Grid tied battery charger and inverter setup with TOU scheduling

[James_Q]

Hi,

I'm pretty new at this and have read a lot of discussions on this forum but still couldn't figure out what I need for my particular setup. So allow me to explain. I already have a solar system installed since 2014 (SolarEdge) in San Diego CA and grandfathered into NEM2.0, but system is not big enough to cover my peak usage during the day. I have multiple EV and PHEVs. For the PHEV I'm constantly charging during the day because it doesn't have enough EV range. I have EV-TOU rate that I pay $0.15 from 12-6AM but more than $0.8 from 4-9PM. My idea is to get a battery bank to charge from 12-6AM and pump the power back to the grid during 4-9PM so I can use it normally without having to disconnect from the grid and/or worry about battery capacity. I read the threads about AC coupling (battery backup) and off-grid system, but none of them solves my problem. So in summary, the system should:
1. Connect the charger to the battery bank from 12-6AM, charge to 90% then disconnect.
2. Connect the inverter to battery bank from 4-9PM, invert the power back to the grid, until the battery reaches 10% or 5%, then disconnect.

Is there an all-in-one hybrid inverter/charger with TOU setting that gives me what I want? If not, what are my choices? Is this even possible?

Thanks in advance!

 

[DIYrich]

Sol-ark.

 

[Luxpower_Gilbert]

any true hybrid inverter can do that, if money is not the problem go with Sol Ark, or the new EG4-18KPV-12LV which is the same as GSL/LUX 12K hybrid inverter, which is way cheaper.

 

[___]

Hi,

I'm pretty new at this and have read a lot of discussions on this forum but still couldn't figure out what I need for my particular setup. So allow me to explain. I already have a solar system installed since 2014 (SolarEdge) in San Diego CA and grandfathered into NEM2.0, but system is not big enough to cover my peak usage during the day. I have multiple EV and PHEVs. For the PHEV I'm constantly charging during the day because it doesn't have enough EV range. I have EV-TOU rate that I pay $0.15 from 12-6AM but more than $0.8 from 4-9PM. My idea is to get a battery bank to charge from 12-6AM and pump the power back to the grid during 4-9PM so I can use it normally without having to disconnect from the grid and/or worry about battery capacity. I read the threads about AC coupling (battery backup) and off-grid system, but none of them solves my problem. So in summary, the system should:
1. Connect the charger to the battery bank from 12-6AM, charge to 90% then disconnect.
2. Connect the inverter to battery bank from 4-9PM, invert the power back to the grid, until the battery reaches 10% or 5%, then disconnect.

Is there an all-in-one hybrid inverter/charger with TOU setting that gives me what I want? If not, what are my choices? Is this even possible?

Thanks in advance!

Are you looking for a permitted, city- and utility-approved solution?

 

[James_Q]

Thanks for replies. The EG4-18KV sounds like a good solution, but it's really expensive. Even a simple 15KWh battery setup would cost $10K+.

Also, I don't think I want/need to get a permit. I already have NEM agreement in place, so feeding back power is not a problem. I just need to install a system that's cost effective and reliable. My alternative is build a battery backup system that fills up at night, and charges my PHEV during on-peak hours without being grid tied. It's cheaper but requires some manual switching between battery and grid power in case the battery runs out.

 

[1201]

Do you just need the power for your phev and ev?

Just a cheap off grid inverter sized to handle those specific loads should work. Of course you would also need the battery power to supply the loads