The new EG4 314Ah Indoor WallMount Battery sounds like it could just be a bigger version of the earlier releases in their WallMount line of batteries.
However, after running it through a bunch of tests, it became clear this isn’t just a bigger version of the EG4 280Ah 14.3kWh WallMount Battery, it’s a meaningful step forward in how home batteries can be installed, monitored, and managed.
We’ve previously praised EG4 for being one of the few solar brands that actually listens to customer feedback and improves products for real-world users, rather than just making changes for marketing purposes.
The new EG4 314 Amp Hour WallMount Battery leans hard into that philosophy, with a brand-new Gen 3 BMS, simplified commissioning, and some genuinely smart design tweaks.
To find out if this new EG4 battery is actually worth getting excited about, let’s break down what it offers, the results of our performance testing, what we liked about, what we didn’t, and who we think it’s actually for.
Before we dive into the performance tests that we ran on this huge EG4 battery, let’s start by taking a quick look at the core specs:
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We mentioned at the start that we assumed this thing would just be a bigger version of the indoor and outdoor versions of the 280Ah EG4 WallMount batteries, but there actually are some real upgrades under the hood.
Now, it is worth mentioning right away that this is a fairly huge solar battery, both in capacity and weight. It weighs just shy of 300 lbs, so it’s not the type of thing you can easily lift and mount yourself. Still, at 16kWh per battery, these units pack a serious amount of power into an enclosure you have the option to wall-mount.
The Gen 3 BMS (Battery Management System) is the real start of the show. This is the first battery EG4 equipment with this new BMS, and it delivers three major improvements over its predecessors:
For beginners and installers alike, this new EG4 Gen 3 BMS dramatically simplifies installation and commissioning.
We’ll admit that it took us a little while to figure out what we were doing, but once we did, it became really clear that installing, updating, and expanding a system that used these batteries would be a lot easier.
Now that you know what’s new about this battery, let’s see if it actually stood up to real-world use and performance tests:
We set the inverter to push up to 8,000W into the battery and intentionally tried to exceed that. The EG4 314Ah Battery correctly limited incoming power to its rated maximum, preventing overcharge. This is exactly what you want to see from a high-end BMS.
If you were running a large-scale solar panel array and you wanted to make sure that all of the power it was generated actually ended up in your batteries, without overloading them, having an effective and reliable BMS is going to be hugely beneficial.
Efficiency came in at 100%, which is what a battery should deliver. Any real losses typically come from the inverter or wiring, not the battery itself. Still, it’s worth pointing out that the efficiency was exactly where it should be.
EG4 rates the battery for a 12.8kW surge, but in testing we pushed it to around 13.8kW, and it handled it without issues. The LED display seemed to lag slightly, which we kind of expected, but the battery itself delivered the surge power we needed for that load
For starting motors, compressors, or other large loads, like power tools, this performance is excellent.
Now that we’ve explained how it performed, let’s get into all of the things we really liked about this new 16kWh EG4 Indoor WallMount Battery:
Self-identification, automatic protocol setup, and remote firmware updates are huge steps toward truly plug-and-play home batteries.
Given how often beginners find setting up batteries to be one of the most difficult things about building a solar power system, the upgrade EG4 made to their BMS is not something that should be taken for granted. Everything about it makes the installation process easier, even without an actual display screen built into the front of the battery.
Sure, there are still a few kinks, and EG4 still hasn’t released the app that is supposed to work with their Gen 3 BMS, so you have to use the platform on their website, but it’s already showing a lot of positives, even in our early tests.
The charging limits worked perfectly, the efficiency was flawless, and the surge performance exceeded the rating. It sounds like fairly standard praise, but this battery works exactly as it should.
Having tested a huge variety of low-quality solar batteries, we don’t take solid battery performance as a given.
We already mentioned how the new BMS allows the battery to self-identify during setup. These types of user-friendly protocols mean less manual configuration when you are installing the battery, which also means fewer mistakes and getting your batteries up and running a little bit faster.
