Victron Energy BatteryProtect 12/24-Volt 220 amp

Being able to customize the turn off (and turn back on) voltages down to the decimal (and even 0.01 increments) was critical for my power setup in my SUV camper.I have a Dakota Lithium starter battery for my car's main battery, which has about 1600 Wh of power and recharges directly from the car's alternator. I also use that starting battery to charge my Ecoflow Delta 2 (which only has 1000 Wh). Since my starter battery charges at about 60 Ah via the alternator, it made a lot of sense to trickle charge the Delta 2 from the car battery (with this smart battery protect to turn off the charging before the car battery got too low). I have the Delta 2 charge through an XT60i cable connected to the output of the BatteryProtect (so it charges at 12V 15A, a.k.a. about 180W). This also means it's all DC-to-DC, rather than trying to charge via an AC inverter (which would be DC-to-AC-to-DC).I was able to set the BatteryProtect to turn off at around 12.60V (about 40% of starter battery remaining), and have it not turn back on until it reaches about 13.30V. Different off vs on values were critical, since when the Ecoflow is charging at 180W, the voltage dips by about 0.65V.I've been on a 3-week car-camping trip and this setup has been working flawlessly!

Works excellent. Exceeded expectations. I reccomend this to anyone with a lithium battery. Just be sure to use some sort of appropriate circuit protection

It does work, and I am able to control it via the REMOTE input. However, just like Victron's 12/24V Battery protect, their 48V battery protect also has huge problems just charging the capacitors in a small unloaded inverter without thinking there's a short or over-current (when there isn't).In addition, there is significant leakage between the IN and OUT terminals when the device is turned off. So much leakage, in fact, that when the unit is turned off the voltage builds up all the way to the battery voltage and causes the inverter to try to kick-on every few seconds. I had to add a beefy 10 Kohm resistor between the output and ground to get it to stop doing that. Both the 12/24 and the 48V battery protect products have this problem.There is also no mention of whether the device has an external diode in it or not for dealing with voltage spikes from inductive loads (that would otherwise destroy the FETs).To be frank, Victron is supposed to be a high-end company. They should fix their products.

I was installing some dashcams into vehicles and wanted them to be able to operate for many hours in parking mode without draining the car's main battery. This is a common type of setup where the dashcams are connected to an auxiliary battery which is connected, in parallel, via a voltage-sensitive relay (VSR) to the car's main battery. The VSR connects the auxiliary battery when the voltage rises to a point where the main battery is charged (and the car's charging system is running) and disconnects below a certain voltage, which disconnects the auxiliary battery when the car is turned off.However, one of the cars has a lithium main battery and I was using a lithium auxiliary battery for the dashcams, so a normal VSR wouldn't work because of the different (and critical) voltages involved when using lithium batteries (i.e., instead of lead-acid batteries).This unit solved the problem very nicely by serving as a VSR that could handle more than enough current and had the wide-range and finite/accurate voltage adjustment required. It's now been working fine for many months.

works exactly as advertised