Pages: [1]   Go Down
Author Topic: Approaches to measuring power consumption  (Read 756 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Full Member
***
Karma: 0
Posts: 145
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I'm trying to build an arduino based power meter for a home.

Based on the research I've done, (mostly googling  smiley-wink ) I've seen that many designs use inductive current sensors. These are basically loops of wire that are placed around the wire carrying the current.

I would like to know if there are any other approaches to measuring current and which one is the best.
Having a low cost is a priority.
Logged

Offline Offline
Sr. Member
****
Karma: 0
Posts: 403
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I have seen some people hack into those kill-a-watt devices
http://www.altestore.com/store/Meters-Communications-Site-Analysis/Meters-Battery-Monitors/Power-Meters/Kill-A-Watt-Electricity-Usage-Monitor-P4400/p932/?gclid=CML8lcqFpLgCFSRp7AodkWEAuA
Logged

Australia
Offline Offline
Sr. Member
****
Karma: 9
Posts: 412
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

How accurate do you want the power measurements to be.
Inductive pickup clamp type devices arnt very accurate as they dont know anything
about phase angle, so cant tell the differance between watts and VA, and they only work with
sinusoidal current waveforms, so will be inaccurate with loads with switchmode power supplies.
The only accurate way to measure power consumption, is to both measure the voltage and current
and compute the RMS value of both to obtain the power.
There are dedicated ICs available that do all you need, like this.
http://www.maximintegrated.com/datasheet/index.mvp/id/7080
Logged

Pages: [1]   Go Up
Jump to: