48V 100AH Lithium LiFePO4 Battery, Built-in 100A BMS, with Touchable Smart Display & Mobile APP, Max. 4800W Power Output, 5000+ Cycles, Perfect for Solar System &Off-Grid Applications

This review is for "48V 100AH Lithium LiFePO4 Battery, Built-in 100A BMS, with Touchable Smart Display & Mobile APP, Max. 4800W Power Output, 5000+ Cycles, Perfect for Solar System &Off-Grid Applications", Vatrer Item model number 51.2V 100Ah (ASIN B0C9HPYKNG). Title and ASIN are included in the review because sometimes reviews get re-sorted and are no longer associated with the correct product.The Vatrer 51.2v 100Ah LiFePO4 battery shipped quickly and was packaged particularly well a double-walled cardboard box via UPS Ground. Within the double-walled shipping box was a second double-walled cardboard box which held the battery. The was battery was boxed in an inner double-walled box, and within this box the battery was covered in a plastic bag and cradled in 2in foam on all six sides. Very impressive, and probably sufficient to escape damage even with a shipper's rough handling. Along with the battery came a sheet of stickers and box containing a manual, rack mount wings, and two battery cables.I plan to use the Vatrer 51.2v 100Ah LiFePO4 battery with a 2200VA 48v UPS unit which should draw a maximum of about 65A under a worst-case scenario, so the battery's 100A BMS should have no trouble. Furthermore, I rarely load this UPS unit above 50%.SUMMARYTesting shows that the Vatrer 51.2v 100Ah LiFePO4 battery delivers over 100Ah of capacity.The Long NarrativeBefore using any rechargeable battery, I perform a series of capacity tests using my computerized battery analyzer (CBA). I like to confirm that a battery has the advertised capacity as claimed. Vatrer claims the battery to be 51.2v and 100Ah. In addition to the 100Ah claim Vatrer claims that the battery is 5120wh which is consistent with the voltage and amp-hour claim (51.2v)(100Ah) = 5120Wh. I typically test batteries by fulling cycling them until two consecutive capacity tests indicate the same result to within 3%. I choose a discharge rate of 1C (or a max rate which does not exceed my tester's limit of 100W) and I configure the test to stop on LiFePO4 batteries when the cells have been discharged down to 2.5v (i.e., 40v for a 16-cell battery pack). I have performed capacity tests on literally thousands of batteries (NiCD, NiMH, Li-Ion, LiFePO4, SLA) and my expectation is that a new LiFePO4 battery should be able to deliver 95%-98% of its rated capacity. For this battery that would be 95Ah-98Ah or 4864Wh-5018Wh.Why do I perform this sort of testing? It has been widely reported that sellers exaggerate the capacity of the batteries that they sell. I've personally encountered these many times. For an example, see an 18v Li-Ion battery which was marketed here on Amazon as compatible with Ryobi 18v tools (see https://www.amazon.com/dp/B08TR82J1D). The compatible 18v battery claimed to be 3,000mAh capacity, but extensive testing revealed that the battery actually delivered less than half of that and the battery had other problems as well.Unfortunately, my computerized battery analyzer (or "CBA", a device designed to accurately measure the capacity of a battery pack) is rated for a maximum load of 100W and a max voltage of 55v. The Vatrer battery will be at 58.4v when fully charged, and this means that the maximum discharge rate I can configure the CBA for would be (100W)/(58.4v) = 1.7A. For a battery rated 100Ah, that's a rate of 0.017C. I strive to complete a discharge test on smaller batteries in about one hour, but for such a large battery this test would take about 59 hours -- longer than two days! For testing, I connected a 1500VA online UPS through my datalogger's shunt. I also connected an AC power meter to the output (https://www.amazon.com/dp/B07JB9B2QL).When I first powered on the Vatrer battery it indicated that it was charged to 55%, so I began by charging the Vatrer battery with a 10A LiFePO4 charger. Charging to 100% took about 4.5 hours. I then disconnected the charger and connected the Vatrer to my 1500VA Online UPS (powered down, AC input not connected, no load). I plugged the UPS into an AC outlet and with no load plugged the UPS into a utility outlet. I powered on the UPS and waited for it to go through it's power on checks and indicate that it was online. I then plugged a ceramic space heater into the UPS, set it to LOW, turned it on and waited for the power meter to stabilize, which took several minutes and the power draw settled in at around 620W.I reset the counts on the datalogger (DC input) and AC energy meter (AC output), then unplugged the UPS from utility power. The meter on the face of the Vatrer indicated that at this rate the battery would be depleted in 7.5 hours. Boy I like being able to see at a glance how much run time remains! I walked away, but popped by several times to observe. At about 6 hours in I observed 51.26v and 13.9A (713W) from the battery as per my datalogger, 51.33v and 13.8A (708W) as per the Vatrer panel, and 120v/5.144A/615W on the AC meter. Therefore, the UPS is about (615W)/(713W) = 86% efficient. I further observed on the Vatrer panel that the cell voltages ranged from 3205mV to 3212mV, indicating well balanced cells in a tight range of only 7mV! The battery eventually gave out and I was not present when that happened.I reviewed the data and created a graph of the discharge curve. I uploaded graphs showing the entire discharge, the first two minutes, and the final five minutes. The full curve shows that the current draw was 13.5A-14A for most of the time, and that the Vatrer battery maintained 51v-52v during that time. The beginning of the curve shows that the voltage and current took about two minutes to settle in around 53v and 13.5A. The end of the curve shows that UPS disconnected the load when the low voltage threshold was reached at 7:23:54 (41.27v and 17.1A). The Amps drawn immediately dropped to 0.3A, though that also happens to be the lower limit for the datalogger so it may actually have been a bit less. At this point the UPS is supposed to draw just enough current to keep powering the display panel and the internal cooling fans for an additional four minutes. During these four minutes we see the Vatrer battery's voltage start to recover thanks to the significantly decreased load. The UPS then shuts down at 7:27:54. The capacity of the Vatrer is measured at 101.7493Ah. This exceeds the 100Ah rating. Nice!I plugged the UPS back in and it started charging the Vatrer at it's fixed rate of 800mAh. At this rate it'll take 125 hours to fully recharge the battery! I forgot to record the status of the cell balance, but I do remember checking it and being impressed with the small span. I connected my 10A LiFePO4 charger and walked away. The Vatrer has two sets of terminal posts, so it was easy to connect the 10A charger without having to disconnect the UPS first. I returned after about 7 hours (shortly before retiring for the evening) and the Vatrer indicated that it was charged to 78% and the cell voltages were in a range of 3377mV to 3382mV, a span of 5mV. I disconnected the charger because I knew that if the battery is charged beyond about 55v the UPS will start beeping and indicate an overvoltage fault which cannot be cleared without power cycling the UPS. The next morning I used the 10A charger for another 90 minutes then allowed the UPS to top off the Vatrer. At some time later the UPS discontinued charging the battery. I'm not sure when this happened, I left it and came back the next day. On the following day the Bluetooth app indicated 100.8Ah/100.0Ah, 54.8v, current 0.0A, power 0.0W, a maximum voltage difference in the cells of 0.009V, an average cell voltage of 3.427v. and number of cycles 2.I screwed the rackmount wings onto the Vatrer and then mounted it in my 19in rack where I have two 2200VA Online UPS units. The battery is tall and requires a 4U space. The two UPS units in the rack are each currently powered 48v 50Ah LiFePO4 batteries which I purchased at the same time six months ago. I connected the Vatrer to UPS #1, and I reconfigured the two 50Ah batteries into a parallel configuration then connected them to UPS #2. We were expecting 4-8 inches of snow later that week so I was confident that we'd lose power at some point, yet we never did.A couple of trouble-free weeks passed, and I used the Bluetooth app regularly to check the status of the battery. I downloaded Overkill Solar's app, which readily connected to the Vatrer. The Overkill app provides far more information about the Vatrer battery, including BMS manufacturer (ZJDY), firmware version, device name and manufacture date, plus access to numerous configurable BMS parameters.The Vatrer 48v 100Ah rack mount battery is really a nice battery! Testing shows that its capacity exceeds its rating, the rackmount design is what I was looking for, dual terminal posts make it easy to parallel multiple batteries or connect an extra device (such as an external charger) and the display gives all much of the information I'd like to see at a glance, as does the Bluetooth app. Third party apps provide the ability to access and change BMS settings.

