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Home Brew Forums > Home Brewing Beer > Electric Brewing > 50A Kill-a-Watt?
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Old 07-08-2012, 12:30 PM   #1
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Default 50A Kill-a-Watt?

Does anybody know of a similar product (or implementable method) for measuring total kWh used over the course of a brew session, on a 50A/220V system? I need a way to accurately measure the cost of my brew sessions.

Mathematically estimating it isn't sufficient for me because of uncertainty due to cycling (especially during the mash where it can't just be set to a certain percentage), among other reasons. You may disagree, but regardless, that's not what I'm looking for.

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Old 07-08-2012, 12:57 PM   #2
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what about running it thru an actual power meter, kinda like that one on the houses main power inlet. Kinda like this

http://mollelec.en.alibaba.com/produ...KWH_METER.html

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Old 07-08-2012, 08:36 PM   #3
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Default there are a bunch posted on eBay.

http://myworld.ebay.com/kwhmeters*co...id=p4340.l2559
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Old 07-09-2012, 04:33 AM   #4
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Just shut off everything in your house. Read the meter before and after the brew. Pretty simple and free.

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Old 07-18-2012, 01:53 PM   #5
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Shut off (and unplug) right?

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Old 07-18-2012, 01:57 PM   #6
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Shut off (and unplug) right?
The only items you would have to consider would be the A/C in the house and the fridge. Residual power consumption from "phantom" power sources would most likely not amount to much more than a penny or two over the course of a brewing session.
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Old 07-18-2012, 02:15 PM   #7
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Quote:
Originally Posted by emjay View Post
Does anybody know of a similar product (or implementable method) for measuring total kWh used over the course of a brew session, on a 50A/220V system? I need a way to accurately measure the cost of my brew sessions.

Mathematically estimating it isn't sufficient for me because of uncertainty due to cycling (especially during the mash where it can't just be set to a certain percentage), among other reasons. You may disagree, but regardless, that's not what I'm looking for.
Check your local library, I borrowed one from there a few months back and was amazed to find out the fridge that was making a lot of noise starting up, was actually costing my $50 a month due to high current draw.
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Old 07-18-2012, 02:16 PM   #8
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You could probably use 2 killawatts, one on each leg of the 240VAC. You'd have to wire up an inline box with a couple of plugs in it, but I think it would work. I might give it a test myself. I've got a killawatt (Home Depot sells them for about $20).

You could just measure 1 leg and double the Amps you read, but if you have any 120V devices you'll measure wrong.

I"m assuming you are talking about a 240V split phase power (U.S.) and not the single phase 220V used in Europe.

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Old 07-18-2012, 02:35 PM   #9
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Quote:
Originally Posted by pb4ugoout View Post
The only items you would have to consider would be the A/C in the house and the fridge. Residual power consumption from "phantom" power sources would most likely not amount to much more than a penny or two over the course of a brewing session.
You're forgetting about electric water heater, pump (if on well water) and whatnot. I also disagree about phantom power being trivial. Even with everything off, my entertainment center (plasma tv, cable box, AV receiver, BluRay, sub) draws about half an amp. If the OP wouldn't be satisfied with calculated estimates, then these other variables would likely also be a problem.
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Old 07-18-2012, 06:54 PM   #10
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10 charac

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