Power Offered below power taken

[pflik]

I'm a bit confused with the behavior of the car/TWC with solar charging:

I currently set the charging on solar. I have not integrated with the Tesla API, simply because it's really difficult to setup and i have a bluetooth setup that just works a lot easier and more reliable (for me). This is working through Home Assistant, not through TWC Manager. I did set in the config to use exclusively use TWC Manager to control the charge rate. In my mind this should work, as a car shouldn't be able to pull more than is being offered.

However I notice 2 things.

1. If the amps offered is 0, the car is still able to pull power. (see picture below)

2. It looks like TWCmanager is unable to correctly calculate the solar surplus correctly (having configed the power return as source, rather than power generation). Even though it is charging and the solar surplus is low, it doesn't understand that the charger is actually using 1.7 kw and that solar generation should be much higher)

The first means TWCManager cannot control the charging speed. The second means that TWCManager correctly calculate how much power it can offer (hence why 0 amps are being offered in the first place, while it should have been 2 amps).

Did i not configure this correctly?

[MikeBishop]

For the first, yes, that's the expected behavior. The TWC can't go lower than 5A/6A depending on region without being in an error state, and the norm is to use the API to start/stop charging. You can go into settings and change the stop method to "stop responding," which will force the TWC into an error state when it wants to offer no power. That has the upside that the API isn't required, but the downside that your car will a) notify you that charging stopped due to an error, and b) may eventually give up on the TWC until it's unplugged and replugged.

Since you have a Bluetooth control channel set up separately, you might be able to rig something up to have it send a stop command when the amount offered is zero. Just a thought, though, I don't know the details of your BT control side.

For the second, I think you're looking for the subtractChargerLoad option in your config file.