Sol-ark 12k Help

[Chris72]

I am having an issue when I'm charging my EV @ 40a my inverter is set to only use the grid during the time that I charge (off peak) but it seems to be pulling 10k from the grid and 2k from the battery no matter what. If I set the car to charge at 32 amps instead of 40a then it only pulls about 700w from the battery the rest from the grid. From my understanding in the time of use set up if you have the battery set to 100%, it should ignore it.

My setup is two sol-ark 12ks in parallel. 2 EG4 Power Pro batteries 14000w solar 6 DC strings and 1 string 2000w solar micro inverter AC coupled.

 

[robby]

Yes if TOU is set to 100% it will not use the batteries in that time slot.
What time are you charging the Car?
What is the Maximum Amp Draw that you set for the Batteries?

 

[Chris72]

Yes if TOU is set to 100% it will not use the batteries in that time slot.
What time are you charging the Car?
What is the Maximum Amp Draw that you set for the Batteries?

EV Charging starts at 10:30 pm. On the 12k that time slot the battery is set to 100% 9000w in case I want to charge powerpro from the grid but I have that disabled. My EV charger is on my main panel not my critical loads panel if that helps.
Battery charge and discharge 185a per inverter.

 

[glandpuck]

I looked at your images. Question: You are charging your EV from your main panel at 40 amps 240V so 9600 watt draw from the grid. You appear to be charging the EV in the middle of the night when there is no PV present. The inverter is limited to selling to the grid a total of 9600 watts or the 40 amps. So since there is no excess PV at night, you are expecting the inverter to sell from your batteries to your main panel. You have not mentioned if you have a critical loads panel being supplied also. First, I wonder why you want to sell from batteries in the middle of the night when it seems utility power would be the cheapest. If it is, you should be charging your vehicle AND batteries at the cheapest utility rates. Your batteries would then be used to offset the highest utility rates.
If you move your EV charger to a sub panel connected to the loads output of the inverter, then the batteries plus any grid power you need will supply the charger.

Next, you have 2 EG4 power pro batteries totaling 14.3 kW x 2 = 28.6 kW. If starting at 100% SOC and drawing down to 20% SOC, that is 22.88 kW. Divide this by 9.6 kW/hour EV charge rate = means your batteries can charge your vehicle for only 2.38 hours. Any if your vehicle is an BEV only and not a plug in hybrid, your battery bank is somewhere around 65 kW or larger so at best you are nowhere fully charging your vehicle from your batteries. If your vehicle travels 3.2 miles per kW, then you are adding 73.2 miles from your batteries at the expense of putting a lot of "wear and tear" on your batteries. Plus is it really charper than the grid.

I am in So Cal, our nighttime rate is $0.15/kW and that's when I charge cars and if needed batteries. I use batteries to offset higher time of use rates.