For an average 8 hour sunlight day, it would take 5 to 8 hours to charge a 12 V battery with a 100 watts solar panel. But there are different factors such as weather or battery size that may vary the total time.
How Long to Charge 12V Battery With 100-Watt Solar Panel
Whenever you think of free energy, solar power will come to your mind. With fossil fuel being scarce & expensive, it’s high time we shift to a new form of energy. What more significant than an utterly green energy form.
We know you’re already tired of hearing all the go-green slogans. You’re here for the information that can meet your energy needs. So if you are planning to charge a 12-volt battery with a 100-watt solar panel, it would take around 5 to 8 hours.
How it gets the light
This depends on some variables, such as the weather or the size of the battery. If the panel doesn’t get direct sunlight, it might increase the time. You must ensure there are no obstacles such as trees or shadows between the sunlight & solar panels. A cloudy day might increase the charging time too.
Size and Output
The charging time also varies on solar panel size & amp output. A large solar panel can charge your battery much faster than a smaller panel. A 100-watt solar panel that can generate 1 amp of current will take around 5 to 8 hours to charge a 12 V battery.
Is It Okay To Directly Connect the Battery With the Solar Panel?
If you want to destroy your battery, then why not? You never plug the cable of the solar panel directly with the battery. If your battery is a 12V battery, then it is meant to take around 12 volts. 12 volts is a safe place for your battery.
But the solar panel would create around 13 volts. This range will climb at a rapid pace. There are electrolytes inside your battery that will start bubbling. For those who are not chemistry nerds, this is very dangerous for your battery. Eventually, this will destroy your battery in no time.
How To Properly Get Started With the Whole Process?
Fortunately, this is not rocket science at all. It’s a straightforward process that involves a solar charge controller to regulate the voltage between. This helps control the voltage so that it doesn’t cross the safety limits.
You just have to connect the controller with one end with the battery & the other end with the solar panel. You are ready to charge up your battery with no fear of damage.
What Is the Size of the Solar Panel To Charge a 12 Volt Battery?
The standard size would measure around 65 x 39 inches. There are different sizes available in the market. But with this standard size, you will have a full charge in 5 to 8 hours. The larger the solar panel, the faster it can charge the battery.
How Many Solar Panels Do I Need To Charge a 100ah Battery?
There are depletion limits for a battery. That’s why you wouldn’t get 100% out of your battery. So for a 100ah battery, you would get around 85 amp hours of energy from it. Now we need to calculate the current by dividing the power in watts by the voltage in volts.
So to charge your battery in 12 volts & 20 amps, it would take around five hours to set 100 amp. So you would need a 240 watts large panel or use 3 100 watt solar panels to do the job.
What Can I Run With a 100 Watt Solar Panel?
A 100 watt solar would supply around 5 amps on a sunny day. This calculation is done on the assumption that we get ⅓ of the day sunlight. A 100-watt panel can effectively run a load of around 2 A continuously with no loss. We are assuming the battery in the discussion here is 100 A/h.
Now suppose you have a fridge that draws 3A and 2 LED lights that draw 0.25 A each. You would want to run the fridge 24 hours a day & the light for about 6 hours at night. So the fridge would draw around 3A x 24h = 72Ah current. The lights would draw 0.25A x 6h x 2 lights = 3Ah
So the electric appliances draw around a total of 75Ah per day. The panels can supply around 5A x 8h = 40 Ah each day. So the battery would be discharged at 75 – 40 Ah = 32 Ah each day.
So you could run them 100Ah/ 32 Ah = 3 days without any other form of charging.
Q: What is amp hour?
Ans: Amp-hour is a current rating that is widely used for electric appliances all around. This means that how much current is supplied from the battery over one hour. If you have a 100 Ah battery, it can transfer 100 amps for 1 hour or ten amps for 10 hours.
Q: How do I determine how many panels I need?
Ans: First, you need to list all the appliances you would be running on the panels. Then calculate how much energy you need to power all the devices for the whole day. Match the energy need to help design the best solar system for you.
Ans: Can I use solar panels in a darkened area?
Ans: A common myth is that solar panels don’t work in cloudy areas. But they do work & will produce 25% of the energy produced on a sunny day. If you live in a gray area, you have to take this in your calculations if you plan to build a solar power system.
Many factors come in if you ask how long to charge a 12 V battery with a 100-watt solar panel. You need to be familiar with the terms such as amp-hours, volts, watts, etc. You can only apply your knowledge to calculate the necessary time for different factors such as large size or weather.