Some households run the risk of overloading their main electricity supply and tripping the main circuit breaker.
Charge HQ could be enhanced to provide a load management feature which limited the EV charging power when required to avoid tripping the main breaker.
This feature would operate any time the EV is charging, in any mode, and would reduce the EV charging power in response to other household loads to keep the total grid import below the rating of the main supply breaker.
I have tried to do this from my Tesla 2 power wall controller without success from the Tesla support group. Still waiting after 6 months. I was told by a Tesla representative this could set up in the Powerwall controller. I have had a main breaker drop twice. Not convenient when you are not at home.
Having just installed another Powerwall2 this would be a great feature. While the max charge amps is a good inclusion, taking this one step further and having a user specify their Main Breaker rating and ensuring that total load is never exceeded would be a big help. Being on a retail energy EV plan I get free charge hours on weekends and with one home battery this was great to top up the battery and also charge the car at full charge circuit supply of 30A. Now with 2 batteries the Tesla system charges these at 10kW (was 5kW) and will then try to reach the max charge rate for the car regardless of whether excess PV is available or not during the free power ‘window’. I quickly learnt this will trip the main breaker during both the weekend free times and also during off-peak charge periods when the batteries and car are typically topped up. I presently juggle this in real-time (when I remember) by setting the max amps in ChargeHQ to what will stay within the main breaker rating based on 10kW for the batteries, what home load is and the solar available is so that the incoming is less than breaker rating. ChargeHQ could potentially (?) do this if it knew what the main breaker was rated at and then ensure the charge current was kept at an appropriate and adjusted level to stop tripping. Could a future feature look at this?
