What's the output voltage? Is it possible to overcharge 12V car battery with this? Edit: Product manual says 19V open circuit and 15V working voltage. Whatever that means.
1563979
No, Open circuit means it is disconnected or has no load. When you hook it up to your battery or a load it will only charge until there is no differnence in potential (Voltage) at a maximum rate of 5Watts. Your car's alternator charging system uses about 15.5V to charge your battery when the car is running and a fully charged battery will reach about 13.5V. Also note that the voltages are maximums (so when it a full sun exposure).I have this device and with direct sun I can charge 2 cell phones, not too bad
1563980
I think that the voltage is about 15 volts. I leave mine charging my RV battery andhave no problem with it. It stays charging for months at a time.
1563981
the output is wattage and its 5 watts- while I would never say never it is highly unlikely you will overcharge a battery with it- it does not put out enough amps (260mA) to sustain high rate of charge- I keep it on my motorcycle battery thru the winter only charges when in direct sunlight and the more the better
1563982
I no techie, but I have been using this for about a year and I've not had any problems. I honestly don't know what the 15V or 19V means. I don't think you'd have any problems with a 12V car battery. My deep cycle battery was totally dead and one day in the sun and it was all charged up.
1563983
No, Open circuit means it is disconnected or has no load. When you hook it up to your battery or a load it will only charge until there is no differnence in potential (Voltage) at a maximum rate of 5Watts. Your car's alternator charging system uses about 15.5V to charge your battery when the car is running and a fully charged battery will reach about 13.5V. Also note that the voltages are maximums (so when it a full sun exposure). I have this device and with direct sun I can charge 2 cell phones, not too bad
833110
The output of 3 volt can be done but I am not sure about 12V I would need to do a test. Will keep you posted.
1471738
Hello: I'm guessing you have the 18 volt unit in which case a 19.2 volt will not work. It is very important with these types of batteries not to overcharge by leaving battery in charger longer than instruction manual states. May also be charger problem.
185471
These lamp substitutes are resistively ballasted and I would not expect them to survive at any DC voltage above 15V. If radio frequency interference is not important, there are better choices efficiency wise and light output versus charging/discharging. A discharging 12V "house" battery is at 13.4 volts or less, usually between 12.6V to 10.6V (lower cutoff). These, or similarly passively ballasted design, are a "must" if you want use a HF radio with the lights on. I haven't had any fail and they operate much cooler than the 1156's they replaced.
1758261
I have measured the voltage to the battery on my trailer and this unit maintains 13.5 volts. I run a winch to load and unload cars from my trailer and find I have plenty of power and the voltage doesn't drop. From that I can only assume that it would operate a 12 volt light with no problem.
838170
As I understand it the GBT-500A provides a load when testing the battery rather than testing open circuit voltage. As such I doubt that it would work with your 7.2V battery. Using a volt/ohm meter (VOM) will give you the open circuit voltage which probably should be greater than 7.2 volts on a charged battery (given a 12V car battery is about 13V open circuit fully charged). With a 450mAH capacity I don't imagine it is a very big battery (assuming it is milliamp-hour). If the battery has a recharger it may tell you more than the VOM or GBT-500A
435546
i don't know about the output, i ordered 11.1v because that was the one i wanted. you might have to contact the sellers directly for that information
1784691
You don't need a controller because this unit does not supply enough amps to overcharge a regular sized (car, boat, etc.) battery. If you test the voltage under no load it may scare you because it's too high, but if you apply ohm's law and understand that the current is limited by the capacity of the unit, you'll find that the voltage under load is only a couple of tenths of a volt higher than the battery in its disconnected state.
1187554
Sam.. I use this battery for audio system.. I checked before I used and was fully charged.. It sits at 12.4v.. I use that inside of the vehicle bcuz does make the gas that a wet cell battery will.. So far work rly great it can handle 6000 wtts fine of my subs (also changed my alternator to a 170 amp one)
1488700
There is a setting for 12volts but I wouldn't use this tester for a car battery. I would would either use a load tester or take it to an auto parts store or garage and have them test it.
849510
Sorry Kathy W. I just now found the notice of your question. I hope you got the help you needed, however since winter will be coming back around again I chose to give my answer just in case it might be of help. In short... No...However if you are talking about a good vehicle battery it is possible to use an inverter (DC-12V to AC-110V) I would not recommend a cheap one though, so it would be an investment but is very useful to run most household devices, i.e. toaster, lamp, laptop....I wish you well.
1684397
And the sticker reads: 2.0A for BOTH the 5V and 12V output ratirings. Really a neat product. I will be fixing a friends laptop, just pulling it out of the case, setting this up and using their HDD as an external and it has always worked. This is my third order of the same product from the same source, always the same professional response. Hope this helps you. Will
146784
the output voltage should be 4.2V and output current 300 mA. if you look carefully at the picture you can read this, but it is wrong in the product description. the 12V refers to the car charger input voltage. why 4.2V for a 3.7V battery? it is common for chargers to be at a higher voltage than the battery it is charging. there are sensors that detect what voltage the battery is at and once the battery is close to charged the charger lowers the current applied to ensure that the battery is charged thoroughly and quickly.
877112
Yes20v max and 12v max are the only batterys that work in that ratio.18v dont work in that ratio.But the reception aint good.
1488703
I guess if you know what to look for, you can try it. If your car battery is only showing 12 volts on any test device, it's probably not going to start your car. When I worked on my own vehicles and built hot rods, we always wanted between 13.5 and 14.4 volts for a full charge indication, with the engine not running. Car batteries have to pull a heavy load when starting a cold engine. That's why the "cold cranking amps" are shown on the sales shelf. If you really need to know about your car battery, I would not fool with this tester as a serious tool. I would be willing to bet, the 12 volt battery they mean on the test setting is your car alarm remote or wireless doorbell battery in the button module. I guess if you know what to look for, you can try it. If your car battery is only showing 12 volts on any test device, it's probably not going to start your car. When I worked on my own vehicles and built hot rods, we always wanted between 13.5 and 14.4 volts for a full charge indication, with the engine not running. Car batteries have to pull a heavy load when starting a cold engine. That's why the "cold cranking amps" are shown on the sales shelf. If you really need to know about your car battery, I would not fool with this tester as a serious tool. I would be willing to bet,... » Read More I guess if you know what to look for, you can try it. If your car battery is only showing 12 volts on any test device, it's probably not going to start your car. When I worked on my own vehicles and built hot rods, we always wanted between 13.5 and 14.4 volts for a full charge indication, with the engine not running. Car batteries have to pull a heavy load when starting a cold engine. That's why the "cold cranking amps" are shown on the sales shelf. If you really need to know about your car battery, I would not fool with this tester as a serious tool. I would be willing to bet, the 12 volt battery they mean on the test setting is your car alarm remote or wireless doorbell battery in the button module. « Show Less
1157878
Regardless of what vehicle it's in or if it's running packs in parallel or series I've always stopped at 3.6v/cell when the pack is at rest. You could possibly go lower and still be safe, however I noticed that my packs lasted a lot longer stopping at 3.6v/cell. Also I found these alarms to be rather quiet. Just a heads up. Enjoy �
71110
I have it plugged in to a 4 way plug which in turn is plugged in to my only available port. I have 2 other things plugged in to this also and have had no battery problems. It states that it is 12V. I don't know if this answers your question or not. My car (2011 Honda CRV) automatically shuts all power off to the charger when I turn the car off so I have no worry of battery drain.