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I'm sure that if you do detailed simulations you'll find that it is cheaper for you and better for society as a whole to just put in a 15 kW solar system and skip all of the batteries, but do as you please. It is, after all, a free country.
I can pitch in the micro work for talking to the pack and managing the buck to maintain maximum power point of the string. What is needed is the coms protocol for the battery and that will require reversing Tesla's work (as I do not believe they will be telling us for fear we would set our houses on fire as we climbed the learning curve). The reverse engineering likely violates the agreement an owner (like me) signed. There was the rub for me.
Didn't say I've be designing the individual *components* from scratch... as I said, I want to try to utilize the existing BMS if I can figure out how.
As for cell level balancing, I don't even know what Tesla does in this regard as of yet. The battery is just charged at high voltage from what I can tell, as one unit.
A simple high voltage cutoff relay on the solar DC would be similar to what most people in the DIY community use to avoid overcharging the pack. Ideally the existing battery management system would also work at the cell level to keep the pack balanced. Presumably the BMS also has a high voltage cutoff as well.
What is your plan for the electricity being produced once the battery is full?
Modules in series | Modules per group in parallel | Voltage Charged | Voltage Discharged |
16 | 1 | 403 | 340 |
8 | 2 | 201.5 | 170 |
4 | 4 | 100.75 | 85 |
2 | 8 | 50.375 | 42.5 |
1 | 16 | 25.1875 | 21.25 |
3 | 5 | 75.5625 | 63.75 |
5 | 3 | 125.9375 | 106.25 |
7 | 2 | 176.3125 | 148.75 |
The standard maximum dc voltage for PV modules and solar inverters installed in the US is 600 volts.
Every automaker has already broken down its Model S battery, so there's probably no harm in posting your pics.