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
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
243040
Frank, i have a Renogy catalog on front of me and don't see a 350 panel. This must be something new. And by 30amp charge controller I assume a PWM charge controller. Your panel can be 12 or 24v not both, unless this is something really new. You might try one of the solar forums or email Renogy support. Don't call tech support because i tried. Don't. Ok? Try Northern Arizona wind&sun or midnite solar forums. Also midnite solar has videos on youtube about everything. You should be able to charge a 12v battery with a 12v panel and charge controller-period. Unless the battery is no good. Put a voltmeter at the output of panel then the output of charge controller. Good luck.
232512
Use a 45 watt panel connected to battery with controller. Would not recommend direct connect (solar to pump) unless very small panel. Try a 5 watt and see. This still might be too much electricity.
1946038
Run the solar panel connection to the charge controller, then from the charge controller to a 12 volt battery. Works great for me running lights at a deer camp.
1332096
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. 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... » Read More 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. « Show Less
1842003
Unless one has extensive knowledge of Solar panel and the Battery and Know how Solar Electric Systems work. I Do Not Recommend Charging a Battery without a charge controller. This panel is a 24v panel and will charge a 12v battery provided a MPPT charge controller is utilized. Appropriate MPPT charge controller for this panel would a Morningstar SS-MPPT-15L, this charger can accept up to 36v from the solar array and can charge a 12 or a 24v battery automatically.
838605
Positive wire and negative wire go directry into special plug in the controller, then two tray wires (sold separately) go directly to the battery positive and negitive. Easy as putting batteries in a flashlight. Renogy had a utube video. It's so easy. If you wanted to later add more cells, you would need a bigger controller, if you wanted more than 200 watts of solar cells then you would need another battery. If you wanted to plug something in using ac power you would need an solar power inverter. As far as a DC ground, a battery is 12 volts, as long as you use 12 volt items you should be dandy!
1318351
The instructions doesn't give enough explanation. I called the company for my inverter and asked if solar is compatible with their inverter hooked up to the charge controller. They said to keep the inverter connected to the battery. The only thing I can think of is using a 12 volt light or a small apliance could be connected directly to it instead of using the battery power. If a 12 volt light is connected directly you are taking advantage of the solar imediatly. If the same light was connected to the battery instead, the charge controller doesn't let the solar charge the battery until it drops to a certain voltage. So solar panel isn't being used to its full advantage. The instructions doesn't give enough explanation. I called the company for my inverter and asked if solar is compatible with their inverter hooked up to the charge controller. They said to keep the inverter connected to the battery. The only thing I can think of is using a 12 volt light or a small apliance could be connected directly to it instead of using the battery power. If a 12 volt light is connected directly you are taking advantage of the solar imediatly. If the same light was connected to the battery instead, the charge controller doesn't let the solar charge the battery until it... » Read More The instructions doesn't give enough explanation. I called the company for my inverter and asked if solar is compatible with their inverter hooked up to the charge controller. They said to keep the inverter connected to the battery. The only thing I can think of is using a 12 volt light or a small apliance could be connected directly to it instead of using the battery power. If a 12 volt light is connected directly you are taking advantage of the solar imediatly. If the same light was connected to the battery instead, the charge controller doesn't let the solar charge the battery until it drops to a certain voltage. So solar panel isn't being used to its full advantage. « Show Less
392411
Hey James - you can use any size solar panel as long as you use a regulator between it and your battery or battery bank. I have a 30 watt panel with a little regulator going to a set of 5 of these 35AH batteries. The panel is 20V, the regulator allows that to charge the batteries until they get up to something like 14.2 volts, then cuts off. Keeps the batteries nice and topped off and active for when we need them. I will eventually add more panels in parallel with the current one for faster charging. Here is a link to the regulator I am using: http://www.amazon.com/Sunforce-7-Amp-Charge-Controller/dp/B0006JO0XI/ref=sr_1_2?ie=UTF8&qid=1384291827&sr=8-2&keywords=solar+regulator This is the panel I am using: http://www.amazon.com/Instapark%C2%AE-Black-Mono-crystalline-Solar-Panel/dp/B004FWW44Y/ref=pd_sim_auto_2
2232963
Amps=watts/volts. So 250w/24v=10.4 amps. This is considering full output of the solar panel and no loss through cabling. So to be safe you can run three solar panels More than likely you can get away with four, as you will likely never see a full 10 amps output.
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.
1123837
A test you can make is to directly connect the panel to the battery, correct polarity important or you will fry things. If the voltage is 17 volts or under you are good to go. If it is still over 18 volts you will be over current and ruin the battery. You cannot have the controller set to 24 volts for your 12volt battery!
765121
As the electrical engineer answered, his keeps three batteries charged. he also mentioned he doesn't use a controller. Since this panel is very efficient it might be best not to leave it charging a single battery long term without a controller. If you weigh the cost of controller($15?) against battery, what would be your choice? This solar panel seems like it will last a long time so you might consider the controller. Most are good up to 95 watts if you decide to add to your panels.
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.
1872882
You can hook them up together in PARALLEL, so that the total voltage output is still 12 volts. I would wonder why you would want to? Remember that solar panels are primarily used to keep batteries charged and this panel, at max output will provide you with 12 volts at 10 amps, plenty to charge or keep a battery charged. I would spend my money and buy a bigger battery or several batteries you can hook together in parallel.
1411592
Hello,If you are charging 12v nominal battery bank you can input up to 400 watts of solar power.If you are charging 24v nominal battery bank you can input up to 800 watts of solar power.The wiring configuration of the 800 watt panel setup must be done so that you do not parallel all of them or not series all of them or else the panels will either go out of the 100 VDC or the 40A rating.The 800 watt setup must be wiring in series/parallel.Please let us now if you have any further questions.Regards,AW
852803
ohm's law says 8.333333 etc. But most 12 volt solar panels are actually operating at a higher voltage than 12 because of the need to charge a 12v system you need a higher voltage my charge controller doesn't really start till 14.4, I'm going with the average 5.0-5.5 weather, wiring distance, number of connections can change the number. since my smaller charge controller is 30 amp. I would stay at 5 panels max. with a hefty diverter load. and if you have multiple panels how you wire them(parallel or in series) can be a big difference too.