I want to use this device to measure my House battery in the motorhome. Do I still need to connect the red positve to a separate 9V battery?
326720
Greetings, All of these dual readout digital meters are variants of the "YB27VA" meter. If you do a web search for "YB27VA" you should be able to find detailed information. Having said that, these meters can either be configured to be powered from the measured supply or from a dedicated supply such as a 9 volt battery. It gets a little involved, but if you buy a meter that is supplied with only one connector and set of 3 wires that unit will (without modification) derive its power from the monitored source. If you get a version with 2 connectors it can be powered from a separate source or strapped to the monitored supply. Greetings, All of these dual readout digital meters are variants of the "YB27VA" meter. If you do a web search for "YB27VA" you should be able to find detailed information. Having said that, these meters can either be configured to be powered from the measured supply or from a dedicated supply such as a 9 volt battery. It gets a little involved, but if you buy a meter that is supplied with only one connector and set of 3 wires that unit will (without modification) derive its power from the monitored source. If you get a version with 2 connectors it can be powered from a... » Read More Greetings, All of these dual readout digital meters are variants of the "YB27VA" meter. If you do a web search for "YB27VA" you should be able to find detailed information. Having said that, these meters can either be configured to be powered from the measured supply or from a dedicated supply such as a 9 volt battery. It gets a little involved, but if you buy a meter that is supplied with only one connector and set of 3 wires that unit will (without modification) derive its power from the monitored source. If you get a version with 2 connectors it can be powered from a separate source or strapped to the monitored supply. « Show Less
326721
No you don't need a external power source that's the whole point of this one over other ones that require it red wire is in parrelel with load yellow wire is in parrelel with the shunt along with the ground the shunt is in series to the the load and power source the current is sensed through the voltage drop across the shunt and the voltge is simply measured from the red wire to the black wire last picture has a very simple schematic
326722
i don't know. We got one that didn't have the leads for the battery and never got to use it yet.
326723
It Doesn't work, I wanted to do the same thing. I purchased 3 of these from different sellers, but none would work measuring amps.
2157107
It will give you the voltage for 8 volt batteries. You do not have to disconnect (but the key should be in the off position).
1289945
We generally just use multimeters and/or Hydrometers to check batteries, I don't think this has that capability. It's great for charging though.
611639
i dont know.just hook an ammeter in series with it and a battery and you'll find out
483555
Mine is mounted inside the RV but I can't imagine that it is just by looking at it. Also, I regret buying it. It really doesn't tell you much important information. The better solution I've figured out is to buy a shunt. This would be the only way to accurately know the real amount of power that your batteries have left.
1489589
Connects directly to battery Positiove and negatiove posts..........I suggest using a heavy duty fuse which is flat and has a clear fuse box.also thru amazon. Easy install. It does coem with cables.
1784817
I have one above the door on my motorhome to see who is at the door. so as long as you have 12 volts their should be no problem,excellent idea.
159698
I connected mine directly on the battery but I'm sure either way would work fine.....make sure to connect the positive first (just a habit from jumper cables).....also remember that the instructions specifically say to plug in the unit AFTER it's connected (eg. don't connect it while it's powered up)!!!
1654126
I would not do that. I don't think it will give you a true reading of the battery condition. I ran a dedicated pair of wires from Positive & negative battery terminals to the meter. I installed a small toggle switch on the dash & broke the negative wire thru it so that the meter only draws current when the switch is on. otherwise it is always draining the battery. Hope this helps.
1880651
Apply battery + to the Vin lead at 7.0V (i.e. a 9V battery or wall wart) or greater (but less than 20V). Attach both GND leads to battery negative. Do NOT power the device by applying battery voltage exceeding 5V or under 4.5V to the 5V pin or you'll destroy the regulator and possibly the entire device.
1221920
If checking external batteries red (positive), black (negative) main battery, this powers the meter. Third wire to positive terminal of battery being checked and a separate wire from negative on main battery to negative on battery being checked. Have fun.
1302027
Yes. Rechargeables are slightly lower voltage. Hence you need a true "battery tester". This is a batter tester. Not a voltage meter.
1619730
No. Just hook it up directly to the 12volt battery posts. I have owned mine for some time now and it works very well to keep my RV auxilliary battery charged.
1656007
Yes it does require a totally separate power supply for the volt amp meter then the battery you are measuring.
9941
I measured the output of mine plugged in to my motorcycle connection. 12.97 volts going in from the battery, output 5.1 volts so the spec from the Battery Tender website is incorrect.
478376
If u run off your car battery I would keep your eye on voltage gauge. I use it in a tractor with opti idle so I don't worry about it draining my batt.
812108
You can connect the appropriate sensor to the central unity using the wired outputs in the back (look for sensors with standard normally open/closed outputs). You can connect these sensors to the Mace Door/Window Sensor as well, replacing the magnets for the temperature sensor and using it as a remote control to call the central. If the power goes out it will remain working as long as the 9v battery lasts.