Waterproof Battery Monitor12v 24v 36v 48v 60v 72v ,Car Motorcycle Golf cart Battery Meter Digital Battery Capacity Remaining Capacity Percentage Tester with Buzzer Alarm and Temperature（Bule）

Bought this to monitor the voltage on my 24V trolling motor system real-time. I set it up according to the the directions... Mode1: P 24 (lead acid 24V), Mode2: Off (No time-out on display), Mode3: 21.6, 25.7 (0%, 100% SoC), Mode4: 22.0 (low voltage alarm), Mode5: 30 (did not change), Mode6: Off (no temperature display), Mode7: 29.3 (High voltage alarm). It works exactly as stated. Note there is a small amount of error in the voltage reading verses my $300 Innova meter, but it's pretty insignificant. A few noteworthy items: 1) This predicts battery state of charge (SoC) purely as a function of voltage. It uses a linear scale with the voltages setup in mode3. 0% at the low voltage and 100% at the high voltage. Unfortunately lead acid battery SoC curves aren't really linear vs voltage, but it gives you an idea of where you are at. Also as the voltage fluctuates with device loads, the SoC reading will fluctuate right along with it. For me it's not a problem, I only really pay any attention to the SoC% (and the Voltage readings for that matter) after a settling period with the trolling motor not being used. 2) The device uses power even when the display is off. With the display on and the light on, the unit consumes ~9mA, with the display & light off it consumes ~1mA. This might not be a problem depending on your application, but I store this boat over the winter and don't want any additional parasitic loads or to have to disconnect the batteries every time, so I installed a water proof switch inline with this device to truly shut it down when my boat is not in use. 3) The display is quite small. I've not used it on the boat yet, so I can't comment on how easy it is to read mounted 6 ft away (near my feet) in bright sun light. I'll update this later. Update: Installed on the boat and can easily be read from 5-6ft away in most lighting conditions. Note that the glare of the full sun can make any display hard to read. 4) The alarm can be silenced by pressing the mode button for less than 1 second. 5) The temperature display is only available in Degrees C. I live in the US and prefer Degrees F. I shut off this temperature display, because with my 24V system and the temperatures I mainly use the boat (20-30C) combined with the small display size, I'm concerned it could easily be confused with the Voltage reading. How water proof is it? Time will tell! It will get a full test mounted near the bow of my boat. I'll update this review if the unit fails due to water intrusion. I like the fact that it can be set up for different types of batteries. I plan to upgrade my boat in the future to LiFeP04 batteries and will only have to make a small configuration change to this unit.

At first I had trouble setting up this battery monitor because I couldn't find the number of strings for my LiFeP04 batteries. Without this information it will give you the voltage reading but will just always show 100% charge. I finally found the correct number of strings for my batteries, and this meter works fine. It is very bright, even on a sunny day. It seems very accurate. The instructions are complete, and needs to be followed one step at a time.

Has worked great so far, nice and simple

Product was packaged and delivered as usual, it was easy to install and works as advertised, the on con would be that it's led display could be brighter for daytime use.

Installed this on a stand up ride on vacuum. Though it is an expensive machine it doesn't have a battery gauge. It just runs with a green light until the vacuum motor shuts off from the voltage dropping too low, then the green light blinks green. I hated it shutting off in the middle of a large carpeted area. So this was the perfect solution. All I did was set the battery type a lead acid (they are really AGM but it reads the same). Then I set the highest voltage under a load 100% and the lowest voltage when the vacuum motor shuts off as 0%. Accurately tells me the remaining capacity. It takes some fine tuning to get the voltage right for it to accurately tell you the battery %, but it's worth it. The vacuum is 36v and this little guy let me know when the old lead acid batteries were over charging.

Works but you can’t program for 36 volt

Does not work. WAY OFF goes from 37 percent to 77 percent in a matter of seconds. But for the cost I'm not sending it back. Buyer beware

Works exactly as advertised. Very easy to install!