Electronics-Salon Low Voltage Disconnect Module LVD, 12V 30A, Protect/Prolong Battery Life.

I bought this as a safety cut-out for a solar setup I made. Since the cheap solar controllers that come with many solar panels can only handle 10A, I needed something that was beefier (ran two box fans for Burning Man that would draw 19A total), and this was a perfect fit. I wanted to have something that would cut power to my DC inverter if my battery level went below 11.7V (the cut-out is adjustable, but after doing some research, it seems that you do not want to go lower than 11.4-11.7V on a lead-acid battery since damage will occur). I paired this with a digital voltage meter, mounted them both in a project box, and ended with with a very solid PCM. Once the solar panel charged the battery up to 12V (again, the cut-in voltage is adjustable too), this PCM would turn my inverter back on. I will 100% buy this product again for other solar projects that may come my way.

When the relay is turned on, it draws 0.09 amps of current with no load (as measured with a multimeter). When it is turned off, the current draw is below the resolution of my multimeter (i.e. less than 0.01 amps), but be aware that there is a red LED light indicator that draws a tiny amount of power, which can drain your battery if you let it sit for many months.I used this to keep a cooler in my car running for a few hours after I turn off the ignition. And it works perfectly for that. I set the cutoff to 12.1V, and it seems to actually cutoff closer to around 12.4V to 12.5V. Or at least that's the battery voltage I read after leaving the cooler running in the evening and returning the next morning with a multimeter. It's not a bad thing per se, depending on your application. For me, it means my battery will last more cycles. And the cooler runs for about 2 to 3 hours before being cut off, which is about the amount of time I was looking for anyways.My only complaint is that when I leave my car, the power locks will sometimes drop the battery voltage low enough to cut off the power supply to my cooler, so I will have to restart & stop the engine and then lock my doors manually with the key. If you're more electronics-savvy than I am, you can probably fix this issue with some sort of capacitor across the input wires.

worked for three days. shut power down at 11.4v as set. once recharged it never turned back on. i got it back on manually. then it never cut off at 11.4v. drew my batteries down to dog piss jones. DONT TRUST!!! BATTERY KILLER

Very nice equipment. Suits my needs to run a small power inverter that is run from a solar charged battery. Excellent equipment. These are inexpensive and same day amazon prime shipping. These smaller 10 and 30 amp models shut off IMMEDIATELY when they reach their cutoff voltages. This works but is not ideal in all situations. It looks like the larger 50 and 80 amp versions have a circuit in them that requires the cutoff/cutin voltage is reached for at least 10 seconds before triggering the relay...For example. Your cutoff voltage is 11.4v and your battery is at 12.1v - You start a load on your inverter that has a high startup current and that will make the voltage drop momentarily to a low voltage, maybe 10 or 11 volts and then jump right back to ~12.1v With these inexpensive models, this would trigger the disconnect. The more expensive/bigger units such as part number D-1116A would require the voltage to drop for more than 10 seconds.I hope that makes sense, and is helpful!

Rated for 30A, but when putting a continuous 16A through it, the entire board got hot. Seems to work correctly but I don't really trust it. Thermal photo of underside taken using seek camera, product was only running for about 5 minutes!

This review is for version 2.0.I can't really recommend this for use in a vehicle.First of all, the text in one of the images states that this will not turn the power off/on until there has been 5 seconds of continuous voltage reading beyond the set threshold. This is false! It may be true for other models but not this one!This was a big selling point for me and I am very disappointed to find that the switch happens immediately so any minor fluctuation in voltage (power locks for example) will trigger the device to shut everything down making this LVD useless for me.You can not set the shutoff and restart voltage to be the same. e.g. Setting them both to 12.1V simply causes power to remain off.For a car battery, any of the available voltage setting below 12.1 would be damaging to the battery. So the only settings you can actually use with a car battery are 12.1 off & 12.8 on. That may or may not be fine depending on your application.Other than that, this LVD does work well. Setup is easy and any documentation you would need is printed directly on the board. Just know what you're getting before you order. Personally I see the 5 second thing as false advertising.

Saves lead-acid batteries from being killed by over use.Very well designed PCB, easy to use wire connectors so you can use this on any sort of device. I connected PowerPoles to mine to put it inline with my battery terminals.As the picture shows, printing on the board is very clear and easy to use. No danger of connecting it wrong or using the wrong settings.

I used this in my sailboat battery power supply circuit, and it worked well. There is about a 20ma drain supplying the board, which is 1/2 AH per day, which might be an issue. Cheap protection for valuable batteries, and it also keeps delivery voltage above a set limit, protecting the supplied circuits. Great protection for the price.