If you have a coffee pot that uses 1000 watts and you leave it on for one hour, it uses 1 kwh, right?

Question

How many watts would a solar panel have to be rated for if the panel 'ran' at full for 10 hours a day in order to power the coffee pot that was left one for 5 hours a day?

Answer 1

correct.

You want a solar panel to develop 5 kW-hr of energy (1000 watts x 5 hours) correct?

And you want to do this in 10 hours.

5 kW-hr / 10 hours = 500 watts.

so you need a 500 watt solar panel.

In an ideal world.

In real life, you would be lucky if a 1000 watt solar panel developed 5 kW-hr in 10 hours. Output falls off a lot if the sun is not exactly perpendicular to the panel, which it is for only a few hours a day. Any shade on the panel can also reduce it's output a lot. Plus there are losses in batteries, battery chargers, inverters, etc.

.

Answer 2

You didn't say "rated for 1000 watts", you said "uses 1000 watts". Anyway, ignoring the example you gave, 1000 watts for one hour is

1 KWh.

Actually your whole question sounds theoretical, since you specify that the solar panel runs at full capacity for 10 hours and this is impossible.

The biggest problem with your question, theoretical or not, is that you can't run a load at 1000 W off of a source that only supplies 500 W.



You'd have to have a battery to store the 5 hours of solar panel output before the load started running for 5 hours, and then having the panel and battery together supplying the load.

Answer 3

Coffee pots have two circuits - one for brewing and one for keeping the coffee hot.  It's the brewing cycle that needs the full 1000 watts - to actually heat and boil the water.  The heating cycle would use less than 1000 watts.

Answer 4

Not necessarily- True, a device that uses 1000 watts for 1 hour uses

1kwh : however,a coffeepot has a thermostic switch that turns the power off when the design temperature is reached ,and then cycles the power on and off to mantain the correct temperature ,resulting in a use of less than 1 kwn in an hour of use.

Answer 5

that is correct, a kilowatt is a thousand watts

Answer 6

First   Not right.

That 1000 W. is the elements capacity.

Once the thermostat is satisfied, the coffee pot will shut it down.

When you turn it on it heats the water to a set temperature, then it

"throttles" the heater to maintain that temp., otherwise it would boil

all the coffee away.

Second, a typical large solar panel produces about 15W. only when it gets clear sunlight directly at it.

Most of the day it produces somewhat less.

Figure it will produce about 10W. average over the six hours of most direct sunlight for about 60-80 Watt hours per panel per day of good sun.

You can do the math from there.

Answer 7

that is not correct. Just cause it says it uses up to 1000 watts does not mean that it is at maximum capacity through out the time frame of one hour.