RUiXU 48V Server Rack Battery Review – Can it Compete with EG4 Batteries?

Oct. 17

Over the last year, there’s been a lot of buzz on YouTube about the new RUiXU 48V server rack battery. A few years back, RUiXU had a less-than-stellar reputation for carrying poor quality batteries that some claim verged on being a “scammy” product, but the brand has apparently come a long way since then.

While we don’t have any experience with those older models, we do have our hands on the latest version, and it’s time to see how it stacks up against some of the heavyweights, like the server rack batteries in the EG4 lineup.

As you know, here at The Solar Lab, our opinions can’t be bought. To make sure we offer you a fair and unbiased review, we’re going to run the RUiXU’s 48V 100Ah server rack battery through a series of tests and then explain how it actually performs. Plus, after having this thing in The Lab for just shy of six months, we feel we have some pretty valuable insights about the battery itself, as well as the brand that makes it.

So, is the RUiXU a worthy competitor to the more popular server rack batteries from EG4? Let’s find out.

Quick Breakdown of the Specs

Before diving into our own thoughts about it, here’s a quick breakdown of the RUiXU 48V server battery.

This battery weighs in at a hefty 103 lbs, so it just barely passes the “Tiny Baby Lift Test”. Like most server rack batteries, it’s probably going to be the type of thing you only lift when you’re first setting it up, then you just leave it alone.

The battery holds 5.12 kWh (51.2 volts at 100 amp hours) and uses lithium iron phosphate (LiFePO4) cells. RUiXU, or “R-Bomb”, which is just easier to say than RUiXU, claims it’s rated for 6,000 cycles at a 90% depth of discharge. This R-Bomb battery can also connect to up to 32 other batteries, giving you a massive expandability potential of up to 160kWh—pretty insane stuff.

The internal Battery Management System (BMS) includes all of the standard protections you would expect, including basic overcharge and temperature safeguards, but the basic model we tested isn’t self-heating. If you live in a cold climate, they do offer a self-heating version, it just costs a bit more cash.

Testing the Battery’s Performance

Now onto the fun part: the testing. “R-Bomb” claims this battery is rated for 101 to 119 amps for up to five minutes, so we tested it at 117 amps. It held strong for just over four minutes—pretty impressive. They also claim it can handle 120 to 149 amps for 15 seconds. At 140 amps, it lasted around five seconds—decent, though not quite hitting the higher end of the claimed rating.

Next, we ran an efficiency test. As a 100Ah battery, under a 96-amp load, it should have lasted about 62.5 minutes. It actually lasted 66 minutes! This is a great sign—it’s clearly efficient and even performs better than advertised in this regard.

We personally live in a cold climate, so we wanted to make sure the battery’s BMS temperature cut-offs worked as promised. After sticking it in a freezer for 24 hours, we got it down to an ice-cold -25°C. The moment we tried to turn it on, the alarm light lit up and it refused to charge or discharge. This is excellent news: the BMS works as it should, protecting the battery from damage in extreme cold. Once it thawed out, the battery worked just as well as it did before we froze it.

Assessing the Battery: The Good, The Bad, and the Terrible Customer Support

As mentioned, we’ve had this thing for nearly six months, and in that time, we’ve tested it out quite a bit. Here’s a quick overview of what we like and dislike about the RUiXU Server Rack Battery:

The Design:

The RUiXU’s design is a bit of a mixed bag. On the plus side, this battery is slimmer than many competitors, including the EG4 LL 48V Server Rack Battery. This is great for maximizing rack space. The insulated terminals are another highlight, making it easy to clip wires on and off without worrying about accidental shocks or damaging the terminals themselves. We also liked the communication ports in the middle of the unit, making cable management easier when stacking multiple batteries in a rack.

However, the design has its shortcomings. There’s no breaker, just a small on/off switch, which can freeze up in cold weather due to the plastic design. We also didn’t love the lack of a display screen or Bluetooth support—features that seem like no-brainers in modern batteries. Without these, it’s impossible to check things like battery percentage or amperage without external tools. It feels really outdated.

