaat, along with the battery.

98

I hope I may bother you once again with an updated schematic. I have hopefully fixed it based on your feedback and also added the breaker for the VM3P75CT and the DC side of it.
I also separated things a little better.

I also included the mermaid code:

graph TD
    subgraph Woonhuis_Bord_A["Bord A: Woonhuis Hoofdbord"]
        Net["Fluvius Net 3N400V 40A - TT"] --- Hoofdsch["Hoofdschakelaar F40/3N"]
        Hoofdsch --- DiffH["Hoofddifferentieel 4P 63A 300mA Type A"]
        
        DiffH --- Meetpunt_Victron(("Meetpunt Victron VM-3P75CT"))
        Meetpunt_Victron --- Meetpunt_Enphase_Consumptie(("Meetpunt Enphase Consumptie-CTs"))
        Meetpunt_Enphase_Consumptie --- VerdeelNet(("Verdeelrail Net"))
        
        VerdeelNet --- AutMeter["Automaat 4P C2"]
        AutMeter --- VM["Victron VM-3P75CT Energiemeter"]

        VerdeelNet --- DiffEV["Differentieel 4P 40A 30mA Type A"]
        DiffEV --- AutEV["Automaat 4P C20 -- Voeding oprit"]

        VerdeelNet --- AutShedIn["Automaat 4P C40"]
        
        VerdeelNet --- Stand_I["Stand I: Netvoeding"]
        Stand_0["Stand 0: VOLLEDIG UIT -- Veiligheidstand"]
        
        Stand_I --- Sontheimer{{"Sontheimer ULO16-63 -- I-0-II Bronkeuzeschakelaar"}}
        Stand_0 --- Sontheimer
        Stand_II["Stand II: Backupvoeding"] --- Sontheimer
        
        Sontheimer --- Rail_PreRem(("Rail na Bypass -- Enphase integratie aan de back-up zijde"))
        
        subgraph Enphase_Beveiliging_Bord_A["Enphase PV-Koppeling"]
            AutPV["Automaat 4P C10"]
            Meetpunt_Enphase_Productie(("Meetpunt Enphase Productie-CTs"))
            Envoy["Envoy-S Metered"]
            QRelay["Enphase Q-Relay 3P"]
        end

        Rail_PreRem --- AutPV
        AutPV --- Meetpunt_Enphase_Productie
        Meetpunt_Enphase_Productie --- Envoy
        Envoy --- QRelay

        Rail_PreRem --- Remautomaat["REMAUTOMAAT 4P C40"]
        Remautomaat --- Rail_Huis(("Verdeelrail Huis"))
        
        Rail_Huis --- Diff30_1["Diff 4P 40A 30mA Type A"]
        Rail_Huis --- Diff30_2["Diff 4P 40A 30mA Type A"]
        Rail_Huis --- Diff30_3["Diff 4P 40A 30mA Type A"]

        Diff30_1 --- KringA["Kring A: 8x 2P B16/B20"]
        Diff30_2 --- KringB["Kring B: 8x 2P B16/B20"]
        Diff30_3 --- KringC["Kring C: 5x 2P B16/B20 + 4P B20 Kookgroep"]
    end

    AutEV ---|"EXVB-5G6 Traject oprit"| Warp3
    AutShedIn --- Kabel1["Kabel 1: 27m EXVB-5G10 naar Schuur -- Verbindingen tussen gebouwen"]
    Kabel2["Kabel 2: 27m EXVB 5G10 -- Voedt Stand II"] --- Stand_II

    subgraph Oprit_Woonhuis["Oprit"]
        Warp3["Warp3 Pro 11kW EV Laadpaal"]
    end

    subgraph Buiten_Woonhuis["Woonhuis dak PV"]
        Enphase_Woonhuis["18x Trina Solar 395Wp Panelen met IQ7+"]
    end

    subgraph Schuur_Bord_B["Bord B: Schuur ESS Installatie"]
        Kabel1 --- LastShed["Lastscheider 4P 40A -- Lokale isolatie"]
        
