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HENGSHAN

AILI TR16 Shunt Battery Monitor, 8-120V up to 500A Voltage Current Meter, State of Charge Display up to 999AH, Compatible with LiFePO4 Lithium AGM Gel – for RV Camper Caravan Boat Solar Off-Grid

Based on 1,460 reviews
Condition: New
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$37.79
Holiday Deal · 5% off was $39.90

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Arrives Sunday, Nov 15
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At a glance

Condition
New
Size
8-120V,0-500A
Model
TR16-500A
Weight
400 g
Material
Polycarbonate (PC)
Voltage
120 volts
Part Number
AL-16-80V-350A
In the box
Meter2M CableShuntShunt bracketManual

Features 5

  • SHUNT BATTERY MONITOR Read State of Charge (%), voltage (V), charge/discharge current (A) & remaining capacity (up to 999Ah) in real time like a fuel gauge for your battery bank. Includes 350A / 500A precision shunt for accurate coulomb counting.
  • UNIVERSAL COMPATIBILITY 8V120V, supports 12V / 24V / 36V / 48V systems. Works with LiFePO4, Lithium-Ion, AGM, Gel & Lead-Acid batteries. Perfect for RV, camper van, marine boat, solar off-grid, golf cart, motorhome & home battery backup systems.
  • BACKLIT LCD DISPLAY & EASY DIY INSTALL Large, clear screen readable in any light. Ultra-low standby draw (5060A) protects your battery. Memory retains data after power-off. Most users install in under 20 minutes no electrician needed.
  • COMPLETE KIT INCLUDED Package contains display meter, 2M extension cable, 350A/500A current shunt & user manual. Self-powered (880V), no isolated power supply needed. Programmable capacity (0.1999Ah) fits any battery bank size.

Description

Founded in 2017 by Dr. Kevin Li, HENGSHAN reimagines solar power—making clean energy accessible. We offer industry-leading panels, high-performance kits, smart batteries, and IoT solutions for RVs, off-grid, outdoor, and home backup. Rugged, easy to install, and built for any environment, our products blend innovation, durability, and affordability to empower energy independence. HengShan: Innovating solar for a smarter, sustainable tomorrow. HENGSHAN was founded in 2017 by Dr. Kevin Li with a clear mission: to make clean, reliable solar power accessible to everyone, for everyday life and adventures alike. We combine advanced R&D, user‑centric design, and smart IoT integration to create highly efficient, rugged, and easy‑to‑install solar solutions. We stand out by balancing top performance, durability, and affordability for real‑world use. We love empowering global users to achieve energy independence and a smarter, more sustainable future. Real-Time battery voltage display, supports 8-120V. Rated current: 350 A,Peak current: 500 A. Supports 0-999 Ampere-Hours (Ah). Real-Time remaining battery percentage display.

Specs 12

Brand HENGSHAN
Material Polycarbonate (PC)
Item Weight 400 g
Number of Items 1
Unit Count 1 Count
Brand Name HENGSHAN
Voltage 120 volts
Part Number AL-16-80V-350A

