About 200 Dollars
It depends on what you call small. 5 watt panels are about a square foot or smaller and cost $10-30. You can't do much with a 5 watt panel though. A 100 watt panel is about about half the size of a regular home door. You can generate enough power to recharge car batteries with one of these in a couple days. These cost $200-300 each.
The average solar panel cost about $3.00 a watt wholesale. It delivers about $0.0015 per day. The projected life is about 20 years if the weather is not too hot.
They cost about $3-$4 per watt. You can't measure it in kilowatt hours unless you know where the panel is.
The cheapest is about $1 per watt. So if you need 1000 watts it would be $1000 for equipment and installation.
4 Watt-hours
A few variables are involved like, does the solar panel have a charge controller, what condition the battery is before you start and how much sun is the solar panel receiving.
Solar panels are ridiculously expensive. A small 130 watt unit costs almost $600. To run your house on solar panels you are looking at thousands of dollars.
The amount of energy produced by a 225-watt solar panel in a day depends on factors such as sunlight intensity and duration. On average, a 225-watt solar panel can generate around 900 watt-hours (0.9 kWh) to 1,350 watt-hours (1.35 kWh) per day, assuming about 4-6 hours of peak sunlight exposure.
No, a 500 watt solar panel may not be able to run a 500 watt appliance continuously, as factors such as efficiency losses, battery storage, and variations in sunlight intensity can impact the ability of the solar panel to consistently provide 500 watts of power. It is recommended to use a larger solar panel or incorporate a battery storage system to ensure reliable power supply to the appliance.
When used in the context of solar power, "Wp" means watt-peak. This refers to the nominal power of a solar cell or a solar panel. Watt-peak, kilowatt-peak, and megawatt-peak are often used interchangeably. Price per Wp refers to the amount of power that a solar cell or panel generates under real-life conditions in relation to its cost
A 20 watt solar panel produces 20 watts of power/hour when it is in direct sunlight. However, this varies depending on the conditions. It won't produce at 100% in cloudy conditions. Let's say the 20 watt panel gets about 5 hours of good sunlight everyday between 10am and 3pm. This will produce .1 kWh or 100 watt hours. This means you can run a 100 watt bulb for one hour or two 50 watt bulbs for one hour.http://www.heatingandcoolingcompanies.org/
A 250 watt solar panel means that it has the capacity to produce up to 250 watts of power under ideal conditions, such as direct sunlight. This measurement indicates the panel's maximum power output, which can vary depending on factors like weather and shading.