Kilowatts vs watt hours

[Bikerscum]

I see on Solaredge public monitoring sites the output is shown in kw. On Enphase sites it's shown as watt hours. How can instantaneous production be measured in hours? How many kw is 1 watt hour?

Thanks, confused.

[Sunking]

I see on Solaredge public monitoring sites the output is shown in kw. On Enphase sites it's shown as watt hours. How can instantaneous production be measured in hours? How many kw is 1 watt hour?

Thanks, confused.

Watts is the rate power is being used, and watt hours is how much energy is used over a specified time. The formula for watt hours takes 16 years of advance education in math Phd studies in the USA, 5th grade math anywhere else.

Watt Hours = watts x hours.

100 watt light bulb one of 10 hours is 100 watts x 10 hours = 1000 watt hours or 1 Kwh or 10 cents.

[Bikerscum]

Watts is the rate power is being used, and watt hours is how much energy is used over a specified time. The formula for watt hours takes 16 years of advance education in math Phd studies in the USA, 5th grade math anywhere else.

Watt Hours = watts x hours.

100 watt light bulb one of 10 hours is 100 watts x 10 hours = 1000 watt hours or 1 Kwh or 10 cents.

I grasp the complex math lol.

Here's my question better stated...

When I look at a Solaredge monitoring site, I can see the exact kw output at any given time of day. How on this Enphase site Enphase monitoring would you see the exact kw output at say 3:30pm?

[foo1bar]

I grasp the complex math lol.

Here's my question better stated...

When I look at a Solaredge monitoring site, I can see the exact kw output at any given time of day. How on this Enphase site Enphase monitoring would you see the exact kw output at say 3:30pm?

From 3:30 to 3:45 they generated .704kwh (704watt-hours)
.704kwh/.25hour = 2.816kW average power during those 15 minutes. (probably a little higher at 3:30, and lower at 3:45)

[Bikerscum]

From 3:30 to 3:45 they generated .704kwh (704watt-hours)
.704kwh/.25hour = 2.816kW average power during those 15 minutes. (probably a little higher at 3:30, and lower at 3:45)

THAT's the piece of the puzzle I was missing.... thanks!

[inetdog]

I grasp the complex math lol.

Here's my question better stated...

When I look at a Solaredge monitoring site, I can see the exact kw output at any given time of day. How on this Enphase site Enphase monitoring would you see the exact kw output at say 3:30pm?

On the Solaredge monitoring site they may graph the kW output as a function of time of day, but I am sure that what they are actually posting is the average kW over the time between measurements, whatever that might be. Otherwise the kW value could be varying rapidly over time and the value plotted could also very widely depending on just what time within each plotting interval the chose to make the measurement.

[Bikerscum]

On the Solaredge monitoring site they may graph the kW output as a function of time of day, but I am sure that what they are actually posting is the average kW over the time between measurements, whatever that might be. Otherwise the kW value could be varying rapidly over time and the value plotted could also very widely depending on just what time within each plotting interval the chose to make the measurement.

It's also 15 minute intervals, but the graph is power not time. If you go here for example... Solaredge monitoring and click on the green graph bar for Sept you'll see a curve for the day, showing spikes and all. I find that more useful.

Others I'm sure feel the opposite.

[inetdog]

It's also 15 minute intervals, but the graph is power not time. If you go here for example... Solaredge monitoring and click on the green graph bar for Sept you'll see a curve for the day, showing spikes and all. I find that more useful.

Others I'm sure feel the opposite.

I think that you mean power, not energy. And I am pretty sure that what Solaredge plots is the average power over that 1 minute interval.

From that you can derive a graph of total energy production over time, just not without some number crunching.
And from the graph of energy production over time you can calculate the average power for each interval.
For different purposes, different kinds of graph are most appropriate and most comfortable to read.

[SunEagle]

Watts is the rate power is being used, and watt hours is how much energy is used over a specified time. The formula for watt hours takes 16 years of advance education in math Phd studies in the USA, 5th grade math anywhere else.

Watt Hours = watts x hours.

100 watt light bulb one of 10 hours is 100 watts x 10 hours = 1000 watt hours or 1 Kwh or 10 cents.

That 1 kWh costs me about 12 cents.