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Old 12-27-2010, 12:13 PM   #1 (permalink)
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Default How much current does a charger use?

My landlord just reported a doubling (from $200 to $400) of the monthly electric bill! Nothing has changed except for the grid charger. I plug it in almost every night but that doesn't seem right. I thought it used about as much as a 500w PS computer.
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Old 12-27-2010, 12:43 PM   #2 (permalink)
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Originally Posted by Geodesiq View Post
My landlord just reported a doubling (from $200 to $400) of the monthly electric bill! Nothing has changed except for the grid charger. I plug it in almost every night but that doesn't seem right. I thought it used about as much as a 500w PS computer.
This is ideal for a fully electric... pass on your driving costs to the landlord. hahaha
http://www.amazon.com/P3-Internation...3471586&sr=8-1
The KillAWatt claims to be able to measure up to 1875VA. Does your charger use more than that? If not, get one and see for yourself exactly how much you use. I would but I own a 2nd gen. Insight.


BTW, at least one thing has changed: the weather.

Last edited by MPBK; 12-27-2010 at 05:05 PM.
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Old 12-27-2010, 02:03 PM   #3 (permalink)
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Quote:
Originally Posted by Geodesiq View Post
My landlord just reported a doubling (from $200 to $400) of the monthly electric bill! Nothing has changed except for the grid charger. I plug it in almost every night but that doesn't seem right. I thought it used about as much as a 500w PS computer.
Your question is leaving a few things out of the equation.

What type of grid charger do you have?

How much current does it put into the battery when charging?

How long do you leave it on? Overnight? Days at a time?

Does it auto-shut-off?

Jim.
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Old 12-27-2010, 05:01 PM   #4 (permalink)
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Less than 600 - 700 w/h per charge, or roughly 4 - 6 cents of electricity a night for a single battery pack.

I figure I pay roughly $30 a year to charge two battery packs about 5 days a week.

A kill-a-watt meter should show about 70 watts until the battery is charged. That is for the charger designs that have been used and sold by people on this site and applies to a single battery pack.
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Old 12-27-2010, 05:04 PM   #5 (permalink)
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Default Grid charger watts

Charging the pack: 170Volts x 0.350 Amps equals 65 Watts, so you are looking at less than 100 watts, ie a tungsten filament lightbulb.

You could buy a plug in power meter for a a very modest sum of money, plugs into the wall socket displays Volts current watts etc, that would show you and your landlord how much you are really using for the car
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Old 12-27-2010, 05:28 PM   #6 (permalink)
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Thanks for the info. I just wanted a ballpark figure. No way it could be $200./mo. I'll get that KillaWatt thingy. Sounds useful.
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Old 01-02-2011, 09:35 AM   #7 (permalink)
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Dont forget that the supplies are not 100% efficient.

A look at the data sheets indicates:

lpc-20-350 draws a max of 550ma@120vac
http://www.meanwell.com/search/lpc-20/lpc-20-spec.pdf

RS-15-12 draws a max of 350ma@120vac
http://www.meanwell.com/search/rs-15/rs-15-spec.pdf

the 3 rs-25-48 draw max of 700ma each or 2100ma
http://www.meanwell.com/search/rs-25/rs-25-spec.pdf

total ~3A @ 120vac, or about 300W max.

The RS-25-48 supplies will draw less than their max. since the 350maCC is limiting the current to that value, so we are probably somewhere in the 190-250W range. Buy a Killawatt and measure the watts directly so you can show the landlord.

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Old 01-02-2011, 11:24 AM   #8 (permalink)
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Quote:
Originally Posted by Mike Dabrowski 2000 View Post

The RS-25-48 supplies will draw less than their max. since the 350maCC is limiting the current to that value, so we are probably somewhere in the 190-250W range. Buy a Killawatt and measure the watts directly so you can show the landlord.
The values I quoted are at the kill-a-watt.
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Old 01-02-2011, 02:26 PM   #9 (permalink)
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With a KaW on the input circuit and an ammeter on the output, I measured my charger at 84% efficient.
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Old 01-03-2011, 10:41 AM   #10 (permalink)
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Wow.... When I used an electric wheelchair that used 2 group 24 batteries to get around it effected my power bill less than 5 bucks a month. Leaving my computer on or a second refigerator was more like 10. I have Dominion power and they pro rate the service charge withthe watts used, so even if the power is so many cents a kilo, you got to factor in their service charge too.

I bet its someone stealing power when you are not looking.
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