Smart Charging via House Solar



Offer a better way to take advantage of excess solar power from a house solar array. Some ways this could be done include:

  1. Monitor the solar power generation and use all excess power (that is normally returned to the grid) to charge the car.
  2. Have a start/stop time, so charging occurs between rough solar generation times like 9 am to 5 pm.
  3. Use local weather data and sunset/sunrise to select a range of times for daytime charging during peak sunshine.


Many solar inverters “broadcast” via WiFi the solar output, which might be used directly by the car to take advantage of available solar power. Better would be to monitor the house’s power usage vs. solar generation with a WiFi system like Neurio W1-HEM with a Solar expansion kit and have the car charge based on excess energy production.



(edited by moderator)

Category: Tags: entered 28-Apr-2017


alternative that the charging station change how much the car are allowed to use

then all cars at that location will use the correct level
Solar charging needs information from the electricity meter or from current transformers to regulate the charging to use the solar surplus power that would otherwise be fed into the grid. The same mechanism should also enable Smart charging to ensure the total household consumption stays below the main fuse limit. Both Solar- and Smart Charging must also cater for three phase installations such as in Europe.
In the UK you are paid for all the electricity you generate, all of which it is assumed will go to the grid. If you use the electricity you have generated yourself it is effectively FREE - so there are big savings to be had by sucking off amps throughout the daylight hours. I set my charging amperage to 5 amps to benefit from most of the solar panel output!
I'd expect this to be a feature of the solar power management station/controller
Controller of my solar panels has an API for this. But you might as well use that API to control (enable/disbale) the power to the charging cable.
Monitoring the voltage might be enough is a lot of cases. With the 230V system here while charging I see it rising to 236V when the sun shines brightly ... and dropping to 225 at night.

Reducing the charge amps when the voltage drops and increasing when it gets above the average again seems an easy algorithm to implement.