Help on making a DC wattmeter.

[Sunny55]

Hi, can anyone provide me the circuit for a DC watt meter please ? The DC watt meter is going to measure power ranging from 100W - 200W.

Thanks.

 

[emresel]

Hi;
Power is Vrms x Irms, since rms of a DC voltage source is the voltage itself (ie 5V DC source rms value is 5V again), you just need to measure Irms and then multiply it with the voltage rating of DC soure.
So instead of a full wattmeter you just need a current meter in this case. It may simplify your job.

 

[goldsmith]

Hi, can anyone provide me the circuit for a DC watt meter please ? The DC watt meter is going to measure power ranging from 100W - 200W.

Thanks.

Hi Sunny55 !
With an MCU you can design it ! or even with a simple 7107 . you should measure voltage and then voltage across a current sensor resistor and then doing a simple multiplying ! then showing it on an LCD .
Best Wishes + Merry Christmas
Goldsmith