Connect with us

Hi, what are you looking for?



Tesla Owner Hacks The Tesla Wall Connector To Charge On Sunshine

One enterprising Tesla owner hacked together a homegrown solution to charge his Tesla only when his rooftop solar system is producing energy, allowing him to drive on sunshine.

One enterprising Tesla owner hacked together a homegrown solution to charge his Tesla only when his rooftop solar system is producing energy, allowing him to drive on sunshine.

To do this, he tapped into the capability of the Tesla Wall Connector, allowing it to run in “servant” mode. This mode is meant to allow owners with two wall connectors to have them share a single circuit and regulate their combined current draw. This is done by putting the second wall connector in servant mode, where it then looks to the “master” wall connector to determine how much power it can draw.

This is done by setting a dial inside of the Tesla wall connector and connecting up the built-in RS485 control bus. The two wall connectors can then talk across the RS485 bus.

YouTuber CWNE88 tapped into the functionality of the RS485 bus, which had already been explored quite extensively, and rolled his own version of a controller in the form of a Raspberry Pi, which is essentially just a super compact computer that can run a variety of operating systems and be used for a number of fun projects.

The end result is a nice little controller that runs off of the Pi and talks to his home Tesla Powerwall to determine how much solar is being generated. Armed with this information, the Pi is then able to dynamically set the charging speed of the Tesla wall connector to match the output from the solar system.

The system he created presets all of this information to the homeowner via nice little web front end that allows him to manually select a charging speed, select “green charging,” or even to turn charging off completely.

I love just how much fun people are having exploring ways to create the future they want to live in, today. Tesla’s smart devices are enabling much of this functionality in ways that I’m sure we’ll see rolled into its products in the future as Tesla continues to integrate all of its products across its energy storage, solar production, and automotive product lines.

Check out the video below and the description below the video (on YouTube) to learn more about the build and the code.

Appreciate CleanTechnica’s originality? Consider becoming a CleanTechnica Member, Supporter, Technician, or Ambassador — or a patron on Patreon.

Have a tip for CleanTechnica, want to advertise, or want to suggest a guest for our CleanTech Talk podcast? Contact us here.

Written By

I'm a tech geek passionately in search of actionable ways to reduce the negative impact my life has on the planet, save money and reduce stress. Live intentionally, make conscious decisions, love more, act responsibly, play. The more you know, the less you need. As an activist investor, Kyle owns long term holdings in BYD, SolarEdge, and Tesla.


You May Also Like

Autonomous Vehicles

Background: My wife and I have been driving our Tesla Model 3 for ~2.3 years. We commute 1500 miles between our homes in Utah...

Electric Cars

There was a time when traditional automakers could have stymied Tesla’s growth story. Is it possible they missed their window? Christiaan Hetzner at Fortune reports,...


The Insurance Institute for Highway Safety (IIHS) revealed the results of its Tesla Model Y crash safety tests recently. Like all Teslas, the Model...


Last month, I wrote this article comparing Tesla’s Q3 2021 accident data with the National Highway Traffic Safety Administration’s (NHTSA) report Early Estimate of...

Copyright © 2021 CleanTechnica. The content produced by this site is for entertainment purposes only. Opinions and comments published on this site may not be sanctioned by and do not necessarily represent the views of CleanTechnica, its owners, sponsors, affiliates, or subsidiaries.