Solar + Battery + 3 phase advice
We have a barn conversion with a ground source heat pump and high electricity usage. We are planning on getting aircon and EV, so expect our usage to go even higher. Current around 7500-8000kwh per year.
To make matters more complex we have 3 phase but only a single phase is used for the house and GSHP and another phase goes to outbuilding where ev charger would be.
So in theory I either change everything to 3 phase which is expensive and my GSHP might not be comparable. Or I stick with single and accept the solar and battery services the house but the ev would be overnight tarrif charging only. But this might be risky in the future if my house electricity exceeds what a single phase input can draw.
- edit - my GSHP can’t be on 3 phase so would need to replace it which I wouldn’t want to. So does rule out 3 phase a bit unless there is another option
This means I couldn’t charge ev from solar on a nice warm day.
My winter usage is around 45kwh on a bad day, and I wouldn’t expect to generate much from solar on them days. So I’d need the battery to be charged overnight for cheaper and then run the house.
What would you do? And how is the quote? I’m getting prices from 2 local firms but I am baffled by the added complexity of 3 phase v single phase.
We’ve been quoted £18703 for:
Aiko Energy
14.550 kW Total Module Power
30 x 485 Watt Panels (AIKO-A485-MCE54Mb)
12,890 kWh per year
Sunsynk Single Phase 10kW-12kW Hybrid Inverter
12kW of Inverter Power
Sunsynk 1 x SUNSYNK-12K-SG02LP1
Sunsynk W-Series 10.64kWh Battery
31.8kWh of Battery Storage
Sunsynk
3 x SUNSYNK-W10.6
Module-level PV Optimizer
30 x TS4-A-O
£18703.