Clever wallbox hack: ESP8266 automatic charging system for solar power

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KfW funding for wall boxes makes in-house charging terminals more attractive than ever. Anyone who has already installed a photovoltaic system can charge their car with solar power free of charge. The prerequisite, however, is an intelligent control system – if this is missing, you can simply retrofit our ESP8266 automatic loading system.

In the new Make 5/21 we are making the wallbox clever: when the sun is shining and the PVA is producing a lot of electricity that would otherwise be returned to the energy supplier, charging is switched on. The charging current for the e-car is reduced if other consumers in the house draw electricity or the weather becomes a little cloudy. If desired, it can be switched off completely if the solar cells no longer supply anything worth mentioning.

In our construction proposal, an energy meter with a WLAN interface determines current, voltage and phase position at the transfer point; a simple ESP8266 module reads the current energy flow and controls the charging current of the wallbox based on the measured values, also via WLAN. As simple as that!

More from Make

More from Make

More from Make

We love IKEA hacks. Anyone who dares to venture into the furniture store despite the scented candles and Stehrümchen department will sometimes find hacking gems with astonishing practical value: For example, an air filter that is waiting to be controlled with our CO₂ traffic light, or the fine dust sensor Vindriktning, which is very easy with an ESP8266 is connected to the home IoT.

There is more on the subject in issue 5/21 of Make.

Issue 5/21 of Make is available online and at the kiosk. With one of our subscriptions the notebook was already in the mailbox. You can also use the make conveniently as a Order the print version or PDF in the Heise Shop, even free shipping until October 8th. If you’d rather read Make digitally, you can in our apps for iOS and Android. You can also find the table of contents for Make 5/21 online.


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