Watt meter

Got one last week directly from geewiz. It works great.

Busy going through the whole house checking consumption. On a positive note my PC uses a lot less than what i thought but i have a 4ft fish tank that uses 250W for everything, every hour of every day. Realised its actually costing me a lot to keep it running.
 
sh3rIIf said:
Got one last week directly from geewiz. It works great.

Busy going through the whole house checking consumption. On a positive note my PC uses a lot less than what i thought but i have a 4ft fish tank that uses 250W for everything, every hour of every day. Realised its actually costing me a lot to keep it running.
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Thanks. Ye, I have a few things running 24/7 and I'm trying to find out what is using the most power as the electricity prices just seem to be going up.
 
sh3rIIf said:
Got one last week directly from geewiz. It works great.

Busy going through the whole house checking consumption. On a positive note my PC uses a lot less than what i thought but i have a 4ft fish tank that uses 250W for everything, every hour of every day. Realised its actually costing me a lot to keep it running.
Click to expand...
250W with or without the heater running? The thermostat surely isn't on all the time? Though I could see a 4ft using 250W without the heater on, if you've got multiple lights and serious filtration.
 
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P924 said:
But it can only measure apparent power.

And for that, you have to measure voltage and current separately and do the calculation yourself. The one in the OP is much better suited for the purpose in the OP.
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I doubt anything OP is measuring has a cos (phi) far from 0.95, and nothing on the watt meter's description says something about VA or VAh metering or logging ability. Also we know mains is 220-230V, so it's only one calculation OP needs to do. If OP really wants to he can measure the mains voltage too. I find that easier than having to go scratch behind fridges, unplug them, replug them, wait to reach steady state, unplug and replug again.

Sinbad said:
Can't run a clamp meter on a normal 2 or 3 core cable, it'll read zero. Only works on a single wire.
Click to expand...

AFAIK only the live wire should have a floating voltage, so only one D (EMF) to measure, no?
 
agentrfr said:
I doubt anything OP is measuring has a cos (phi) far from 0.95, and nothing on the watt meter's description says something about VA or VAh metering or logging ability. Also we know mains is 220-230V, so it's only one calculation OP needs to do. If OP really wants to he can measure the mains voltage too. I find that easier than having to go scratch behind fridges, unplug them, replug them, wait to reach steady state, unplug and replug again.



AFAIK only the live wire should have a floating voltage, so only one D (EMF) to measure, no?
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Regarding the pf of 0.95, you would be surprized... same for voltage.

And Sinbad is correct, the voltage does not have anything to do with a clamp measuring current. The magnetic field will sum to zero when current is flowing in both directions...
 
P924 said:
Regarding the pf of 0.95, you would be surprized... same for voltage.

And Sinbad is correct, the voltage does not have anything to do with a clamp measuring current. The magnetic field will sum to zero when current is flowing in both directions...
Click to expand...

Derp, you're right. Im confusing Lenz's and Faraday's laws again. Too early for me without my coffee apparently. My bad OP :p
 
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