Does anyone know if this ammeter will display negative amperage? I'm looking for something that will show both charging and discharging amperage.
1306064
Mine didn't show anything after it blew up in a puff of black smoke.Junk! Save your money and find something else.
1306065
I don't think that it will. When I initially installed it I had the wires switched on the shunt (which would have just given a negative value) and it showed zero for the amperage until I corrected the shunt leads.
1306066
I used it for an RV house battery, and was disappointed to find that it did not show a charge rate, only the discharge.
792506
Bad connection??I haven't had this happen. Been using the gauges about 2 years now.If voltage is right around the cutoff of 4.5V I suppose it could blink on/off as the voltage hovers around that point. Gauge puts a tiny load on system so volts would drop, then without the load V would increase again over 4.5V so it would light up again, and the cycle would repeat.
651896
Yes. Mine did the same thing. I tested the batterie and found the two in the front weren't as strong as the ones in the back. I rotated them front to back and charged them and the gauge has worked every since. Hope this works for you.
1036
Hi Shane,as you know these meters are very sensible. Off 2 Amps looks like mech. damage. When you move the meter the needle should move free in either direction. There is a black plastic screw below the gage. Here you may adjust the needle, but not sure whether such a large misalingement of 2 Amps. Does the Ampmeter works anyway????Good luck my friend
51076
Yes, I am busy using it to indicate the charge coming from a bank of solar panels. I am going up to a max of 42A (using the 200A shunt) - it does not seem to give a reading at low currents e.g. 1A but once it goes over this it is pretty accurate. I am using the battery that I am charging as the supply and it works fine.
322393
I doubt it very much. The meter requires power from the USB charge port. If you removed the power from the charge port to see if there is a discharge, the meter would not be powered. Your best option would be to modify a USB cable and connect in a milli-ammeter
2236289
I've never seen that indicator on my tester. Low batteries is my best guess. Try emailing the manufacturer and see what they say.
1936720
The meter must have its own, separate power supply. I use a 12vdc transformer plugged into my inverter and it works great. I am able to monitor amps used by the inverter and other DC loads connected to my batteries as well as switch to see battery voltage. If you already have a separate power supply, you may have a bad meter.
1509145
I've only used it once and don't know which one I used, but I did read about the amperage in some of the product reviews. I think you'll find your answer there.
1401025
Who knows how accurate these cheap gauges are... Checked mine with my analog meter: slightly more than 12 volts at the battery - perhaps 12.1 or 12.2. 12 volts at the terminals on the back of the gauge while the gauge read a hair more than 12. Yours might be different of course.
928275
Sherman, Sorry I can't answer your question with I have done it answer. I have used this unit very little since I purchased it, and it was just to slow charge a new battery. My thought however, would be that the needle should rest in the "Start Position" when that dial selection is made. Meaning you are requesting full output amperage. There other factors that could cause the amp gauge to read inaccurately; Shorted internal battert cells, battery present state of charge, incorrect or bad connection. I would contact schmacher technical support to get an answer.
1933167
It works well for testing cable resistance, you can measure the drop in voltage at a steady current measuring at the start and end of the cable with the same load. You can also check the voltage and current with a steady load with and without the cable being tested. Some well made long cables I tested performed much better than generic short cables for charging, appearances could be quite misleading. I found most cables badly affected charging performance especially with higher current draw devices like iPads. It was common to see charging rates drop by more than 30-50% even with shorter low performance cables. Make sure you power the USB Power Meter up for at least three seconds before plugging in the load to give it time to calibrate.
2269572
Regardless of anything it should show 12 volts. You need to use the amp feature on you're volt meter to measure amps. If its only reading 1 volt then most likely the charger is busted or you're volt meter.
2228759
The voltage is not specified in the operator instructions. The 2.1 indicators apparently refer to amperage, according to the information I discovered.
1186802
I don't have an ammeter so can't be precise here. My battery hasn't ever taken "all" of its blinking lights when charging. I haven't ever run it fully down so cannot estimate how much capacity it stores when full, but have run both my iPhone and iPad for a few hours on it and it didn't fully discharge. Overall I'm pleased with it even if it's below the advertised capacity of 50K mAh.
467189
You might be disappointed. Meter can measure down to 10 micro amps according to the manual.
1320398
Check your power source going in and make sure you have something in the area of 120 volts feeding your driver. Make sure your connections are clean, that there isn't a lot of shielding wrapped up in the wire nut. How far are you from the driver when measuring? If you're measuring at the driver and only reading this, have good connections, and your power source is around 120 volts, it could be the driver. Are you sure your ammeter is working well. Bad leads on the meter can give you erroneous readings.