Koolertron 400A Battery Monitor with Shunt, 0-120V 2.4inch Display Wireless Voltage Current Meter for Boat RV Motorhome Car Motor Golf Cart Solar System, Blue,Green

I purchased this battery shunt monitor for my small solar setup. We power our bedroom TV from a 12v battery which we charge via a 200w solar panel. I had a small battery monitor which worked out the SOC from voltage alone, however this was proving very inaccurate. I did not want to over discharge the battery and cause damage to it i decided to invest in a shunt based monitor.One of the key features i looked for was that i wanted to be able to connect the monitor to my phone via Bluetooth. I did my research and decided on the Victron battery shunt, that is until a social media platform video reviewer reviewed this device and rated it value for money wise over the Victron. I placed my order on the basis of that video review!Installation was a little challenging as i have never installed a battery shunt before, the instructions were not clear enough for me, so i again turned to a social media video review - this made the wiring of the device much easier and simpler to understand. Within about 30 mins i had the device all wired in and set up. You will need an additional negative terminal wire to make this device work - i made one up with some spare cable and battery lugs. I then used the free app to programme my battery AH, however the app was showing the battery at 23% despite it being fully charged. After much messing around i realised that if you click on the battery you can set the current SOC - doing this i now had a battery that was showing 100%. Plugging in my inverter i was able to see the current draw in watts and amps, turning on the TV resulted in these figures increasing, perhaps a little more than i thought. I was expecting to see a draw of around 70w however this was hovering around 98w, perhaps my inverter isn't as efficient as i thought it was!Overall i really like this device, the display is functional and provides all the information you need and more! The app is great and will be my primary source of monitoring the battery. The app also has a ton of other features, many i do not yet fully understand - but the design is simple and easy to understand.At this time i am very happy with the monitor and would recommend it to others.

Got this as I wasn't happy with my solar charge controllers wireless options / software. This is an amazing device that allows you to remote / monitor charging, current / power usage, battery voltage, temperature and more. The app's layout is good and easy to understand. The display which you can switch on and off is also very good. There is a history function but that could be improved somewhat. Straight forward to install.

Koolertron 400A Battery Monitor with Shunt, 0-120V 2.4inch Display Wireless Voltage CurrentBeen running continuously for the last couple of months. Works as expected can't fault it wouldn't hesitate to buy another.

Fitted to a campervan mid Oct '24, only switched on about 10 times to check charging status on occasional uses of the van. When it had been fitted about 3 months I inadvertantly left it switched on permanently for about 3 days which shouldn't cause an issue, but it failed. I've only just had time to investigate the cause as the unit is installed with an underslung battery which is very hard to get to and requires a commercial ramp. I now want to progress a replacement but Amazon refer me to the manufacturer and quite honestly I have no idea who that is. So I'm not impressed. I would like to think that if I had purchased from a reputable company I would have at least a 12 month warranty.

Installed on my campervan and it iss better than I thought! Great product App was a bit dificult to download.

Performs as expected, for a fraction of the cost of the "shunts" provided by the well known manufacturers.

I have fitted this to my power wheelchair as I replaced the gel batteries with lithium batteries which caused the power level meter to always show full.With this I now can see exactly how much power is left and what amount of power it is using and provides lots of information.I had to watch a YouTube video for help how to fit and set it up correctly which was quite straight forward.A very good price for what it is and furthermore you can connect this via Bluetooth to a phone app and see all the information on your phone.

Simple to install. And a boon for a geek like me to monitor a camper ban battery and solar input. Not the cheapest. But evidently one of best. Oh, and the phone app is funky, too.