Ik ben voor ons thuis een systeem aan het designen en zit met het volgende:
Op dit moment hebben we een 1-fase aansluiting van 40A en daar hebben we destijds de pv omvormer 5000W (SMA met 5800WP aan panelen) op uitgezocht.
Maar in de nabije toekomst gaan we meer elektra verbruiken (hybride-warmtepomp + warmtepompboiler, extra airco en wellicht nog een EV) dus lijkt het mij verstandig om de grid aansluiting naar 3 fasen (3x25A) om te laten zetten.
Vanaf dat moment zou ik een 3 fase 48/5000 setup willen neerzetten met de woning op de AC out1, waar ook een huidige pv inverter op zit. Dat zou betekenen dat er (op zonnige dagen) 5000W via omvormer L1 binnenkomt op AC out1. Dat zou de omvormer aan moeten kunnen volgens mij (1:1 rule) maar is het zinvol om de 1 fase pc inverter te vervangen door een 3-fase variant zodat deze op alle MP inverters de load verspreid?
Thanks for you reply, yes that would mean a new PV inverter But after reading the phase regulations i understand the the ESS will balance the PV excess internally, correct? This system is planned for NL, what do you mean with battery requirements?
Yes, when charging the battery. No when for example L1 has excess and L2 has a load. In the Netherlands the meter calculates the import/export for all phases combined so this is not a problem.
See point 3, should be no problem in your case with 3x multiplus 5000.
I would surely opt for a new type Victron Multiplus II 48/6k5/100-50 Yes it is still almost twice as expensive, but trust me. With what you want…you’re not going to be disappointed. I can’t say that for the current model. The good thing is that you can start with one. Or two. I did the same at home.
And about what Marc said:
3000VA >= 3000Wp
5000VA >= 5000Wp
8000VA >= 8000Wp
Now lookup the datasheet of the new multiplus. You won’t regret it. Future proof
The max PV power must be equal or less than the VA rating of the inverter/charger
2.1 Rule definition
In both grid-connected and off-grid systems with PV inverters installed on the output of a Multi, Inverter or Quattro, there is a maximum of PV power that can be installed. This limit is called the factor 1.0 rule: 3.000 VA Multi >= 3.000 Wp installed solar power. So for a 8.000 VA Quattro the maximum is 8.000 Wp, for two paralleled 8000 VA Quattros the maximum is 16.000 Wp, etc.
Yes regarding the 1:1 rule VA equals Watt output of the PV inverter (what i understood from Harold ).
Regarding to the 6k5, i know it is the next-gen inverter but if i look at the specs, it’s almost as heavy, equal or less efficient, but it can handle more power. But that’s the only upside i would say, maybe it will receive updates longer because it’s the newer model, OK 2 plus points But does it justify the extra money?
@ChiefSolar Are you on or off grid? With off grid i understand the overload, but with on grid, grid will support the battery
my system was 3phase 3x mp2 3k on grid and ceramic cooking, never had an overload (not similar as induction of course!)
@hjkoster400d Recently i updated our system to 3x 5k mp2 for future use (heatpump install coming up), so yes take a good look at what you want the system to be capable of!
Off grid cabin in Norway. At home grid tied. The induction cooktop can pull as much as 9000Watt. Same one in both homes, but in the cabin we don’t use the highest setting.
We’ve a AEG 7.2kw cooktop, connected to a single phase (grid fused @40A40A) But in the 3-phase situation in was thinking spreading the cooktop load over 2 seperate phases (grid fus@25Ad @25A). That would mean 3.6kwh load per Multiplus when running the cooktop on full power
You two got to agree that there is no room left. Not for anything.
The temperature could also become a limiting factor. And with a heat pump or AC then there is just not enough. You can pull from the grid of course, but also we factored in grid down time. Hence having eight 16kWh batteries. I need to charge the EV as well or we might get stuck in a remote place
Yes thats true, NL has a solid grid, outages are rare (altough increasing), worst case i cant cook and have to warm something in the microwave when grid is out😊
Thanks for the input, i’m busy calculating the AC cable size that will run from the grid to the backyard 30m and back to the utility meter where it gets distributed throughout the house.
I am thinking about limiting the current to 32A coming from the ESS to the house, so im calculating with 32A 30 meter. 6mm2 should be sufficient, but a 10mm2 cable will have less voltage drop and therefore is more efficient. What do you guys think? Because a 10mm2 cable is 2 times the price (€650 instead of €350). Although cost is not an problem, its a shame to throw it away😇
I think i know how i want to do this, 6mm2 from the grid to the ESS with a C20A at the beginning and a 10mm2 cable back to the house with a C32A at the start of that cable. Because the current from the grid to the ESS will be max 20A but the ESS can produce an additional 18A through the return line. Resulting in a total of 38A. Does that sound logical?
But after reading the phase regulations i understand the the ESS will balance the PV excess internally, correct? This system is planned for NL, what do you mean with battery requirements?
