The Quick Charge 120 Volt Digital Meters are quality units, made in the USA, and they meet our accuracy requirements, which, many units do not. They have voltage range indications printed on the unit, helping to determine battery state of charge. This is much more accurate than a bar graph LED read out. The digital reading can also be used to determine proper battery charger function, and if the charger is functioning at all. These are mountable, or can be used as a portable meter, and are excellent for golf carts, industrial carts, industrial equipment, EV use, or any 120 volt battery system. Picture below is a 24 volt unit.
Quick Charge 120 Volt
Digital Volt Meter
|Box Dim (LxWxH):||4.0 x 2.0 x 1.2||Mountable|
|Actual Weight:||.6||Digital Display|
|Ship Weight:||2.0||State of Charge Graphic|
|Range:||105.0 to 156.0 VDC||Alligator clips & rings|
|Warranty:||3 Years||Made In USA|
A lot can be determined by knowing a DC system voltage, both at rest, and when being charged. This requires an accurate digital volt meter, at least to the tenth of a volt. You would think in this digital age that any digital device, particularly a meter, would be so. This is not the case. The Quick Charge digital meters are built in the US, and are accurate. Knowing that a 120 volt lead acid (or sealed lead acid) battery pack is fully charged at 127 to 128 volts (depending on the battery construction), and is effectively discharged at about 119 volts, the state of charge can be determined by an accurate voltage reading to the tenth of a volt, and comparing to known values. If you have a 120 volt battery system that never reads above about 125 volts, after a charge cycle and resting period (about 12 hours), you have a battery pack with diminished capacity, and is either on the verge of failure due to age (chemically worn out), or is sulfated enough to cause the capacity problem. Sulfation we can deal with. Chemically worn out is worn out, and unreliable. Maximum battery life is accomplished by minimizing time spent in a partially discharged state (like a golf cart left unmaintained over the winter). We like these units for golf carts and industrial carts, to help monitor state of charge and charger function.
As for battery charger function, remember, chargers work by forcing energy into a battery and exceeding its resting voltage. So, if you put 11 volts to a battery that is sitting at 12.1 volts, no transfer of energy (charging) occurs. Generally, 120 volt battery chargers will go up around 147 volts in the final stage of charging, to cram that last little bit in and fully charge the battery pack. Going too high can damage the battery. If you get a voltage reading from your digital meter, and then turn on the battery charger, the voltage should start rising. It may take some time with a large battery/small charger combo. If you never get a voltage rise, the charger is not working properly (we assume you have a viable battery pack, because it registers on the meter). If you monitor the volt meter, you should see the voltage rise to the 'absorption' voltage setting of the charger, then drop either to the 'float' voltage setting, or slowly drop to the 127 to 128 volt fully charged battery range. This is useful information to have available.