We have a model Y and mainly charge from our trailer using Solar, except for long road trips. I want to be able to control the Tesla Wall Charger so my batteries in the trailer is not drained too deep.
We have over 6 kW of Solar Panels on the trailer, 10 kW of inverter and 20 kWh of battery storage.
The main problem I have is the minimum charge level cannot be set lower than 50%. That means when I arrive home in the evening with 10%-15% can I not plug-in the car because it will charge more energy (40% * 80 kWh = 32 kWh, with no loses) than my batteries hold. If I need to drive in the morning for a short trip is the battery too low and I have to wait for the capacity from the battery in the trailer transfer to the car. With 40 Ampere is that almost 2 hours with 40 Ampere for the 16 kWh I want to use.
Anybody with a good idea to solve this?
I know I can just cut the power to the charger with a relay, but that seems like a bad solution with 40 ampere flowing. I rather have a nice software solution than gently stop the charging.
Another issue is the repeated charging during the night as the graph below shows.
Even when the car has reached the charging limit is it repeatedly draining the batteries in the trailer for a short time each hour. Again a control of the Tesla Gen 3 Wall Charger with a simple timer, RPI (Raspberry PI mini computer) or API can solve this too.
We have over 6 kW of Solar Panels on the trailer, 10 kW of inverter and 20 kWh of battery storage.
The main problem I have is the minimum charge level cannot be set lower than 50%. That means when I arrive home in the evening with 10%-15% can I not plug-in the car because it will charge more energy (40% * 80 kWh = 32 kWh, with no loses) than my batteries hold. If I need to drive in the morning for a short trip is the battery too low and I have to wait for the capacity from the battery in the trailer transfer to the car. With 40 Ampere is that almost 2 hours with 40 Ampere for the 16 kWh I want to use.
Anybody with a good idea to solve this?
I know I can just cut the power to the charger with a relay, but that seems like a bad solution with 40 ampere flowing. I rather have a nice software solution than gently stop the charging.
Another issue is the repeated charging during the night as the graph below shows.