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If you're using Amber as your energy retailer, Charge HQ can integrate with your individual account so that it's aware of your live wholesale pricing.
To enable the Amber integration, follow the setup guide.
Once you're connected to your Amber account there are three important controls to make use of: Max Price, Min Renewables and Scheduled Charging.
If you have rooftop solar, Charge HQ will always attempt to charge from the excess or gross solar production (unless the Do Not Charge Price limit is exceeded, see this FAQ), and this is often the cheapest and best time to charge if you can. Follow the guides on for setting up your solar hardware, and configuring solar tracking.
On the home screen set your charge limit to 90%, and solar charging will charge up to this level when possible.
For many users, rooftop solar won't always provide sufficient charge and so a top-up from the grid will be needed. You can use the Always Charge price to take advantage of low grid price periods or via Scheduled Charging as described below.
The Do Not Charge Price, Always Charge Price and Min Renewables settings do apply when charging from rooftop solar. You can read a high level description or a more detailed discussion of how they impact charging.
Charge HQ can take advantage of periods of low prices or high renewables generation when charging from the grid.
Set an Always Charge Price and Charge HQ will charge your EV whenever your Amber price is below this level, e.g. $0.10/kWh.
Similarly, you can set a Minimum Renewables value (say 40%) and charging will be stopped whenever renewables generation on the grid falls below this level.
For both values you can keep an eye on your Amber app, or use OpenNEM.org.au to get a feel for average prices and percentage renewables in the grid. Keep in mind that they will fluctuate during the year.
If you're not getting enough charging when power is cheap or renewables are high, you can keep tweaking your settings, or configure a Scheduled Charging period to ensure your EV maintains the minimum level of charge you need for your regular driving.
The Do Not Charge Price is not utilised for users without rooftop solar.
Charge HQ will always start charing at the beginning of this charging window if the EV requires charge. To minimise charging costs with Amber, it's best to set this time to coincide with a period that energy is most often cheap (or if you prefer, when renewable generation is high).
A guide to finding your cheapest time to charge:
Alternately, if you want to maximise charging from renewable energy, you can pick a time that coincides with maximum renewable energy generation on the grid. This is generally during the day in most states.
Next, consider how much charging you want to do during this scheduled charging period.
Head over to our guide on Scheduled Charging for step by step instructions on setting it up.