1- Can I connect a solar panel of (20 to 22) volt direct to the 12 Volt Battery without controller in order to charge it? 2- My solar panel is 75 Watt. What can be its amperage of charging a battery of 12 volt?Thanks 1- Can I connect a solar panel of (20 to 22) volt direct to the 12 Volt Battery without controller in order to charge it? 2- My solar panel is 75 Watt. What can be its amperage of charging a... » Read More 1- Can I connect a solar panel of (20 to 22) volt direct to the 12 Volt Battery without controller in order to charge it? 2- My solar panel is 75 Watt. What can be its amperage of charging a battery of 12 volt?Thanks « Show Less
490724
1. You should use a charge controller to reduce risk of damage to the battery. 2. probably 3.3 amps but no way to be sure without seeing the label or cell spec
1332100
The charge control can handle up to 7A. Your 30 watt panel puts out ~1.68A at high noon. You should be fine with one charge controller charging two or more batteries and it would require more charge time. Just make sure you hook up your batteries correctly. Personally and for convenience I would much prefer to get two charge controller with two solar panels for the two batteries so that I could avoid having to move and or reconnect the batteries. A larger solar panel can would benefit you quite a bit if you need to drawn power from the battery each night. Hope you are using deep cycle batteries.
1955408
I have five 100 watt panels now, wired together with MC4 split connectors and running 25 feet to my charge controller. My panels have a working voltage of 18.5V. That gives me 5.5 amp per panel in direct sun. In total I get 27 - 28 amps on a clear day. I have no problem with voltage drop but I am now max'd out on my 30 amp charge controller and the 10 guage wire. If you have a larger system than that you will need heavier wire, unless your panels operate at a higher voltage, wich would lower your amps. As long as you are under 30 amp this wire works great. I hope this helps.Dan
2284137
Depends on the wattage. This unit is good for 20amps. It auto switches from 12 to 24 volts so the wattage capacity will change. Remember the E=IXR rule. Voltage=Amp X Watts. Wattage divided by the voltage will give you amperage. 12volt system,,,,, 20a X 12v=240watts of solar panel ,,,,,,,,,,,24volt system,,,,20a X24V=480Watts of solar.
933676
Because the voltage is 40 volts, you need to buy a voltage controller that accepts input for 24 volt or 12 volt. and the output for the battery will be 24 or 12 volt. The voltage controller will automatically detect the input voltage of the solar panel and will automatically detect the battery voltage. I have purchased two of these items on amazon. However, One seller was in Shanghai and the other in Hong Kong. you can get 30 watt or 60 watt. Blue Solar was the name of one of them. I did get both delivered after a while.
2242775
You won't want to connect the panel directly to a battery, as it could damage or overcharge it. The panel itself only provides a voltage, you need a charge controller between the panel and the battery. The one I used (http://www.amazon.com/gp/product/B001HWQZNQ/ref=wms_ohs_product?ie=UTF8&psc;=1) is not currently available, but should give you an idea of what to look for. You want a controller that can handle at least 30 watts and 17.5 volts input for charging 12v batteries.
1385397
lets say your battery is at 11v and a high sunlight charge from the panel pushes in 13~14v, the read on the battery will show a "soft" 12v. the shade comes in and the battery goes back to 11v. Next time you see it, be amazed to see how many amps your controller cranked up.
2242776
You won't want to connect the panel directly to a battery, as it could damage or overcharge it. The panel itself only provides a voltage, you need a charge controller between the panel and the battery. The one I used (http://www.amazon.com/gp/product/B001HWQZNQ/ref=wms_ohs_product?ie=UTF8&psc=1) is not currently available, but should give you an idea of what to look for. You want a controller that can handle at least 30 watts and 17.5 volts input for charging 12v batteries.
1123835
I agree with most all said here before. Get 2 12v batteries in series = 24v, or 4 6v and hook up in series but controller is best way to go to match your solar panel. Most quality solar panels will charge 12v and 24v. Get a volt meter and check it out as you go. A fuse is a must. Good luck
121290
Most larger, more powerful panels are 24-volt. A good charge controller will automatically step the 24-volt down to a 12-volt battery. I don't know off hand if the HQRP will do it -- it seems to say that it does, but you might want a more expensive controller, a MPPT controller. Also, if you have 150-watt+ solar panel, a 10-amp charge controller is too small, as you probably already know. You'll probably want a 20 or 30 amp.
