AiLi Battery Monitor Voltmeter Ammeter Voltage Current Meter 8-80V 0-100A Auto Car Motor Boat Caravan RV Motorhome

Worked perfectly right out of the box. Nice heavy duty acrylic base and super heavy hardware. Simple operation is refreshing in this overly gimmicky app-inundated world we live in. Some other manufacturers could take notes from this monitor!Others have said there is no way to secure it into your cutout if you can’t access the back. I can confirm that. However , a 2 1/8” hole saw produces a perfect fit in plywood. I didn’t need it but one could add a single layer of electrical tape around the perimeter for a super snug fit.Yes, cord is too short. Ended up being just enough for my application. You can extend it without too much trouble. It’s a standard 5 pin JST-XH.Battery sampling wire I used was 18awg. The screw terminals on top of the unit worked great. Philips, very small. Consider tinning the end of your wire and then smashing it flat and trimming it square for a good connection. 18 gauge is probably about as big as it will accept.Even the backlight is great. When the backlight is turned off the screen still glows ever so slightly so you can read it. Perfect for nighttime in the woods. The screen is quite shiny so consider glare from windows when installing.The accuracy of any monitor depends on your configuration! For my one year old AGMs I used 50% of the rated capacity and charged them up fully with a good 3 stage charger before connecting this monitor. Then set the current SOC to 100 and forgot about it. I set zero % SOC voltage to 10.1. Have a couple weeks camping in the RV so far with good results.

Got this monitor for my Chevy Roadtrek RV based on its simplicity and price. I wasn't disappointed a bit. Simple installation (except that you will need a cable to go from the shunt to the positive post of the battery--something I had to fabricate for myself) and the monitor pops into a 2 1/8" hole. Works from the get-go. Calibrate it, and from then on you can read off the percentage of charge in the battery, both when charging and discharging.Things to be aware of:1. You will need to make up your own cable from one side of the shunt to the + side of the battery.2. The connecting cable they give you from the shunt to the monitor is much too short. I had to slice in a 5-conductor cable of my own making.3. The instructions say the hole size of 50.4 mm (or something like that). Try to find hole saw that size. Turns out a 2 1/8" hole saw will make a perfect size hole.4. The instructions are in ity-bity font size, and the graphics of the buttons are pitifully small and impossible to read. I had to take a picture, enlarge it and put my own icons on the result to be able to figure out what to do.5. The button labels are hard to read. Too small and the graphics have almost no contrast.Now, if you are ok with all that, you will have a fine little battery monitor that tells you pretty much all you need to know about the state of your battery. I like mine and didn't mind that it turned out to be a project to install it.

Great product for the money.The written instructions are not very clear, in my opinion. Best to watch YouTube video for better instruction to set up and operate.So far, very happy with this monitor.

I actually rate this 4 1/2 Stars.I chose this meter mostly on the reviews and display interface and because it was a shunt vs hall effect type. The install was fairly simple and so is the set-up, especially if you can read Chin-glish. There are several videos on youtube also. You must remember that this, and other meters, rely on what parameters you enter. If you tell it you have a 100ah battery and it's charged at 100%, it assumes that is correct. If your battery is older and has been through many cycles, it's no longer a 100ah battery. My three year old flooded deep cycle 105ah battery now has a ah capacity of 75ah. If i enter 105ah and 100% charge, when it tells me I've used 52.5ah and am at 50% with 52.5 ah remaining, it's not correct. Yes I've used the 52.5ah but 52.5 from 75 is 22.5ah remaining with 30% left, putting my battery in the danger zone of more than 50% discharge. If I decide to say let it run down to 30% and I'll charge it tomorrow, I'll end up close to dead! So it's up to you to be sure what you really have. If you're not sure, they tell you to discharge the battery completely, set display at 0 then charge it fully to see how much current it will accept. Then use that number to set up your meter.The meter reads both directions, charge (display light blinks and shows up arrow) and discharge (display light stays on with a down arrow) and at rest, the light will go out until one of the buttons is pushed. It will give you the total amps going in or out, ah's left, a percentage of ah left and a percentage picture "guage". There's no way to turn the display off so if the blinking or on light is bothersome, consider this when selecting a location for it.It reads in amps, NOT Watts, so you end up multiplying amps by volts to get watt usage. It's my biggest complaint with this meter. I minus 1/2 star because of this for a 4 1/2 star rating.The supplied cable is about 6 ft. long. Amazon sells a 16 ft. cable from Aili.It's listing is "Custom cable for battery monitor 26awg with connector stranded shielded cable - 16feet"Pictures show it as an extension cable but reviewers say it's a replacement cable. It also lists different ASIN numbers for the 100a shunt cable and 350a shunt cable but no choices to select from????