Homeowners looking to minimize their carbon footprint and reduce their energy costs often buy plug-in electric vehicles (PEVs) in tandem with solar panels. In most instances, any excess solar power produced is sent to the grid at a fixed price per kilowatt-hour or subtracted from the households’s overall power demand via net metering.
However, new residential chargers from electric vehicle (EV) charging equipment manufacturers Etrel and Circontrol have advanced load monitoring features that enable EV charging to automatically be timed with residential solar power production. Both companies exhibited their products at the recent eCarTec conference in Munich, Germany, which featured automotive companies, Tier 1 and Tier 2 suppliers, and EV charging hardware and software companies from across the globe.
Etrel, which hails from Slovenia, continues to impress me with its ability to stay at the forefront of EV charging management technology. When I first met with them nearly 2 years ago, the company had the most sophisticated backend EV software platform. Etrel’s residential Smartcharger is paired with a load monitoring device that senses the power draw from the rest of the home as well as any power being produced by a home solar array. Homeowners can program the Smartcharger to optimize charging for when solar power is being generated, or allow the power to be sold back to the grid if that would have greater economic benefit. The sensor detects the overall household power demand and varies the vehicle charging rate to ensure that the maximum amount of household power draw is never reached.
This feature seems obvious, yet it is only now arriving in residential EV chargers. Etrel’s Rok Kralj said the charger/power monitoring product will be available in 2016. He also said the company has sold several hundred units to date, split between residential and commercial chargers.
Similarly, Circontrol of Barcelona, Spain showcased its eHome residential charger, which also dynamically varies the vehicle charging rate depending on what is going on in the home. The company’s BeOn sensor, due out in January, is coupled with the eHome charger and monitors home energy consumption to make sure that the EV charging rate doesn’t add a load that would surpass the recommended safe level. And as with Etrel’s product, the sensor detects when solar power is being produced and will time EV charging based on customer’s programmed preferences.
Both Circontrol and Etrel include mobile and web applications that let consumers see how much power is being used and generated and also allow them to schedule EV charging. Circontrol offers both commercial alternating current and fast direct current chargers.
Some utilities are similarly experimenting with timing EV charging power output to the level of solar being produced in the area so that customers can similarly boast about driving on 100% renewable power. While this is a premium feature today, power producers can prevent excess wind or solar production from being wasted by aggregating EV charging loads.
Despite operating in a smaller EV market than North America, European EV charging companies including Circontrol and Etrel continue to innovate in the charging market through intelligent hardware and software platforms. It would benefit EV owners if global competitors kept pace with these load balancing features.