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Car Forum / Driving, Maintenance, Tuning / RVs / November 2005Is there a formula for Inverter output voltage , to actual ?
With a modified sine type of Inverter like the compact kind that you can get at Menards for approx. $79, it puts out a voltage of about 90 volts. Is there a formula for this that tells you what the 'actual' voltage is at the product youre powering ? IE : Does 90 Inverter output volts, equal 120 v. ? Thanks. > With a modified sine type of Inverter like the compact kind that you can > get at Menards for approx. $79, it puts out a voltage of about 90 [quoted text clipped - 3 lines] > > Thanks. Good question as I have never put a volt meter on on. Regular wall current is sinewave and the typical metter reads the average voltage, not the peak to peak and there are time in the cycle than voltage is a lot less than 120. What I am trying to say is tat your meter may be having trouble with the inverters modified square wave output. If a device works properly attached to it, do not give it another though. I have nbeen using some for manys years now and never metered the first one and now you have got me curious. Alsoyou want to manitain good supply voltage to it because output will drop if input voltage drops much.  Signature----------------- www.thesnoman.com > With a modified sine type of Inverter like the compact kind that you can > get at Menards for approx. $79, it puts out a voltage of about 90 > volts. Is there a formula for this that tells you what the 'actual' > voltage is at the product youre powering ? IE : Does 90 Inverter > output volts, equal 120 v. ? From where did you get your 90 Volt value? SignatureD.J., N8DO; FMCA 147762 dj[underscore]osborn at yahoo dot com Measure this with a True RMS volt meter ... because of the modified sine wave a regular averaging volt meter may be fooled & show you a lower voltage. JJS > With a modified sine type of Inverter like the compact kind that you can > get at Menards for approx. $79, it puts out a voltage of about 90 [quoted text clipped - 3 lines] > > Thanks. > Measure this with a True RMS volt meter ... because of the modified sine > wave a regular averaging volt meter may be fooled & show you a lower [quoted text clipped - 8 lines] >> output volts, equal 120 v. ? >> Thanks. Just for the heck of it I measure one of my inverters after reading this and it was 120.2 volts but it was with a high dollar fluke DVM too. Signature----------------- www.thesnoman.com I measured the output of my 700 w. Inverter with a $150 meter and i get 90 volts . Incoming to the Inverter is 12.9 vdc. > I measured the output of my 700 w. Inverter with a $150 meter and i get > 90 volts . Incoming to the Inverter is 12.9 vdc. I do not think the inverter is bad, your DVM does not know how to read it properly. A old analog meter would work better I think because wave shape will have little effect on it. Signature----------------- www.thesnoman.com Dave, Line voltage in most communities is about 120 volts alternating current. The waveform is supposed to be a sine wave, and if measured on an oscilloscope would measure a peak-to-peak value of 336 volts. (120 volts x 2.8 PEP conversion factor) The 120 vac number is a RMS value (root mean square) and will deliver the same power as 120 vdc (Volts Direct Current). Because an AC voltmeter is designed to measure RMS voltage, it will not give an accurate reading on the output of a square wave inverter. The easiest way to check the output of an inverter is to load it to about half it's rating, and compare the brightness of an incandescent bulb when operating from the inverter as opposed to operating off "shore" power. Good luck! > With a modified sine type of Inverter like the compact kind that you can > get at Menards for approx. $79, it puts out a voltage of about 90 [quoted text clipped - 3 lines] > > Thanks. He's back. Watch your kids. > With a modified sine type of Inverter like the compact kind that you can > get at Menards for approx. $79, it puts out a voltage of about 90 [quoted text clipped - 3 lines] > > Thanks. Not to mention pets, farm animals and used sex toys.......www.davesdildos.com |
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