Here at The Solar Lab, we’ve had our hands on plenty of solar batteries, and while they’re not exactly the most exciting pieces of equipment to review, this sleek EG4 WallMount Indoor Battery actually impressed us quite a lot.
We had already spent months testing the outdoor version, so we were pretty excited to get our hands on this slimmer and cheaper indoor version. But is it really the right battery for you?
Let’s dive in and find out what the deal is with this 14.3kWh powerhouse. Spoiler alert: it might be even better than the outdoor version!
Before we dive into the results of our testing, let’s start out with a quick overview of the design and specs for this battery.
As you can probably guess, the EG4 WallMount Indoor Battery was designed for indoor use, which explains why it is slimmer and slightly cheaper than its outdoor sibling. It still comes equipped with the self-heating mode you get with the outdoor version, but it doesn’t need that thick, weather-proof exterior.
While it's slimmer than its outdoor sibling and actually looks really sharp, this thing is not a lightweight. In fact, it actually fails the Tiny Baby Lift Test. Tiny Baby claims he could bench press its weight 10 times, but he could barely get it an inch off the ground without straining. In other words, you’re going to need at least two people to set this thing up.
It boasts a 14.3kWh storage capacity, and it is rated for 8,000 cycles at an 80% depth of discharge. You also have the option to parallel up to 64 units for an insane 915.2kWh combined storage capacity!
Like the outdoor version, it’s also UL listed, meaning it meets the stricter safety requirements needed for it to be used in California. On top of that, EG4 backs this bad boy with a 10-year warranty, which is really impressive for any battery, nevermind one this big. Typically, we see 5-year warranties at best with these bigger battery banks.
It also comes with adjustable feet, allowing you to level it out on uneven ground. The built-in display screen is incredibly user-friendly, and it’s surrounded by a green indicator light, allowing you to quickly read the remaining power from a distance.
You also get a dedicated power button on the left, and a well-organized array of battery connections and communication ports on the top, which make it really easy to install and set this unit up.
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As for the rest of the specs, here’s a quick breakdown:
Now that we’ve covered what this thing is supposed to do, let’s see how it actually worked out when we tested it in the real-world.
The EG4 WallMount Indoor Battery is supposed to deliver a continuous discharge at 200 amps, which means it can power heavy loads of up to just over 10,000 watts. In our testing, it was able to do so with no problems. We ran it in all kinds of different scenarios and it could have run all day with that type of load.
It’s supposed to be capable of surging up to 15.4kW for 3 seconds, so that was the next thing we wanted to test. To really put it through its paces, we plugged in our massive 15kW shop heater and the battery was able to run for about 10 seconds. This blew us away and means it exceeded the advertised specs.
We kept pushing this thing and got it up to the point that we were running a 195-amp load (basically its continuous 200-amp rating) and it still managed to surge and start our massive shop compressor. It’s a 10,000W surge, so this thing had to surge to like 400 amps for a few seconds, which is just crazy. For context, even the EcoFlow Delta Pro Ultra (rated at 7,200 watts) couldn’t do that when we tested it.
Just as a quick recommendation, if you were going to pair the battery with something like the EG4 18KPV Inverter, then use this combination to run demanding loads regularly and for long durations, you’d probably want to invest in two of these batteries.
Unfortunately, this battery is just way too bulky to fit in the deep freezer we use for some of our tests, and the weather outside has really been warming up lately. This meant we couldn’t really put the self-heating function to the test for this indoor unit; however, we had previously tested it with the outdoor version of the battery.
According to EG4, both the indoor and outdoor versions are equipped with the exact same self-heating function, and it’s only really the weather-proofing that separates the two batteries. Given that we tested the self-heating for outdoor version in sub-zero temperatures, ranging from -18° F (-1°C) to -28.8°F (-20°C), and it kept running even in these extreme conditions, there’s no reason to expect the indoor version to perform any less reliably.
There’s not much more to say other than the fact that the rapid shutdown feature works. It’s a tad slower than we would have liked, usually shutting off within about 30 seconds, but that’s still fast enough to meet the requirements for California, which are a lot stricter than pretty much anywhere else in the United States.
As for efficiency, we tested it, and, just as any self-respecting battery should be, we’re happy to report that it’s 100% efficient.
Now that we’ve covered our first impressions and how it held up during our testing, let’s take a look at some of the pros and cons for the indoor version of this battery:
It sounds a bit weird for a battery, but one of our favorite things about this unit is actually the display screen. The interface is easy to navigate and shows key information like battery percentage, voltage, and runtime at a glance. It’s really clean and really intuitive.
The added green indicator light around the logo also allows you to check the charge state from across the room. We’d probably have to say it’s one of the best displays we’ve seen from EG4, which isn’t something we can say we expected to see on a battery.
The battery’s slim and sleek design is a definite plus. With adjustable feet to level it on uneven floors (like we have in our wonky house), quick cable connects, and a streamlined look, even without the conduit box, it’s both attractive and functional.
Whether it’s handling a continuous 10,000-watt load or surging to start heavy-duty equipment, this battery performs better than expected (and advertised). Like we said, it managed to start a massive compressor by surging to around 400 amps for a few seconds, which is just insane!
With rapid shutdown, fire arresters, and a UL listing, it’s built to meet the strictest safety standards. Plus, the self-heating function has proven its worth in sub-zero temperatures (based on our experience with the outdoor version). Preventing the battery cells from freezing can only help extend the overall lifespan of this impressive battery.
The fact it is carried by Signature Solar means that you actually get really friendly, domestic-based support when you need something. When you call the support lines for some of the other retailers and manufacturers, you’re lucky if anyone picks up, and if they do, they’re probably going to be difficult to understand (if they even speak English).
On the other hand, when you call Signature Solar or EG4 for support, you’re greeted by a friendly Texan. Plus, they back it with an impressive 10-year warranty, so you’re covered if you ever run into any issues down the line.
Look, we know it’s a high-capacity battery, so it has to be heavy by design, but the 282 lb weight can really complicate the installation process. The fact it even made Tiny Baby question what he can do in the gym is saying something.
However, EG4 includes braided rope handles, making it easier to lift the unit and get it out of the box. Just make sure you’re not trying to lift it on your own, otherwise, say goodbye to your back.
While it meets the required safety standards (shutting down within about 30 seconds), the rapid shutdown feature is a tad slower than we’d ideally like. It works, but it isn’t as lightning-fast as we figured it would be—it’s called rapid shutdown, after all.
Both the indoor and outdoor versions of the EG4 WallMount Battery really impressed us and delivered stellar performance. Which version you choose will basically just come down to your own needs.
If you’re planning to keep your battery bank inside at all times, we’d say this indoor version is hard to beat. It offers the same impressive level of performance, has a sleeker design, and it’s also a bit cheaper, so you can save some cash.
At $3,134 with our discount code, it may not seem like a steal, but that’s actually a really good price when you consider its capacity and all of the extra features you get with it, like self-heating and a really intuitive display screen. Overall, it gets two thumbs up from us!
Signature Solar: https://signaturesolar.com
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Signature Solar: https://signaturesolar.com
Get $50 OFF with Discount Code THESOLARLAB50
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