Won't it overcharge a 12V car battery? "Cut-out voltage" is 13V, right? So it'll charge and charge it. Car battery IMHO never reaches 13v.
651659
Car alternators charge at 12+ volts too. The battery will not be harmed. I have been charging a 12v bank for over 6 months now.
651660
it's just like the voltage regulator in your car alternator. reaches over 13volts and tuns off, and goes back and forth. will not over charge.
651661
13.8v to be exact! lower than 11.8 and your battery is toast! cars charge at 13.8vdc . this has a cut out at about 13.8vdc at this point it will cut off charging the battery bank and sends it to the load. Load can be a 12vdc light bulb, or an resistor that changes the power to heat energy. anything that runs on 12vdc can become a load. Thus this saves your battery bank. It is like having an automatic switch from battery to load. When the batteries drop to about 12vdc it will switch to float mode and keep batteries fully charged.
651662
When I first saw this product had a cut out voltage of 14.2 i thought 'hey that's low...' in my humble opinion(the only meaning of IMHO i know) you should look into the difference between charge types, float, bulk... then you will understand the numbers on this unit, and your batteries a bit better.
651663
No. it will cut off. a Car battery runs on average 12.8V. With this sunforce controller, it shuts off at about 13.2. When you use a alternator it can reach up to 14.56, but only discharges 12v of power. If the batteries are goo, it will work. I currently have a set up on my sailboat with a 100 watt solar panel puuting power through two sunforce controllers to two batteries. Like this for a year now with no issues.Dale IMHO means "IN MY HUMBLE OPINION"
651664
Car batteries need what is called a positive bias, or a higher voltage than what the battery is rated at. Your car will charge it at 14.5 volts. The solar system will use around 13.5. When your battery is fully charged, it will read 12.7 on a volt meter. I don't know what IMHO is. The Sunforce unit will work great
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
565521
Your assuming it works at all, which mine does not. I'd guess the fifteen minute charge is MAYBE 10% of capacity. The batteries which come with it seem to charge as expected in another charger I have, but the bulky over sized charger is just short of useless. Now if you get a charger that works here(USA) then with the proper adapter it should work. Note also it comes with a 12v cigarette lighter charging cable so if you had access to a car and the thing worked in the first place you could charge that way.
1725613
I don't know but I've learned if charger says bad battery & shuts off if you can put a little charge in with an older charger, this charger will then take over & gradually bring that battery back from the dead. my charger model is 12 v only and relatively low camps, but it has restored several batteries for me if given the time to work.
247971
No, its a trickle charger and the current isn't enough to cause an overcharge. I have left it connected for long periods with out ill effect
1866436
That's a question for the seller but in my opinion that's only for external charging internal charging of a vehicle has a voltage regulator, only thing I can think of but again I'm just a consumer like you.
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.
1171804
No, it will not charge the dead battery. This device gets its power from car battery so it could charge your other electronic devices like cellphones, tablets, etc. If your car battery is dead you need to jumpstart it or get battery charger.
659526
Yes! it is excellent for car batteries and will maintain the charge without overcharging. - Len - 661-245-2000 - Racecrafters-USA
943268
No, you can not over charge the battery. It does not have a charge controller but it has a voltage regulator that prevents overcharging (additionally, it keeps power from the alternator from reaching the panel). I have had mine plugged in for 7 months straight and can even drive with it connected with no problems.
2034704
Yes, it charges from your cars cigarette lighter port... I used aligator clips to charge from another 12 volt source... if you do try that make sure you dont hook it up wackwards (like I did)...luckily I only blew the fuse in the charger.
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.
1060028
No. It isn't a charger, it is a jump starter which means that it is just another battery used to temporarily "boost" the battery in the car that is weak. While this jump starter has a built-in charger for it's own battery, it cannot be used to charge your car battery--the selector switch/dial can either be set to "jump" (on) your car battery or "charge" (off) to charge itself, it will not allow the charger to function while the jump battery is connected to your car battery.
720189
It will charge a dead car battery with in 13 hours depending on the battery's capacity. It will not jump start a car though.
340531
Probably- it puts out gobs of power. However, different battery types have different charging profiles- the current supplied needs to change as the battery voltage rises; just ramming electrons in until the battery voltage is where it should be will probably damage the battery. If you use a charger DESIGNED FOR YOUR TYPE OF BATTERY you should be OK. The power supply can supply the juice, but the charger has to control the process and protect the batteries.Even cars have Voltage Regulators to control the charge rate to the battery.Hope this helps.Bill K3DC Probably- it puts out gobs of power. However, different battery types have different charging profiles- the current supplied needs to change as the battery voltage rises; just ramming electrons in until the battery voltage is where it should be will probably damage the battery. If you use a charger DESIGNED FOR YOUR TYPE OF BATTERY you should be OK. The power supply can supply the juice, but the charger has to control the process and protect the batteries.Even cars have Voltage Regulators to control the charge rate to the battery.Hope this helps.Bill K3DC
529940
Oh you mean 12v for the car. No it doesn't. I just got an adapter from Radio Shack and I can charge on the go...
1254326
It doesn't charge, it's an inverter which means it uses your car battery to run electronics that would normally plug into your home outlet. It only works when connected to a car battery.