1581548
I'm guessing that the solar panel is the "Source" and the charge controller is the "Load". If so, if the panels are indeed putting out 335 watts, and the voltage is 16.65V, you should be drawing 20 Amps. Perhaps it is a poor connection, or the charge controller is not allowing any current to pass through. If you have a standard multi meter, you could measure the current by allowing the red wires to feed through the meter. (be careful, many meters can't measure more then 10A, and if indeed 20A are flowing, that could burn out the meter.)I use my Watt's Up meter to measure drain from Li-Po batteries connected up to brushless motors and it works great. I'm guessing that the solar panel is the "Source" and the charge controller is the "Load". If so, if the panels are indeed putting out 335 watts, and the voltage is 16.65V, you should be drawing 20 Amps. Perhaps it is a poor connection, or the charge controller is not allowing any current to pass through. If you have a standard multi meter, you could measure the current by allowing the red wires to feed through the meter. (be careful, many meters can't measure more then 10A, and if indeed 20A are flowing, that could burn out the meter.)I use my Watt's Up... » Read More I'm guessing that the solar panel is the "Source" and the charge controller is the "Load". If so, if the panels are indeed putting out 335 watts, and the voltage is 16.65V, you should be drawing 20 Amps. Perhaps it is a poor connection, or the charge controller is not allowing any current to pass through. If you have a standard multi meter, you could measure the current by allowing the red wires to feed through the meter. (be careful, many meters can't measure more then 10A, and if indeed 20A are flowing, that could burn out the meter.)I use my Watt's Up meter to measure drain from Li-Po batteries connected up to brushless motors and it works great. « Show Less
63412
You Need A Charge Controller. Connect Your Battery And YourSolar Panel(S) To The Charge Controller.The Gauge(Thickness) Of The Wire Depends On The Distance From The Charge Controller To The Solar Panel And The Battery.You Should Be Able To Find Some Images online.
34730
I have six 100 watt Renogy panels wired for 24 volts. The meter that came with this controller reads almost 40 volts. It varies from 30-40 volts depending on battery state of charge (I am using six deep cycle batteries...12v). It works great. Additionally, I have pulled 34 amps down from the high sun which equates to around 815 watts. My unit has NEVER shut itself off. When the batteries are fully charged it will still provide power to your accessories. I am using an DC-AC inverter...so, it really doesn't matter.
1031235
The whole point of this type of controller is to take your solar power of any voltage up to 48 volts (in this case) and output the proper voltage 12 or 24 volts to your batteries. Your panels do not need to be 12 volts, they simply need to fit in the specs of the controller which is a 48volt maximum input voltage. It will then regulate your output voltage to 12 or 24 volts, whichever you choose.
990640
You can charge your battery. You will need to get a charge controller to convert 24V to 12V. The controller will also prevent overcharging of the battery. Get a controller rated for 10 amps or more. I don't know how long it will take to charge one battery. This is a powerful panel, and would likely charge in one day or less.
2215261
The goal of using an "MPPT" (maximum power point tracking) controller with a panel like this is to automatically detect how much power you can get (in both volts and amps) from the panel, then take that and put out as much power as you can to the battery you're charging. On many panels like this, the actual optimum output (to get the "50 watts" it's labeled as) is at something like 19V & 2.6 amps, yet charging a typical 12V battery (which is "fully charged" at 14-14.5V) would mean that just connecting it directly only gives you ~40 watts with the 2.6 amps at ~14V. An MPPT controller will take in that 19V 2.6 amps and give off ~14V 3.3 amps where both of those powers are ~50 watts, but are obviously different V & A ammounts. So being able to take in all the power you can (but not be virtually "shorting" out the panel) as well as "transform" all of that to the best voltage & amps takes a lot more circuitry than a cheapy controller that just "switches on & off" based on reaching the battery "full voltage" level (or detecting a drop in battery voltage). You can choose to design a controller intended to be able to handle 100 watts, 500 watts, 1000 watts, or any other range you want (which can be for certain size panels and/or battery sizes). One MPPT controller I have even says it can take in power at 19V, 38V or 69V from panels and then put out power to a battery bank at ~12V or 24V systems (and will automatically detect the power from each of those systems & adjust things internally having the same "input" and "output" connections for any system). Of course you still need higher input voltage than output, so you can't charge 24V batteries with only 19V input (unless you can come up with a way to "transform" things in that manor). Hope you can come up with a fairly efficient circuit design.
1636541
Most 100 watt panels are about 5 amp. I use 2, but I also have 4 - 6 volt batteries and a charge controller connected. I am not sure if that is needed.