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You can charge it with ANY wattage 12 volt solar panel.
The wattage of the panel will determine How Many Hours of sunlight you'll need to charge the 12 volt battery, so the next piece of information you need to consider is: what are you going to use that 12v battery for, and how quickly do you need it charged up?
Here's the math-
To figure out how many hours it will take to charge the battery, first figure out the output of the solar panel by dividing it's WATTS by it's Volts, which will give you it's output in AMPS. So. .
a 15 watt panel DIVIDED by 12v = 1.25 amps
Next, read the Amp Hour rating on your 12v battery. If we use a 50 amp hour battery for this example. . .
DIVIDE 50 amp hours [required to fully charge the battery] by the 1.25 amp output of the solar panel = 40 hours of direct sunlight to charge the battery. Then add another 10% of time to his number, so figure 44 hours.
Some more examples:
5watt/12vpanel=.42amp and 50amp hr/.42amp=119 +10% = 131 hours of sun
30watt panel works out to 22hours. 50watt=13hrs 80watt=about 8 hrs.
Of course all of these times are based a 50amp hour 12v battery.
BTW, I'm no expert... i just found this equation online 5 mins ago because i was wondering the same thing myself. . Now could anyone tell me how figure out quickly my computer or light or whatever will drain that 12v battery??
[Answer final question from above]
To determine how quickly your battery will drain, let's assume that same 50AH battery. You wish to run 2-5W 12V lamps for about four hours each evening and use your small laptop for an hour which has a 50W draw at 18V, so about 80W at 12V. Your use will be 80W/12V=6.7AH + ((2*5W)/12V)*4 hours=3.2AH, or a total of about 10AH per evening. If you allow the battery to discharge to 50% before wanting to recharge it, you can run as described for about 3-3 1/2 evenings per week. If you concurrently have a 30W solar panel charging the battery for 4 hours per day, you will be keeping the battery fully charged it (you will be putting back 10AH per day). This allows for a couple of cloudy days.
Hope this answers your question. Remember, watts/volts=amps. Multiply each load by the number of hours you need it to run to get ampere-hours. Add all these results together to determine the total draw on the battery.
What else can I help you with?
Can you charge a battery with solar panel producing 245 watts?
You can't charge the battery with those 245 watts unless they are being 'pumped into' the battery at a higher voltage than the battery puts out. If you can exceed the voltage of the battery, that 245 watts will definitely charge a battery.
How many watts solar panel do you need to charge 12v battery?
To charge any battery the voltage of the input must be more than the battery's output.
How many watts solar panel need to charge 12volts 7ah battery?
1 watt will do the job.
Can you charge a battery with solar panel producing 80 watts?
You sure can! I charge a marine battery with a 75 watt panel and it goes from a fairly good discharged state to fully charged in about four days.
How much power would it take for a 20 watts solar panel to charge a 12v battery?
about 500watts/meters of irradiance
How much solar panel need to charge 12v 180 ah battery?
Well, isn't that a happy little question! To charge a 12V 180Ah battery, you'll need a solar panel with a wattage of around 180-200W. This should provide enough power to charge your battery efficiently. Just remember, it's all about finding the right balance between the size of your solar panel and the energy needs of your battery.
How long will it take a to charge a 200 amp hour battery with a 1000 watt output solar panel?
To charge a 200 amp-hour battery with a 1000-watt solar panel, you first need to convert the amp-hours to watt-hours. A 200 amp-hour battery at 12 volts has 2400 watt-hours (200 Ah × 12 V). If the solar panel operates at peak efficiency, it can produce about 1000 watts, which means it would take approximately 2.4 hours of peak sunlight to fully charge the battery (2400 watt-hours ÷ 1000 watts). However, considering factors like inefficiencies and varying sunlight, it may actually take longer in practice.
If you have a 123 Watt 7 amp solar panel working on charging a 12 volt 225 amp hour gel battery how long will it take the solar panel to charge the gel batter?
You need to provide many more details. So assuming that the panel voltage is reasonable, the panel is clean, it is sunny and the panel is pointed at the sun. Then it will take about 225/7 hours to charge the battery. About 300 hrs. But in fact charging is only about 85% efficient (charge at 14 V get energy out at 12V or so). This ups the charge time to maybe 350 hrs or so. Charging can be improved by inserting a MPPT charger between the battery and the panel. This bit of electronics decouples the battery voltage and the panel voltage allowing the panel to be operated at its' most efficient voltage. That might knock off 15% of charge time bringing you back to 300 sunny hours.
How many watts solar panel do you need to charge my 12v 100amp battery in 6 hours if you use 5.5amp a hour?
There is too much information there. Charging a 100 amp-hour battery fully would take 18 hours at 5.5 amps, or 6 hours at 16.67 amps. At 5.5 amps the power would be 12x5.5 or 66 watts, and this is the rating of the solar panel required. That would be about 0.4 of a square metre.
How many watts in a solar panel?
The power output of a solar panel is typically measured in watts peak (Wp) or kilowatts peak (kWp). For a typical residential solar panel, the power output can range from around 250 watts to 400 watts per panel. Commercial or utility-scale solar panels can have higher power outputs reaching up to 500 watts or more per panel.
How many watts are in one solar panel?
The power output of a solar panel is typically measured in watts (W). A common residential solar panel has a power output ranging from 250 to 400 watts. Commercial solar panels usually have higher power outputs, up to around 500 watts or more.
How many watts does solar make?
The amount of watts that a solar panel system can generate varies depending on factors such as the size of the system, efficiency of the panels, sunlight intensity, and weather conditions. On average, a residential solar panel system can generate between 250 to 400 watts per panel.
