Hi
I have got a Solar panel on my roof and I am measuring the voltage and current, I then work out watt and from that I want to work out Watt Hour by multiplying watt by time but when the the current or voltage decreases the watt hour also decreases instead of staying the same.
Could someone please help me out on this.
Since watts=VA, I think that is what you would expect. If you do that and want the same watt/hours, you have to wait longer.
Ferdinand:
HiI have got a Solar panel on my roof and I am measuring the voltage and current, I then work out watt and from that I want to work out Watt Hour by multiplying watt by time but when the the current or voltage decreases the watt hour also decreases instead of staying the same.
Could someone please help me out on this.
You are measuring the volts X current at an instance in time. You forgot to include a "time" function in your calculation. You may want to count the number of measurements you do in one second, add up the "watts" you have computed, and then divide by the number of measurements to give you the power for one second.
Add up the watt-seconds for 3600 seconds and you will have the watt-hours.
Paul
Thanks for the advise.