This battery is a great option for a solar system. This unit is not UL listed, as of now, but this works great for off grid systems. The unit shipped quickly, was well packed and arrived safe and sound.The built in display makes it easy to see the condition of the overall battery system as well as individual cell voltages. True, this doesn't have built in communications but for the intended use, you probably don't really need it.Vatrer does offer a wall mount system with communication if you really want/need that.

None of the batteries in this review are the batteries that are in this listing although I have purchased this battery that is listed and it does communicate with EG4 6000 XP. Inverter. Even though there's no user manual. I have not found a manual. Happy with it so far.

This thing is awesome for my application, off grid cabin and for extra battery storage for my power station. Came in well packaged(no damage), The app sync'd right up and it has all the info I could ever need....I hope to add another.

Contrary to a negative review on here this battery seems to have the full set of 16 cells based on the full charge voltage. The touch screen is not fully touch, just the bottom area, but that's ok. What surprised me is the range of the Bluetooth transmitter, at least 75ft through a couple walls. The app is about average but informative. All in all a great value for what you get. I've used it a couple times under full charge and discharge cycles and it shows typical charge and discharge curves, similar to my eg4 batteries. Very pleased for something $400 cheaper.Update as of 3/7/25Still going, powering my off grid RV on my secondary property. It's tied into a 5kw solar array through an eg8k hybrid inverter. Been running unattended since September. I wish it had wifi or some sort of canbus communication to monitor it directly, but I do get some feedback through the inverter. Be nice if they added that at some point. All in all still pleased, enough that I bought a second unit now that it's on sale to take with me when I go up there.

Was shipped fast, delivered very carefully by the UPS carrier. The unit arrived with no signs of mishandling, the installation is quite basic but the weight is something to take into consideration. So far seems to work fine and the app works well although the Bluetooth does not have a good range and that may become an annoyance in some environments. It feels solid and well made. Based on my experience I would recommend this product.

Nice BMS controlled battery bank. 16 cells for 57.6 nominal voltage. Works well with my Outback VFX 3600.With the lifespan of LiFePo4 batteries, this should last well over 10 years of service, even with occasional power outages. This 1 bank gives me over 5 KWh of backup to my most critical loads through a subpanel.When I first installed the system, I used lead acid, 6 volt Trojan batteries. Eight in a string for 48 VDC nominal. But lead acid chemistry requires constant maintenance. Monthly or at least every several months is an equalization cycle, followed by adding water. Time and energy intensive.I tested LiFePo4 chemistry batteries in a small scale system for about 8 years before learning the true value of the chemistry.I am pleased with this purchase, and might order another bank for additional capacity in the future.

The only “negative” is the phone app communication is Bluetooth only, no wifi. Otherwise for the price these are amazing. Had them for pushing a year so far myself and everything’s still premium