I tested a solar smart lock that never needs to be recharged — but there's more to it than just endless battery life

Unlocking your smart lock from your phone is cool, but the real challenge now is ironing out the practical issues that come with making your lock smart — like having to keep it powered when you never had to worry about that before. A few newer locks are trying to solve this, and the Desloc V150 Plus might be the most interesting attempt.

The V150 Plus has a solar panel built right into it, designed to charge the lock so you never have to think about whether it has enough juice to let you in. It doesn't skimp on other features either -- you get fingerprint and facial recognition unlocking, so it's easy to get through your door without pulling out your phone.

So how well does that solar panel actually perform, and is this one of the best smart locks outside of that? I've been using the Desloc V150 to find out.

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Price and availability

The Desloc V150 Plus is now available through a Kickstarter campaign, and Desloc says that it will be available from retailers starting in August. The Kickstarter lists the lock as being around $169 though, so if you know you want it, it may be worth buying through the Kickstarter.

Design and setup

For the most part, the Desloc V150 Plus looks much like other smart locks — until you look a little closer. Like other smart locks, the exterior portion is rectangular and made of a combination of black metal and plastic. But unlike many other smart locks, when you approach it, a pin pad won't illuminate for you to punch in a code. That's because the surface on the front of the lock isn't a pin pad at all — it's a solar panel that charges the built-in battery.

Apart from the 4.8-inch solar panel, the lock also has a fingerprint sensor towards the bottom and two cameras towards the top that are used for facial recognition. In other words, while there's no pin pad, there are still multiple ways to unlock the door.

The interior portion looks even more like other smart locks. There's a thumb latch to manually lock and unlock the door, along with a cover for the main battery, which hopefully you'll never have to actually open.

The lock should be able to survive most weather with its IP65 rating. Plus, it has BHMA Grade 3 certification for deadbolt strength.

This is a full deadbolt replacement, not a retrofit overlay. You'll remove your door's original deadbolt, align the new tailpiece with the latch, and mount the exterior and interior assemblies. Once it's powered, the lock runs a calibration routine to learn the bolt travel and ensure smooth locking, after which you can test the interior thumb-turn. None of that is unusual, and Desloc's installation process on previous locks has been straightforward enough.

Once you've physically set up the lock, you'll download the Desloc app and create an account, or sign in if you don't already have one. From there, you'll be able to add your face for facial recognition and add your fingerprint for the fingerprint scanner.

App and smart home

The V150 Plus runs on Desloc's existing app, and it connects to Wi-Fi and Bluetooth without the need for additional hubs.

For the most part, I found the app easy to use. I was able to add fingerprints and faces without issue. Plus, I could remotely lock or unlock the door with it. You'll also get real-time access logs and battery information, which, again, hopefully you'll never really need to see.

Another thing that the app shows, which is only really interesting for a solar-powered model like this, is how much power it gets each day. The app also includes a "Landlord mode" for rental scheduling and access-profile management, built around a calendar-style interface for organizing tenant codes and monitoring usage.

Combined with the self-charging design, that could make the V150 Plus genuinely appealing to small landlords, since the solar system would cut down on site visits just to swap batteries — though of course that might introduce complications around accounts and unlocking methods; since there's no keypad, each new tenant would have to register either their fingerprints or face.

Auto-lock, meanwhile, ties into a door-closure sensor so the lock only engages once the door is fully latched -- a subtle detail, but an important one, because it prevents the false sense of security you get from a lock that fires before the door has actually closed.

On the smart-home side, the lock integrates with Amazon Alexa and Google Home for voice control, but that's it, which is pretty disappointing. Unlike cameras, locks have been supported in the Matter spec for some time now. And at this point, there's really no good excuse for smart locks not to support Matter. Without Matter support, you won't be able to use the Desloc V150 Plus with Apple HomeKit or other smart home standards beyond Alexa and Google Home.

Performance and battery life

Perhaps the most important aspect of this lock, of course, is how its battery and charging system works. I found it to work perfectly well. When I first set up the lock, I skipped the instructions to fully charge the battery, and the app reported that the battery had 12% left.

After around a week, it was at 34%. In other words, it doesn't charge all that quickly, but if I had fully charged the battery when I first set up the lock, I would never really need to worry about the lock running out of juice, and would expect that it would retain near 100% of its battery at all times. I had the lock set up in a location that doesn't get tons of direct sunlight, but it does get a few hours per day. It also has a USB-C port for emergency power if, for example, the battery stops working.

I did find, unfortunately, that the fingerprint scanner and face scanner were somewhat slow, but they did work the majority of the time. It usually took a few seconds for the face scanner to recognize me, and I actually found that it was faster to use the fingerprint scanner. What that means is that while the face scanner is a nice feature, it's perhaps likely to be treated as a backup for when you're carrying something, rather than as the primary way to unlock the door.

Verdict

The Desloc V150 Plus is a perfectly fine lock, but needs a bit of refinement before it can compete with the best smart locks. Obviously, the fact that you'll never have to manually replace the batteries or charge it is a nice feature. But without Matter support, it's limited in the smart home ecosystems that it works in.

Plus, it unlocks relatively slowly, especially compared to plenty of other smart locks out there. Again, it's not a bad product. For the right person, it might be the way to go, especially for those in the Google or Amazon ecosystems, or who don't mind using the dedicated app.

If you're looking for a lock with a built-in solar panel, the Lockin Veno Solar is Matter-compatible, comes with either face or palm unlocking, and has both a keypad and a physical key slot, making it feel like a more complete product.