Looking for some feedback on my grid tied battery setup.
Background - 2yr old new build home. Have 2 EVs (i3 & Model Y). DIY solar installed - 48 340W Q-cell panels with Enphase iq7. ~11.6kW AC peak output. I buy electricity at about $0.14/kWh and sell it for about $0.076/kWh. Right now I am exporting about 75% of what I produce due to the EVs charging at night. I want to add a battery to capture that $0.06-0.07/kWh that I am leaving on the table. Using my Feb-March solar production and export data a 40-70kWh battery is the most beneficial. We have been experiencing a few power outages so the backup battery is useful there, thou I do not plan any automated options here. I would probably just manually turn breakers on etc to get back up. I may need to do a critical load breaker box simply to give me more breaker locations.
Battery - While I have battery building experience (EV builds) I have decided not to go with building a DIY 48V system. At 40-60kWh size the time to take smaller modules and wire them up and house them is a big deterrent. The high currents/heat potential of at times 11kW is also a con for me. I want to mitigate risk and lots of hand build connections and DIY BMS doesn't sound fun. I am going with a Tesla battery LFP preferred but NCM if I can not get the deal I want. Integrated BMS, locking connector, housing complete, automotive quality, etc.
Inverter - Right now I plan for a Solis S6 11.4kW with a Dala Battery Emulator. This would be setup in self-consumption mode to charge off excess day time solar and then charge EVs and run home during the evening. Time based charging/usage setup will allow me to stay under the 11.4kW battery output limit.
I also looked at the AIM and SolaX options, but they were undersized and more money. The FoxESS also looks good and cheaper, but doesn't have as much functionality (in one box) and not a lot of reviews.
System - Plan right now is for the Tesla battery to go on the wall of my insulated carriage garage. Temperature monitoring shows this room stays above 32F mostly year round. Run DC HV cables in conduit through my basement ceiling and then BMS wire to the Solis inverter in the basement next to the main panel. This would allow me to direct AC couple my existing solar if needed (ie solar going through inverter for off grid usage). I may forgo this in order to allow future Solar additions through the Solis (gas furnace heat converted to heat pump) or just simplicity.
Any concerns about Inverter selection? Solis vs FoxESS vs others
Any major concerns that the S6 Solis won't be compatible with the Battery emulator?
Any concerns about inverter placement and wiring?
Just looking for a sanity check and any pointers with this setup
-Kyle
Background - 2yr old new build home. Have 2 EVs (i3 & Model Y). DIY solar installed - 48 340W Q-cell panels with Enphase iq7. ~11.6kW AC peak output. I buy electricity at about $0.14/kWh and sell it for about $0.076/kWh. Right now I am exporting about 75% of what I produce due to the EVs charging at night. I want to add a battery to capture that $0.06-0.07/kWh that I am leaving on the table. Using my Feb-March solar production and export data a 40-70kWh battery is the most beneficial. We have been experiencing a few power outages so the backup battery is useful there, thou I do not plan any automated options here. I would probably just manually turn breakers on etc to get back up. I may need to do a critical load breaker box simply to give me more breaker locations.
Battery - While I have battery building experience (EV builds) I have decided not to go with building a DIY 48V system. At 40-60kWh size the time to take smaller modules and wire them up and house them is a big deterrent. The high currents/heat potential of at times 11kW is also a con for me. I want to mitigate risk and lots of hand build connections and DIY BMS doesn't sound fun. I am going with a Tesla battery LFP preferred but NCM if I can not get the deal I want. Integrated BMS, locking connector, housing complete, automotive quality, etc.
Inverter - Right now I plan for a Solis S6 11.4kW with a Dala Battery Emulator. This would be setup in self-consumption mode to charge off excess day time solar and then charge EVs and run home during the evening. Time based charging/usage setup will allow me to stay under the 11.4kW battery output limit.
I also looked at the AIM and SolaX options, but they were undersized and more money. The FoxESS also looks good and cheaper, but doesn't have as much functionality (in one box) and not a lot of reviews.
System - Plan right now is for the Tesla battery to go on the wall of my insulated carriage garage. Temperature monitoring shows this room stays above 32F mostly year round. Run DC HV cables in conduit through my basement ceiling and then BMS wire to the Solis inverter in the basement next to the main panel. This would allow me to direct AC couple my existing solar if needed (ie solar going through inverter for off grid usage). I may forgo this in order to allow future Solar additions through the Solis (gas furnace heat converted to heat pump) or just simplicity.
Any concerns about Inverter selection? Solis vs FoxESS vs others
Any major concerns that the S6 Solis won't be compatible with the Battery emulator?
Any concerns about inverter placement and wiring?
Just looking for a sanity check and any pointers with this setup
-Kyle