Kilowatt Power Posted June 30, 2020 Share Posted June 30, 2020 Hi All, I trust we are all well. I just wanted to pick your collective brain on a residential self-consumption 3-phase grid-tied solar system with battery backup design. Essential loads night time energy demand: 2600W, 9.70kWh (during grid-loss events) Non-essential loads day time energy demand: 45kWh Solar panels: 16S1P Jinko 390Wp (49.3Voc, 41.1Vmp) Battery Bank: 4S2P 12V 200Ah VRLA AGM Off-grid single phase inverter: Axpert MKS 5K 3-Phase Grid-tie inverter: Ginlong Solis 3P6K-4G Electrical installation works are yet to commence and I've proposed putting all essential loads on one phase. The only 3-phase equipment include a 28kW central air conditioner and a pool pump. In your opinion, is there a better and more affordable way of maximising the solar investment other than using an expensive 3-phase true hybrid inverter? Quote Link to comment Share on other sites More sharing options...
DeepBass9 Posted June 30, 2020 Share Posted June 30, 2020 Just run the 3 phase equipment from the grid, and put everything else on a single phase. Is the solar and batteries supposed to drive the air conditioner, because at 28kW that will not last long. Quote Link to comment Share on other sites More sharing options...
Kilowatt Power Posted June 30, 2020 Author Share Posted June 30, 2020 59 minutes ago, DeepBass9 said: Is the solar and batteries supposed to drive the air conditioner, because at 28kW that will not last long. No. The proposed design has solar panels connected to the 3-phase Ginlong Solis grid-tie inverter and batteries on the single phase Axpert 5K inverter. Quote Link to comment Share on other sites More sharing options...
DeepBass9 Posted June 30, 2020 Share Posted June 30, 2020 Then there is no reason for a 3 phase inverter. Everything else can be run on one phase. My house was wired as 3 phase before I went off grid. You just bridge the 3 phases into 1 at the DB board and there you go. Quote Link to comment Share on other sites More sharing options...
Kilowatt Power Posted June 30, 2020 Author Share Posted June 30, 2020 5 minutes ago, DeepBass9 said: Then there is no reason for a 3 phase inverter. One objective is to save on electricity bills by supplementing grid intake with solar especially for the central air conditioner. 16 minutes ago, DeepBass9 said: You just bridge the 3 phases into 1 at the DB board and there you go I'm pretty sure you don't mean that I simply bolt the 3 incoming phases together at the DB. Quote Link to comment Share on other sites More sharing options...
DeepBass9 Posted June 30, 2020 Share Posted June 30, 2020 No, the 3 outgoing phases become one phase and run from a single phase inverter which you have on your diagram already. The only thing then running on 3 phase, on a separate circuit is the air conditioner, so you can cost that against the 3 phase inverter directly. Quote Link to comment Share on other sites More sharing options...
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