Rendering of what Tesla's new 'Drive on Sunshine' feature may look like
Not a Tesla App
Tesla is getting ready to introduce a new feature that allows owners to charge their cars using surplus solar energy. If your home is generating more energy than it's using, this excess energy can be directed automatically to your car.
For owners of solar panels, there have been limited options when your panels are generating more energy than you're using. The system tops off your Powerwalls if you have them, but once those are full, the system sends any excess energy back to the grid.
However, if you have a Tesla, you'll soon be able to automatically start charging your vehicle whenever excess energy is being generated. This is according to new text-based information found in the latest Tesla app, according to Twitter user Tesla App iOS. Tesla is calling this new feature "Drive on Sunshine," which focuses on providing the cleanest charge possible for Tesla vehicles.
Tesla has already started updating their app with some details regarding this new feature. The feature will instruct users to plug in at home during daytime hours, to take advantage of the surplus clean energy their solar system produces.
How It Will Work
The Tesla app allows you to set a charging limit for your vehicle. However, once this new feature is enabled, you'll gain access to two charging sliders. The first slider will control how much your vehicle is charged, regardless of where the energy is coming from. You'll be guaranteed to have this amount of charge every night. However, you'll have access to a new slider that lets you set the maximum charge level, but only using your solar system's clean energy.
This will allow you to set your charging limit to a minimum amount every day, such as 60%. You could then set your solar limit to something much higher, such as 90%. This will allow your vehicle will charge up to this limit when your solar system is producing excess energy.
By setting charge limits and specifying the desired charging times and locations, Tesla owners can ensure that their vehicles are being fully charged before excess energy is sent to the grid.
Apple Inspired?
Last September, we pondered if Tesla could develop something similar to Apple's Clean Energy Charging. Apple optimized iPhone charging times by prioritizing clean energy sources from the grid. This approach aligns with Tesla's mission to create zero-emission vehicles that can charge using clean, renewable energy.
The app also lets users charge their vehicle's battery using available energy sources for regular daily driving needs while reserving a portion of the battery to be charged exclusively when surplus solar energy is available.
Explains Recent Powerwall Announcement
This new functionality enables Tesla owners to charge their cars using renewable solar energy, reducing the reliance on fossil fuels throughout the charging and driving experience.
Tesla's goal is to make EV ownership as sustainable as possible by minimizing the use of fossil fuels and promoting clean charging options. When a household generates more solar energy than it can consume, this excess power can be directed toward charging the vehicle. Tesla again began offering the Powerwall as a standalone product, allowing customers to purchase the battery storage system without requiring a solar array.
The Drive on Sunshine feature is a major step forward in Tesla's mission to make electric vehicle ownership as sustainable and environmentally friendly as possible. With this update, Tesla continues demonstrating its commitment to creating a cleaner, greener future for all.
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Tesla’s been on a roll with Supercharger improvements lately, from the 325kW charging update for the Cybertruck, to 500kW with V4 Superchargers coming next year. While those improvements have been limited to the Cybertruck, Tesla didn’t put all their focus on their new flagship vehicle, but looked at their more affordable vehicles as well.
LFP Battery Heating
Tesla’s Superchargers can now heat LFP Batteries - those that are in the Model 3 and Model Y Rear Wheel Drive variants. This applies to Long Range and Standard Range models, which saw a limited run. This is another update included as part of the 2024 Tesla Holiday Update - which really arrived with a lot of unannounced new features and capabilities.
The change is pretty interesting - Superchargers of the V3 and V4 variety can now pre-heat batteries for Model 3 and Model Y vehicles equipped with LFP battery packs. That means those vehicles are able to get back on the road faster when it's extremely cold. Of course, Tesla still advises you to precondition before you arrive, saving drivers time and money.
Max de Zegher, Tesla’s Director of Charging, also commented on the new feature. Essentially, Tesla is inducing an AC (alternating) ripple current through the battery to warm it up. Keep in mind that Superchargers are DC charging. That means it is possible to get a cold-soaked LFP vehicle on the road 4x faster than before, assuming that it didn’t precondition at all and that it is in the worst-case scenario (below 0ºF).
In essence, Tesla is using some engineering magic to turn the circuits inside the LFP battery into an electric heater - and powering that heater through the Supercharger. An AC ripple current is a small oscillation in the DC charging current that generates heat through electrical resistance, warming up the battery. Those ripples are a byproduct of converting AC to DC and back - so Tesla is using the onboard charger to induce those ripples to warm up the battery. Definitely an innovative technique that’s really only possible with the versatility of the NACS connector.
We’re hoping Tesla can implement this across their full lineup of vehicles, but we’ll have to wait and see how it is trialed across LFP vehicles first and if it is even possible on vehicles with 2170 or 4680 battery packs.
Tesla launched two FSD updates simultaneously on Saturday night, and what’s most interesting is that they arrived on the same software version. We’ll dig into that a little later, but for now, there’s good news for everyone. For Hardware 3 owners, FSD V12.6.1 is launching to all vehicles, including the Model 3 and Model Y. For AI4 owners, FSD V13.2.4 is launching, starting with the Cybertruck.
FSD V13.2.4
A new V13 build is now rolling out to the Cybertruck and is expected to arrive for the rest of the AI4 fleet soon. However, this build seems to be focused on bug fixes. There are no changes to the release notes for the Cybertruck with this release, and it’s unlikely to feature any changes when it arrives on other vehicles.
FSD V12.6.1 builds upon V12.6, which is the latest FSD version for HW3 vehicles. While FSD V12.6 was only released for the redesigned Model S and Model X with HW3, FSD V12.6.1 is adding support for the Model 3 and Model Y.
While this is only a bug-fix release for users coming from FSD V12.6, it includes massive improvements for anyone coming from an older FSD version. Two of the biggest changes are the new end-to-end highway stack that now utilizes FSD V12 for highway driving and a redesigned controller that allows FSD to drive “V13” smooth.
It also adds speed profiles, earlier lane changes, and more. You can read our in-depth look at all the changes in FSD V12.6.
Same Update, Multiple FSD Builds
What’s interesting about this software version is that it “includes" two FSD updates, V12.6.1 for HW3 and V13.2.4 for HW4 vehicles. While this is interesting, it’s less special when you understand what’s happening under the hood.
The vehicle’s firmware and Autopilot firmware are actually completely separate. While a vehicle downloading a firmware update may look like a singular process, it’s actually performing several functions during this period. First, it downloads the vehicle’s firmware. Upon unpacking the update, it’s instructed which Autopilot/FSD firmware should be downloaded.
While the FSD firmware is separate, the vehicle can’t download any FSD update. The FSD version is hard-coded in the vehicle’s firmware that was just downloaded. This helps Tesla keep the infotainment and Autopilot firmware tightly coupled, leading to fewer issues.
What we’re seeing here is that HW3 vehicles are being told to download one FSD version, while HW4 vehicles are being told to download a different version.
While this is the first time Tesla has had two FSD versions tied to the same vehicle software version, the process hasn’t actually changed, and what we’re seeing won’t lead to faster FSD updates or the ability to download FSD separately. What we’re seeing is the direct result of the divergence of HW3 and HW4.
While HW3/4 remained basically on the same FSD version until recently, it is now necessary to deploy different versions for the two platforms. We expect this to be the norm going forward, where HW3 will be on a much different version of FSD than HW4. While each update may not include two different FSD versions going forward, we may see it occasionally, depending on which features Autopilot is dependent on.
Thanks to Greentheonly for helping us understand what happened with this release and for the insight into Tesla’s processes.