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01-01-2005, 05:12 PM | #21 | |
SiaoGu Gives You Wings
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If the pump does not come with the specs .. you may take it to have a power factor of 0.7 or lower. Its better to overdesign than underdesign. 10% power loss is reasonable for a good inverter .. again depending on the quality of it. May range from 10% to 30% |
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01-01-2005, 10:11 PM | #22 | |
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03-01-2005, 05:03 PM | #23 | ||
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Bro,
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03-01-2005, 05:53 PM | #24 | |
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Higher because of the reactive power. |
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03-01-2005, 11:44 PM | #25 | |
SiaoGu Gives You Wings
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I took a actual measurement of my resun MD55, its abt ~0.9A which is higher than the rated 0.8A. So 0.9A X 240V = 216VA Assuming the rated wattage is correct 130watts/216VA = powerfactor = 0.6 |
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04-01-2005, 06:35 PM | #26 |
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That's not very efficient, is it?
I think not many people (like me) realize this. And think that 1 VA = 1 W. To certain extent, the specs on the label is a case of misrepresentation. As far as power consumption is concerned, we're only paying for the 130W and not the 216VA, right? |
04-01-2005, 07:15 PM | #27 | |
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Now .. resun MD55 is rated at 130W but at what load? Max load? Min load? My guess is that the resun MD55 is rated at the max load/min wattage while iwaki is rated at min load/max wattage. Taken from a post from Roidan in SRC The power consumption of the pump increases when the flowrate is higher! Roidan measured a 0.95A for his MX100 while I got ~0.9A for my resun MD55? Fishy isnt it? If I based on the rated 130watts and calculate the monthly kWh costs, it doesnt tally with the actual increased in electricity bills! So now, we realised that using a pressure rated pump for non-pressure rated application isnt really a good thing. You got less flow per hr and get higher electrical bills! |
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06-01-2005, 12:51 AM | #28 |
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Ah so!!!! No wonder my electricity bill estimates never seem to tally with the real thing. Damn !!!
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06-01-2005, 07:16 PM | #29 |
SiaoGu Gives You Wings
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Renaming this thread to UPS and power consumption
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07-01-2005, 12:15 AM | #30 |
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ah! time to get rid of my md55! but how about my beckett? alamak!
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