Hi there,
another thread asking about which inverter to buy for a DIY powerwall... :blush:
The current situation: 1.9 kWp solar panels installed (but likely to be expanded to 8 kWp in 2-3 years). The 1.9 kWp panels are now connected to a Fronius IG-15, which delivers to 1 phase of the houses 3 phase grid connection.
Now I am planning to build a DIY powerwall using Stuarts DiyBMS v4. So I would need a "ongrid battery inverter", that just charges the battery from the grid whenever the Fronius IG-15 is delivering solar power. And that delivers power from the battery to the (house) grid when there is consumtion but no solar power.
I was looking at the Victron Multiplus II (which has optional a 1 phase current sensor) and also to MPP/Voltronicpower.
And there are some things unclear to me:
1) to level out consumption from grid versus solar production and power delivered from the battery bank, I would need a current sensor that sums up all three phases and tells the battery inverter how much to deliver from the battery bank => the Victron Multiplus II sensor itself can do that only at one phase, no? => does the Victron support some kind of 3 phase current sensor (which would need to be at the houses grid connection)?
2) is there any inverter from Voltronicpower that can also do this levelling out but doesn't have the solar inverter built in (i don't need that and I guess it's better to have things modular... e.g. if the battery inverter breaks, the solar inverter is still delivering to the grid
3) can the Victron Multiplus II handle the battery bank without communication any BMS? (so I would like that the DiyBMS would have a main relay to cut off the battery bank in case of over/undervoltage, but wouldn't talk to the battery inverter)
4) any suggestion which 3 phase current sensor to use at the houses grid connection?
Sorry for asking again the inverter question, but I was reading a lot about this topic and I'm still quite confused how to achieve to level out grid consumption.
Thank you very much!
Manny
another thread asking about which inverter to buy for a DIY powerwall... :blush:
The current situation: 1.9 kWp solar panels installed (but likely to be expanded to 8 kWp in 2-3 years). The 1.9 kWp panels are now connected to a Fronius IG-15, which delivers to 1 phase of the houses 3 phase grid connection.
Now I am planning to build a DIY powerwall using Stuarts DiyBMS v4. So I would need a "ongrid battery inverter", that just charges the battery from the grid whenever the Fronius IG-15 is delivering solar power. And that delivers power from the battery to the (house) grid when there is consumtion but no solar power.
I was looking at the Victron Multiplus II (which has optional a 1 phase current sensor) and also to MPP/Voltronicpower.
And there are some things unclear to me:
1) to level out consumption from grid versus solar production and power delivered from the battery bank, I would need a current sensor that sums up all three phases and tells the battery inverter how much to deliver from the battery bank => the Victron Multiplus II sensor itself can do that only at one phase, no? => does the Victron support some kind of 3 phase current sensor (which would need to be at the houses grid connection)?
2) is there any inverter from Voltronicpower that can also do this levelling out but doesn't have the solar inverter built in (i don't need that and I guess it's better to have things modular... e.g. if the battery inverter breaks, the solar inverter is still delivering to the grid
3) can the Victron Multiplus II handle the battery bank without communication any BMS? (so I would like that the DiyBMS would have a main relay to cut off the battery bank in case of over/undervoltage, but wouldn't talk to the battery inverter)
4) any suggestion which 3 phase current sensor to use at the houses grid connection?
Sorry for asking again the inverter question, but I was reading a lot about this topic and I'm still quite confused how to achieve to level out grid consumption.
Thank you very much!
Manny