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Nov 15

Yes, absolutely! This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

Great addition to the RV. Cost effective and accurate Battery gauge.
Size: 8-120V,0-500A
Review Image by Martin Politick
Review Image by Martin Politick
Review Image by Martin Politick
Review Image by Martin Politick
Review Image by Martin Politick
Review Image by Martin Politick
I love this gauge so far. I've only been using it for 3 months. It's very sensitive, it will show that I'm drawing from the battery even if I have a single LED light open in the RV. It seems accurate so far, but I don't have an other measuring tool to compare it to... I've purchased the 350A model and I was able to configure it for my 200 Ah batteries, despite what others are saying (maybe I have a newer firmware). The difficulty come from the installation. The flange on the display is TINY, see the 3rd picture. That means that you need to use a hole saw that is of the exact diameter and that you need to be very careful not to damage the cabinet wood as the flange will not cover any mistakes. Also the wire that comes with the kit is very short. I've had to extend mine, I've used Category 5 network cable and it did a good job. When I was stapling the wires in place I'be shorted the white and the yellow... the wires became really hot but it looks like it did not damage the unit. The mounting gear is pretty fragile but IT DOES the job, when I looked at the cheap plastic nut I thought I'd have to come up with something better, but it really holds in place and the display is very light. I've installed it near the door so I can see it when we're closing the RV and making sure everything is turned off. To attach the shunt to the battery, I've used a few inches of a 1/2" copper pipe that I've flattened with a hammer and drilled 2 holes at each end. Then bent the flatten copper to an S shape so connect to the battery negative and to the shunt. I've made 2 of those that I've stacked just to make sure it could handle the current. See the second picture. NOTE: It's pretty bright at night, make sure you don't mount the display facing where you sleep. the display turns on when it's charging the battery, or when you're drawing current from the battery. Also note that with only the smoke detector and the monoxide detector drawing from the battery, it does not detect these as drawing any current from the battery and closes the back light and shows that no current is drawn. I'm very satisfied so far, Martin Politick August 2019. ... show more
Reviewed in the United States on August 24, 2019 by Martin Politick
Excellent , simple , accurate unit
Size: 8-120V,0-500A
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. ... show more
Reviewed in the United States on February 19, 2024 by Amazon Customer
Where are my batteries?
Size: 8-120V,0-500A
I currently run a small solar setup to keep my battery charged in my RV. My problem was that I found that I could not judge how much juice my battery had left, simply by the voltage alone. I needed a meter to give me a better idea as to the status of my battery. Solution- I purchased this meter! I installed this meter rather easily. Directions were pretty straight forward. This meter offers most options offered in units three times the price. Accuracy seems to be spot on, well within the advertised accuracy. Setup was fairly easy. I read some of the reiews, and after making the purchase I'd advise the following: Do your research when it comes to these meters. Know and understand what you expect these meters to accomplish. If you are looking for a meter to give you a reasonably accurate real time display of your battery consumption or charge you won't go wrong here. This meter falls short, in of all things, final installation/ mounting. The meter is 54 mm in diameter. The face is 59 mm in diameter. To install this in a wall you aren't allowed much of a "fudge factor" (5 mm) when it comes to cutting your hole. I made a template, actually making it slightly smaller than 54mm, taking into consideration that once you draw around the template you will get the 54mm and caulked it in place. Nonetheless, a good value. ... show more
Reviewed in the United States on August 19, 2019 by M. Graham
Great value for the price!
Size: 8-120V,0-500A
I bought this to replace the 1/3 2/3 full LED indicator that came with the camper that was not accurate and would change depending on how many LED lights I had on. I did some research and came across this meter at a great price. It took me about 3 hours to install this with one trip to the auto store for some connectors and extra 6 gauge wire, but the install was pretty easy and the instructions were good. The accuracy is good giving me the same readings as my volt meter for voltage and current. I like the piece of mind of being able to monitor my batteries without having to pull out the volt meter to get an accurate reading. Also at a glance I can easily tell if the batteries are charging or depleting. The setup was easy to set the Amp Hours of my system and when I plan to add a bigger battery bank in the future it will work just as well. I have used it on one trip since the install and have been using this meter to easily get good usage statistics of my system so I can plan how big my battery bank, and ultimately my solar, needs to be for full boon-docking without the generator. :) I'll try to remember to get some photos of the final install and update this review after a few more outings. Great product for the money! ... show more
Reviewed in the United States on July 21, 2020 by Michael Adams
Really great value! Easy setup and compares to more expensive units
Size: 8-120V,0-500A
Review Image by Joe P
Really great value! Easy setup and compares to more expensive units The best thing about this is that it gives you the information you need about your batteries but costs a fraction of the price of comparable battery monitors. The pros: 1) Super value. The data you need for your batteries without paying $200+ 2) Simple to set up and use (although the instructions could be better). 3) Seems to be pretty accurate. The cons: 1) Materials are someone cheap and delicate. Plan on being careful when installing you could break something. 2) Instructions on setup are ok but could be better. 3) The cable isn't very long and it doesn't come with the required red lead wire. It would be nice if it used telephone cable rather than the 4-core JST stuff. Overall I'm very happy with it after installing it. I don't see any reason to buy the more expensive monitors unless you really need bluetooth... ... show more
Reviewed in the United States on September 17, 2019 by Joe P
Works great!
Size: 8-120V,0-500A
Review Image by Todd A.
Review Image by Todd A.
Working well. Used it for my boat stereo's two 200Ah batteries in parallel (500 amps). It's wired up isolated from my boat starting and house batteries. Worked perfect as a state of charge gauge. Uses about .001 amps with it's backlight off. Instructions are pretty clear on setting it up and calibrating it. I didn't do the discharge to zero just cuz I didn't have a way to discharge them quickly. I fully charged them, hooked up this shunt, and set it for 100% charge which is about 13.3v on these LFP batteries. ... show more
Reviewed in the United States on July 13, 2026 by Todd A.
For the money awesome, with limitations
Size: 8-120V,0-500A
The limitation is that you have to discharge your batteries and set the monitor at 0%. For me with 340 Ah of LFP that is an issue. I also occassionally have one or two batteries, so resetting will be troublesome. I did this with one battery and it seems accurate. In other words, there should be a reset method to set to 100% which would be much easier for me to do. Again, for the money, quite amazing. I actually didn't use the clear plastic mount do to space and logistics and have yet to find a permanent home for the display. UPDATED 8-27-2020. I purchased this on 4/15/2019. After learning more about the device, It is possible to reset to 100%. With the Lithium batteries I have, when charging amps drop to less than 0.2% (170/.02=3.4 A) I can assume the batteries are full and then getting it into the % mode... the right button... then press and hold it again. Bingo 100%. But, now after a year and 4 months of it working well, it has stopped working over night. It shows 0% each morning. Depending on when I look at it it might be back up slightly. This would happen if was disconnected from power or that the battery literally are depleted. Neither is the case. So, I am trying to figure out what is at fault. But, it looks like the meter is. More testing is required. ... show more
Reviewed in the United States on May 21, 2019 by ItsAllAboutTime
Difficult to install. Beware of long wire runs between battery and meter.
Size: 8-120V,0-500A
I was initially excited about this product. There were downsides to it, most particularly the fact that the wire connecting the meter to the battery is only 6 feet long. The other downside is that my batteries are mounted outside my RV. Therefore, critical connections to the meter are exposed to weather. This is a removable issue of course but further complicates installation. So, I extend the wire, waterproof the connections near the battery and hook everything up but the meter works only intermittently. It was a days worth of work installing this and obviously am disappointed. Another matter bears explanation. This meter records both voltage and current. The batteries condition is compared to the manufacturer's amp hour rating but the amp hour rating changes based on draw on the battery. A battery may have a 100 amp hour rating with a 1 amp load but a 50 amp rating with a 20 amp load. Thus, the numerator is imprecise. So, I am returning this meter and reinstalling the twenty dollar Baylite which I also purchased on Amazon. It displays both voltage and current use. For current I can calculate battery capacity on my own. My batteries are rated at 140 amp hours. If I draw 20 amps, I have seven hours of total service until the battery is depleted. Of course, I would only run that load for 3 hours so that my battery capacity remains above 50 percent. ... show more
Reviewed in the United States on August 4, 2020 by wind
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