Victron Energy Battery Balancer

I’m using these to balance my lithium batteries, and so far they’re doing their job really well. Very satisfied with the performance and reliability.

High quality item! I absolutely love it. Definitely recommend!!

El producto es justo lo que esperaba, muy buena calidad y cumple perfectamente su función pues las baterías cargan al Mismo tiempo y din riesgo alguno. Nos sentimos muy confiados con este producto

Súper bueno , lo instalaron con las baterías y hasta ahora ha funcionado perfectamente

It's bn about a week, here's what I found. If using on lipo battery the bms will make it chatter,between batteries once fully charged. Between A&B hi volt inputs

Estoy muy satisfecho con este producto lo compré para mandacelo a mi mamá para instalarlo en un sistema de paneles solares y resultó de muy buena calidad lo recomiendo, es muy bueno

As I am a fan of Victron, this is one of the items I will give a negative review for. Per the manual as well as the advertisement in the product page, this item can be used in a 48v series configuration of 4x12v batteries. It states you have to purchase 3 in order to do it and provides instructions on how to configure it. I was hesitant because 3 of them makes it about 2x as expensive as buying any of the other units on amazon that will balance all 4 batteries at once. The reason for the 1 star is because the manual does not state how battery balancing works in a 4S series. In a 2S it would work just fine. This balancer only ever balances 2 batteries. It compare each one its connected to and balances them out. Forget the incredibly high voltage required for these to even turn on. Other reviewers have already posted the negatives on that. In a 4S, you need 3 units because the first balances battery 1 and 2, the second one balances battery 2 and 3, and the third one balances battery 3 and 4. The manual would have you believe that the balancers may communicate with each other somehow, but they dont. So battery 1 and battery 3 and 4, Battey, 4 and battery 1 and 2, etc, they dont know about each others voltage. In theory this would work, but im my case, almost always this will balance 2 batteries somewhere, but the ones farthest away end up over .2v off from each other. For example, Batt 1 - 13.50v, Batt 2 - 13.58v, Batt 3 - 13.66v, Batt 4 - 13.74v. If you look, no 2 batteries directly next to each other are off by .1v or more, so balancing will never happen. Batt 1 and Batt 4 are .24v apart. I have noticed that sometimes, the voltages are so off from the left to the right side, that the voltages on the low pair dont always reach a high enough voltage to even turn on in the first place. Sometimes because of the differences, the Internal BMS of the batteries kick on and shut down before the balancers even start working. For a 2S I would recommend these. In a 4S, these are a money pit.

I needed to balance a 4 in series 12.3V LiFePO4 Batteries with built-in BMS. Since the batteries were not being charged/drained equaly for some reason, the BMS in one of them would kick in prematurely and bring down the whole thing. (Was looking at the charger and inverter until I figured this out). So I've been trying battery balancers. Victron Solultion was the most expensive with the need for 3 for 48V system! Lessons Learned (Let's start with CONS) * These devices ONLY KICK IN AT 27.3V Total voltage for 2 batteries. My BMS was kicking out at 13.3V so 2 would never reach 27.3V I had to force my charger to go beyond recommended to have these kick in and balance. I wish we could have a way to choose a lower point to start. * The Victron devices don't come with any cables. You have to buy/make them. I built my but it was time consuming and hard to install. * Adding an extra set of connector lugs to batteries is not always feasible as the battery screws might be too short, so you can't have too many things plus washer and clip. My system being 2P4S , I have a lot of cables and connectors for the MPPT charger and Inverter, so I needed to get longer screws and bigger washers. Should be easier. The end result was a messy spaghetti of cables all over the place - Started so nice and organised * They have a large heatsink in the back and they get used and hot. I'm worried about mounting them on a wooden panel I have my cable connectors on. Pros - as of now * Once I forced the charger to try to go beyng what was stable before, these kicked in and started balancing between 2 sets. * The Victron devices come with LED status light which is waaaay better than the much cheaper version that can handle 4 connectors (built-in) but give you no indication. Will keep them and supervise until the return window gets closer. I need another set for a much bigger project and want to make sure these keep on working. Ugh , 3 more to buy.