Even little details, like the addition of an extra terminal lug, are incredibly useful for troubleshooting and unconventional setups, like hooking the battery up to a non-EG4 inverter.
Whether you're a total beginner to backup and solar power system, or you're an experienced installer, you'll save a lot of time and frustration going with a battery that is this easy to install.
Other small details, like the adjustable feet, built-in lifting points, and a simplified enclosure make this battery easy to integrate into real systems.
EG4 has labelled this unit an indoor battery, which we think implies they intend on making an outdoor version, like they did when they released the EG4 WallMount All Weather Battery. Still, this first release even features a built-in battery heater, which turns on at 0°C (32°F), and off at 3°C (37°F).
It’s also UL-listed, so not only is it viable in places like California where UL certification is mandatory, it means it was built with authentic safety features. Even if you don’t need to use UL-listed components, it’s always nice knowing they were designed to meet those standards.
EG4 kept the design extremely simple and practical. The casing is stripped down and functional. There’s no unnecessary fluff, just practical hardware.
The top panel includes communication ports, terminals, and dry contacts, plus that additional lug terminal we mentioned above. That extra lug is surprisingly useful, and we were able to clamp directly onto it to force-charge the battery during testing, something you can’t easily do with quick-connect terminals alone.
The adjustable feet we mentioned above aren’t just useful for making sure the battery is level on the ground (assuming you don’t want to wall-mount it), they’re also important for compatibility with the EG4 BOSSBox ESS Enclosure.
Even when we first unboxed it, one of the first things we noticed was lifting eyelets and a rope that allows you to safely hoist the nearly 300lb unit out of the box. These are small details that cheap battery manufacturers would never consider.
It’s just really obvious that EG4 took their time when they were designing this thing.
With all of that said, no solar battery is perfect, and this brand new 314Ah EG4 Wall Mount Battery is no exception. Here are the main issues we found with it:
Instead of including a detailed display screen, you get basic status lights. That makes troubleshooting harder if you’re standing in front of the battery without a laptop. The LEDs are better than nothing, but we always prefer when a battery has its own dedicated screen.
A lot of the new Gen 3 BMS functionality will be accessible through the new app, but it wasn’t available at the time we got our hands on this battery. The apps that EG4 has released in the past have all been user-friendly and practical, but as of now, you’re stuck using the remote monitoring portal on the EG4 website, which works best on a computer, rather than a phone or tablet.
This is a pretty superficial gripe, but the antenna sticks out of the side of the battery like an old car antenna. It works, but it looks weird, and almost feels like a temporary solution compared to coming up with some sort of integrated alternative.
This isn’t exactly a criticism of this specific battery, but wall-mounted batteries can eat up a lot of wall space. When you compare it to a series of server rack batteries in a cabinet, these large wall-mounted batteries are significantly less space-efficient.
If you are planning on building out a large solar power system with a high-capacity battery bank, you may want to go the server rack battery route. Given they’ve been out for a while now, you could probably get more bang-for-your-buck if you went with several EG4 LL Server Rack Batteries as well.
This battery is ideal for:
With 16kWh per unit and the ability to parallel up to 32 of them, this battery can scale from a small backup system to a whole-home powerhouse.
The EG4 314Ah Indoor WallMount Battery feels like a real evolution of EG4’s previous wall-mounted battery releases. The capacity bump is nice, but the Gen 3 BMS and simplified commissioning are the real reasons this battery stood out to us.
If you can afford it, this is one of the most user-friendly, high-capacity home batteries we’ve tested. It’s not the cheapest option out there, but it’s still way more affordable than something like a Tesla Powerwall 3. It’s also very powerful, scalable, and clearly designed with real-world users in mind.
If this is the direction EG4 is heading with their upcoming batteries, we’re excited to see what comes next.
We test solar products so you don’t have to. Check out our opinions and which units we think are worth your money and which ones aren't.
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