        LastShed --- MP_AC_IN[["AC-IN: 3x Victron MultiPlus-II 5000 -- Victron MultiPlus configuratie"]]
        
        MP_AC_IN === LynxDist(("Lynx Distributor - Gezekerd"))
        LynxDist --- LynxPowIn(("Lynx Power In - Busbar"))
        
        subgraph Accubank_Schuur["Seplos Accubank 32kWh"]
            MainBatSwitch{"DC Hoofdschakelaar 600A"}
            BatCable1["70mm2 DC Hoofdkabels"]
            Seplos1["Seplos Mason 16kWh / 280Ah Master"]
            DC_Link["70mm2 DC Koppelkabels"]
            Seplos2["Seplos Mason 16kWh / 280Ah Slave"]
            CAN_Bus["CAN-bus link"]
        end

        LynxPowIn --- MainBatSwitch
        MainBatSwitch === BatCable1
        BatCable1 === Seplos1
        Seplos1 === DC_Link === Seplos2
        Seplos1 -.- CAN_Bus -.- Seplos2
        
        subgraph DC_PV_Koppeling_Schuur["Victron DC PV-Koppeling & Combiner Box"]
            FuseMPPT["Zekering 80A"]
            MPPT["SmartSolar MPPT 150/60"]
            PV_Disc{"PV Lastscheider 2P 32A DC"}
            SPD_DC["SPD Type 2 DC Beveiliging"]
        end

        LynxDist --- FuseMPPT
        FuseMPPT ---|"25mm2 DC kabel"| MPPT
        MPPT --- PV_Disc
        PV_Disc --- SPD_DC
        
        MP_AC_IN -.- MP_AC_OUT1[["AC-OUT-1: 3x Victron MultiPlus-II 5000"]]
        
        MP_AC_OUT1 --- DiffShedOut["Differentieel 4P 63A 300mA Type A"]
        DiffShedOut --- AutShedOut["Automaat 4P B40"]
        AutShedOut --- Kabel2
    end

    subgraph Buiten_Schuur["Zonnepanelen schuur"]
        PV1["Paneel 1: 600Wp"]
        PV2["Paneel 2: 600Wp"]
        PV3["Paneel 3: 600Wp"]
        PV4["Paneel 4: 600Wp"]
        
        PV1 --- PV2
        PV2 --- PV3
        PV3 --- PV4
    end

    QRelay ---|"5G2.5mm2 AC Q-kabel"| Enphase_Woonhuis
    SPD_DC ---|"6mm2 DC Solarkabel"| PV1

PDF:
Fluvius Net 3N400V Power-2026-04-26-101908.pdf (874,5 KB)

99

If there is anyone willing to help me getting my setup up to code for an AREI inspection and make the single line drawing for me, I’m willing to pay for it.
Please DM or comment if you have the expertise to help!

100

Just came across this thread today.

I passed my inspection today. That makes it the third Victron system I’ve had approved so far. First one was in my previous house, second was on a friend’s installation, and this one is my current setup.

System:

  • 3 × Victron MultiPlus-II 5000

  • Cerbo GX

  • 2 × Seplos 560L (32 kWh each)

  • 3 × 16 kWh battery modules built with EVE cells

  • Total battery capacity: ~112 kWh

  • 1 × Victron SmartSolar MPPT 250/70

  • 1 × EASUN MPPT 150/100

  • 1 × Fronius Symo 10KW

Michel, you can generate the eendraadschema here: https://eendraadschema.goethals-jacobs.be/

I’ve attached my version as well.

image
image1500×2000 299 KB

eendraadschema_print (11).pdf (521.3 KB)

eendraadschema_ ZonnenPannelen.zip (2.9 KB)

101

Wow Nuno, seriously nice setup! Thanks for sharing, I’ll use your drawing as a base.

Are my eyes seeing a DIY eve batterij in the back?

Did you get that approved, or did you add later?

I would really like to use the Yixiang v3 DIY box with eve cells. Safer that most ready made batteries, but seems almost impossible to get approved.