DROK Bidirectional Volt Amp Meter, DC 0-90V 300A Voltage Current Battery Capacity Amp-Hour Watt-Hour Power Time 7-in-1 Monitor Tester Color LCD Display Multimeter with Hall Sensor 50cm Shielding

I have two of these. Yes the manual is a little difficult, but how well will you write a manual in a different language? The units are small and a challenge to configure, but once done, you will like it. I purchased the first one a few years ago and it has not failed yet. It was used to monitor the in/out voltages and amps from a cheap Harbor Freight charge controller. Since then, I have purchased another one to use with another solar project. I have also used it in connection with my large array, though not needed, it was more blinky lights.The relay trigger that is built into this has not been used yet. I may use it in the future with and Arduino solar project I am working on.The input voltage should be calibrated to match your digital voltmeter. I suggest clipping them both to the same source simultaneously to achieve this.

it does what it claims to do. seems pretty accurate. nothing "fancy" but extremely functional.

i bought this to test some wind turbines, so far, i have only had time to test one.these readings and data may be subject to reset, but so far i have not seen that as i have not lost power. the unit is well made, the instructions are surprisingly cleari only have one, and it is working about a year now

This unit is not what it appears to be. If you want to use it to actively monitor battery usage for more than a single discharge (just so you can find out what your battery is capable of), THIS IS NOT FOR THAT PURPOSE!It's sold like a battery monitor, using a Hall effect sensor for current monitoring and as a unit with battery capacity monitoring, bidirectionally. Well, it sort of is, but isn't. Here's the game they're playing... It has settings for adjusting voltage calibration, getting accurate current bidirectional measurement, and lots of other relay-based functionality. What is is NOT is a battery charge monitor. You can set the AH expected from your battery, and it will monitor it and display a percentage, but as soon amperage drops to near zero (matched in/out or just plain not using anymore), it resets the AH gauge to the max and shows Watt-hours used in the last session. IT DOES NOT monitor battery percentage for more than testing purposes only. Single time test. Then the numerics reset. Let's say you want to say you have a 200AH battery and do a controlled discharge. Once it gets to zero, it won't even show you how much more you got than 200AH.This is far oversold as a device that performs functions that it does not, and the documentation is VERY poor and extremely incomplete. If you want to use it just to run your cables through a Hall effect ring and have it show the amperage, it's good for that. It an also display hard-connected voltage (OMG!) They're playing the "bad English" game of adding and miswording functions to give an impression of it being a device that it isn't. They're not an American company, so false advertising is okay.Oh, and they accept returns just fine, but only if you drive it to an approved location (Amazon, etc). When attempting to return it, you'll get horrible English that makes it sound like they've done nothing wrong and you're just not using the unit right. Typical. Spend a few more dollars (literally, about 10 more) and get a device that is an actual battery monitor.

I have used the Drok ASIN ‏B08HP5VD4M (Watt Meter DC 0-300V 200A ) for applications, it it does a very good job for the price. This particular meter reads close to the values of my Fluke DMM.As a controls systems engineer, I expect the display to hold to standards such as the meter mentioned above. Also, when trying to contact Drok, there is no way I can do this, I thought I could help them with design, we speak fluent Chinese science.This meter does not have a negative sign on the display next to the amperage measurement value to show the flow of amperage. For example: Out of the battery is negative, into battery is positive (no sign on the value indicating flow direction).Rather, they have an indicator that is not intuitive at all next to the OUT value on the display. Thus, I am disappointed with this purchase due to the lack of instrument convention making the reading non-intuitive for understanding the direction of current flow.This is my first impression, I have not checked the remaining functions. Just thought I would report due to my disappointment with the layout of the display and not being able to contact the company to try and help them in the USA market.

In my first setup I have a wire charging the battery and the 2nd wire pulling power from the battery and put them both through the sensor. I noticed the readings are not correct. Then I read a user asking a question regarding the same configuration and was informed that this will cause some problem. After that, I revised my wiring so that only the 2nd wire pulling power from the battery went through the sensor and the wire charging the battery was connected to this 2nd wire but before it went through the sensor. Now the display shows the direction of the arrow corresponding to whether the battery is supplying power or it is being charged by the controller.Also, I learned to reset the battery graph/values by moving the yellow dot past the LOP option then press OK once. this clears usage data. Toggle the battery display with the OK button.Going over other peoples comments really helped me a lot.

Cannot see Direction of Current - Charge or Discharge

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