PowMr Battery Equalizer 48V - Battery Voltage Balancer,for 4×12V or 8×12V or More Battery Bank Extend Battery Life 1 Year and More, Support Gel Flood AGM Lithium Battery HA02 Balancer

These things definitely do their job on a solar battery bank when using lead acid batteries. Durable in the elements too. No problem with failure or leaking for over a year of being used outdoors.

Has been keeping my batteries up to 14.5 volts.

Works great. Batteries were with .01 volt after balancing and stayed there.

It does have a pitch as someone mentioned which is how I figured out initially the one failed so there’s no lights or anything which only would draw additional power so My little Whataburger suck at murder is about the best way you can make sure everything’s consistently working you can pretty much just walk into the room see the batteries are doing. Everybody complains about China but here we are electing Biden opening up the borders to illegals And have had shootings every day since month after he took office!I’ll update the update the company doesn’t respond as never responded but after swapping defective one haven’t had any issues with my 2 units. I just added another 48v bank so buying a 3rd one. Lol the Wires getting annoying but working on better layout design I hope for designated room.It might be over kill but I use 1 per 4x batteries since only good for 10amps and I’m fully off grid on flooded lead acid so I just want everything optimized. I’m using heavy duty commercial 8DFT from ORiley’s so not a deep cycle but they still test good after 1 year. I rarely bite more then 30%DOD which is becoming easier to manage with each additional bank. I’m probably going to start buying the group 31 Deep cycle and have a hybrid combination of heavy duty start and deep cycle. Weight and transportation is really main issue lol otherwise I’d be buying Rolls lol.UPDATE - SO COMPANY DOESN'T ANSWER EMAILS OR RESPOND & CHINA PHONE NUMBER -So I received my replacement and can explain do you y’all how to test using a voltmeter either with homes or the alarm setting.If your ohmmeter has the alarm function put in that and if you touch the negative and positive and the alarm goes off it’s a close circuit in the device is bad I waited till I got my replacement to test my one that went bad and the one that works along with the replacement. If you get any kind of homes that are even a crossed off 4 I’m setting it’s bad there should not Be a constant resistance or an alarm.be a constant resistance or an alarm.Tossup on what you get these are made in China I went to the website all silly typos in English. Can’t get technical support. I’ve had one for two months and one that I just got on the last two weeks they seem to do their job but they run hot to touch seems like they are under sized on wire

Excellent unit. very tight. Solid build.

The good: I wired this up to four 12V/200Ah LiFePO4 batteries in series, one of which was noticeably lower in capacity than the rest, and it took about a day to bring them all within 10mV of each other.The so-so: I can't really say that equalizing all the batteries at the top helped much with extending the usable capacity, but it did, at least, stop that low-capacity battery from hitting 17V+ while the other three were still at 13.6V or so. This equalier does - er, did - make a faint high pitched whining sound in operation but I didn't find it to be loud enough to be objectionable; YMMV.The bad: It caught on fire, obviously, but the actual cause is a mystery since the battery was balanced and around 60% SoC. There are two MPPT solar charge controllers set to 56.2V max that can supply up to 30A or so total (only 4 x 225W panels for each of them) and an outboard 54.6V / 15A charger as well, but it wasn't running at the time of failure, so it doesn't seem like it was a case of excessive current.Note that this same equalizer is marketed under various brand names but all look very similar - I wouldn't trust any of them at this point, but if you can't resist the siren song of a cheap price, I strongly recommend splicing a 15A fuse inline with each positive wire.

I have a 48 volt off grid solar setup that I first installed 11 years ago. Without going into the particulars, every thing I have learned about solar; panels, controllers, inverters, wiring and connectors has been by trial and error. I am self taught in AC and DC voltage. As such I know what size wiring and the most efficient way to run wiring and connect circuits. That said, I started out with 6V golf cart batteries wired in series. I have maintained all batteries and have averaged about 5 years of usable life. I bought 4 LifePo batteries last year which I put in place of my 24 golf cart batteries. I then took 12 of the golf cart batteries and set up another system. The 12 batteries range in age from 4 years to 7 years. I read about battery balancers and bought one for the LifePo batteries. The voltage was within specs but one would usually be higher or lower, usually not the same battery. After I installed the battery balancer, it took about 10 days and then, I was happy to find every battery in the string was exactly the same. I figured I might as well try one on my old golf cart batteries. To my amazement, it took about three weeks but the voltage is very close on each 12V string. For 6V golf cart batteries, I consider that outstanding. Just wanted to share my experience with this product. God bless you all.