Regarding the Cca requirement for the battery cables:
Any objection against using “regular” battery cable and putting it in some kind of Greenflex? For heat dissipation not the ideal solution, but in these relative low voltage systems, voltage drop is more constraining than temperature, I believe.
If I’m not mistaken, the VOB wires themself in the Cca preflex systems are also not Cca per se.
Is there someone on this forum that has had a Victron DIY approved (gekeurd) according AREI?
This is driving me absolutely crazy tbh.
Last thing I heard from a former AREI inspector is that MEGA fuses are not allowed in BE residential installations.
Also, very unclear what the rules are regarding DC cabling. Same former inspector says Cca rules apply to cables, not individual conductors. And that black-red cables are a must. But also sends me a link to cables from Cebeo which are grey and DO have Cca approval.
I have the same questions and concerns.
Nobody from Belgium here that has a DIY system actually certified?
@bernieke: did you place the inverters on a “Gyproc” board? Do you know if there are some special requirements?
Does the background need to be fireproof or so?
In general, electricity panels are mounted on “betonplex”. Do you know if this is OK for the Multiplusses?
Also: what type of multiplus do you have ? 3kVA?
Mine is “in progress of being built” but it’ll take some more time before it’s finished and inspection is due.
Mine is also in progress of being built. I still need to run the cables from my main breaker box to the secondary breaker box (AC-connections to the inverters).
And I need to edit my “eendraadsschema” to reflect the new situation. Then we’ll see how it goes for the certification.
what DC cables are you guys now using?
Seeing the discussion above, I see more people struggling to find Cca rated DC cables…
Also: @herriejr: what cabling/fuse do you use for the AC side ?
Normal 2.5mm² and a 20A fuse? a multiplus 3000 can deliver 2400W continuously (2.5mm²/20A is fine), but peaks up to 5500W (20A fuse would trip).
Do you take the 5500W into account? I guess that if you start a big draw from the batteries (like a car charging in the evening), the multiplusses try to deliver the current, exceeding the 20A ?
On the AC side I am cabling everything with 10mm². I have a 3-phase connection with 3 Multiplus II 48/8000/110, capable of providing 15kW peak (if I remember correctly).
Breakers used:
Also the breakers commonly used in Belgium (curve C) can handle a peak above their rated current for some amount of time. For details you can google for tripping curve C.
Internally in my main breaker box I cabled everything with 10mm² almost 20 years ago (it’s not easy, but it gives me a peace of mind for later additions etc), therefore I opted to continue with 10mm². The cables I still need to run are 5G10; that won’t be easy 
OK, thanks for info.
I also have a 3-phase, (3x)32A grid and cabled everything inside the breaker box using 10mm², but I am looking into 3 x Multiplus II / 48 / 3000VA to stay under 10kW…
Do you have a “BTW nummer”?
BTW did you use Cca DC cables?
Yes, we have a VAT number (“BTW nummer”), it’s for my wife her business we need such beefy inverters.
I ordered these cables:
DWS Accukabel M8-M8 50 mm² rood 0,5 meter - Kabels - Overige elektra - Elektra - Caravan & camperaccessoires , on the product page the mention “double isolated”. These cables are Ripcaflex (Ripca). On the product page I see they still mention an older norm regarding flame retardant properties (EN50265 - CCA is defined in '“AREI” as NBN EN 50575:2014/A1:2016/artikel 104).
I have asked them if their cables are in accordance with NBN EN 50575. I will keep you posted.