Minimum hardware requirements

Minimum hardware requirements

Charge HQ supports multiple different modes of smart charging, with varying minimum hardware requirements. Charging can be controlled based on:

  1. Scheduled periods or variable rate tariffs
  2. Solar generation
  3. Excess solar generation

Whilst some of the charging modes can be combined (e.g. scheduled periods and excess solar generation), the minimum hardware required is based on these three modes.

EV chargers

In all cases, Charge HQ needs to be able to control charging over the Internet. It can either talk directly to your electric vehicle, or, it can talk to the smart wall charger installed in your home. We only need one of these two devices to be compatible, not both.


Note for Tesla owners

For those with a Tesla vehicle, charging is controlled via the vehicle and not the wall charger. If you have a Tesla, it doesn't matter if you charge it with the included UMC (mobile connector), a Tesla HPWC (wall connector) or something else. It is not required or possible to connect Charge HQ to a Tesla charger, because the Tesla chargers are not smart chargers and can't be controlled remotely.

Scheduled charging & variable rate tariffs

Charge HQ can be used to control charging based on scheduled charging windows, and or in response to live wholesale energy prices.

In this mode, Charge HQ requires only a compatible EV charger as described above.

Solar generation

Charging based on solar generation will utilise the gross output of the solar system, any energy used by the rest of the home will be supplied by the grid. See Solar Tracking Settings for more details and configuration options.

At a minimum, to charge in this mode, in addition to a compatible EV charger you need a data feed showing total solar generation. This can be provided by a:

See our list of supported solar inverters. Aside from inverters, Solar Analytics is the only supported energy monitor currently.

Excess solar generation

To charge from excess rooftop solar (energy which would otherwise be exported to the grid), in addition to a compatible EV charger, Charge HQ needs to know how much excess solar energy you have available. It can be provided by the:

You only need one of these devices (not all) to be compatible with Charge HQ.

Battery: Standalone batteries such as the Tesla Powerwall 2 have the required monitoring systems built in and make the data available via an API. If you have a supported battery, it doesn't matter what type of solar inverter you have, you'll be able to use Charge HQ. See our list of supported home battery systems.

Solar Inverter: Most solar inverters that provide a data feed will include the amount of solar energy that is being produced. This is not enough information though, in order to know how much unused or excess solar energy you have available for charging your car, we need to subtract that amount that is being used by the other electrical appliances in your home. Some inverters such as SolarEdge include this monitoring as standard, for others it is available via an optional add-on energy meter, and for some it is not available at all. See our list of supported solar inverters.

Energy Monitor: A standalone energy monitor may be used if the Solar Inverter or Battery are not supported. Solar Analytics is the only supported energy monitor currently.