Build Quality:

The battery feels really solid, and, after six months of testing, it works just as well as the day we unboxed it.

Peeking under the hood, the internals also look well-made and well-designed. The cells are neatly strapped down, and the build quality is top-notch. That being said, there are no fire arrestors, which are common in some other brands, like EG4, and they really do provide added peace of mind.

The temperature sensors are built into the BMS, though we couldn’t find where they were actually connected to the individual cells. Overall, it’s a really well-constructed battery, but seems to lack a few of the extra safety features you get with some of the pricier batteries.

The Customer Support Fiasco:

Now, let’s talk about where things got really ugly—reaching out to their customer support lines. We’ve noticed other reviews of RUiXU products mention how the reviewers are unsure how helpful the customer support would be, so we really wanted to dive into that and see for ourselves. It was an interesting experience to say the least.

Basically, there are three ways to contact “R-Bomb”: email, phone, and, weirdly, a WhatsApp number. Tiny Baby sent RUiXU an email with a basic question about their battery’s inverter compatibility. The email instantly bounced back because, hilariously, they misspelled the word “battery” in their own company email address. After “correcting” the email address to contain their version of the word battery, three business days passed with no reply. Not great.

Next, we tried calling the number they had listed for their customer support phone line, which turned out to be a Chinese phone number (not overly surprising, but we knew this meant it wasn’t going to go smoothly). We called and, unsurprisingly, got absolutely nowhere.

Finally, there was that weird WhatsApp number, and this is where things got...weird. Tiny Baby messaged a company representative named “Rick,” but when they replied, the contact wasn’t under Rick’s name—it was a random woman who worked for the company. After asking a specific question that would require a detailed response, she responded hours later with just the word "yes." Confused, Tiny Baby asked again, and the woman called him back… at three o’clock in the morning. Needless to say, his girlfriend wasn’t thrilled about a random woman calling in the middle of the night.

Long story short: RUiXU’s customer support isn’t just frustrating, it’s borderline nonexistent. Even when you can get a hold of someone using their WhatsApp number, communication is slow, which is made worse when you consider the major time zone difference. Put simply, getting real answers is a pain.

This could be a deal-breaker for anyone who values good customer service, or anyone that plans on investing serious money into a full rack of RUiXU batteries. Who really wants to play phone tag with a battery company for multiple days when you just have a basic question?

Key Takeaways:

Weight: 103 lbs—barely passes the “Tiny Baby Lift Test”.
Capacity: 5.12 kWh (51.2V at 100Ah).
Battery Type: Lithium iron phosphate (LiFePO4).
Cycle Life: 6,000 cycles at 90% DoD.
Expandability: Up to 32 units (160 kWh).
Design Flaws: No display screen, no Bluetooth, no on/off breaker.
Customer Support: Garbage.

The Final Verdict: Should You Buy a Battery from “R-Bomb”?

Despite the serious customer support issues, RUiXU’s 48V server rack battery does have a lot going for it. It’s reasonably efficient, reliable, and works with a variety of inverters. The expandability up to 32 units is fantastic, and the slimmer design makes it a space-saver in bigger server rack setups.

With that said, it’s definitely not without its flaws. The lack of a display screen or Bluetooth compatibility is a major downside in today’s market, and the absence of fire arrestors raises a small safety concern.

The poor customer support is a very serious drawback, especially when compared to more established brands that offer North American-based customer service. Still, they do have distribution channels and warehouses based in the United States, Canada, Europe, and Australia, so the delivery time when you order one isn’t an issue at all. In fact, ours arrived within three days of placing an order, which is great.

At $1,199 (often with a $50 discount taking that price down a bit more), it’s reasonably priced, but you’ll need to decide whether you’re willing to deal with the support headaches. If you can live with that, this battery from “R-Bomb” might just be worth your time and money. If you’re not comfortable with that, check out our review of the EG4 LL 48V Server Rack Battery, which addresses many of the issues we had with the “R-Bomb”.

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