How to calculate the change in watts if input voltage is changed?

[SPIKER]

You will probably be completely fine with those numbers, a little high is actually better than low voltage. Most electronics actually rectify the voltage into DC and use that out of a regulated DC power supply.

If you take a look at that regulator on the generator there should be a trim pot on there that will adjust the output voltage some too...

In most cases line systems (grid) is +/- 5v and is normally classified as 115vac (110v ~ 120v)

On the 230v it can be +/- 10 volts (220~240) but there is the 3phase systems that will run in that 208 high leg, which is actually 208V to Neutral while running closer to 220 leg to leg.


Mark

 

[90cummins]

I did some searching pertaining to the high output voltage I measured which was 250v loaded 260v no load and have a question.
First this generator is made by DEKA and is brushless and capacitor regulated.
The currently installed (original capacitor???) is rated at 50UF+/-6% 370 VOLTS AT 50/60 HZ
The current replacement capacitor is the following which I cut & pasted.
The 27007004S Capacitor was used on the line of generators produced by Desa International and sold under several different names.
The 27007004S Capacitor is a 70UF, 440 Volt capacitor.

This 27007004S Capacitor is the current replacement capacitor for the older style ceramic housing capacitor that was originally used by Desa for it's line of Portable Generators that were privated labeled for Dayton, Sears Craftsman, Grainger, Master, Pincor and Reddy generators.

The following specifications can be used for the new 27007004S Capacitor. Capacitance Range: 70 F
Capacitance Tolerance: plus or minus;3%
Capacitance Variation with Temperature.
Rated Voltage:440 Volts 50/60Hz RMS voltage for a sinusoidal waveform.
I tell my friend about the new capacitor with the different rating and he said that installing this new 70uf 440v capacitor will cause the voltage to increase further not decrease.
The trouble shooting tree does not mention a high voltage symptom both loaded & unloaded.
Is he right or wrong in stating that this new capacitor will increase the voltage further?
I need expert advice!!
Thanks
90cummins

 

[buickanddeere]

For the algebraically challenged, like me :laughing:, we were taught the old finger on the circle trick:

E
-------
I R

I = E/R
R = E/I
E = IxR

I wonder if the power factor varies enough between the various generators to make a significant difference?

P= V x A x P.F.

 

[Larry Caldwell]

I measured the voltage across the 2 hot leads and have 260v no load and 250v loaded.
The Yanmar manual specifies no load voltage of 132v max/ 265v max.
The operating range for 120v is 122+-3
The operating range for 240v is 244+-6
According to the manual I'm good to go.
What do you think??
What damage can high voltage do to home electronics?
Hertz ranged from 61.3 no load to 60.3 loaded.
Thanks

90cummins

Most modern home electronics are manufactured for a world market where standard voltage varies from 50v to 220v. The only thing they change is the cord. You can ignore any voltage fluctuations. The power supply is a solid state tanking circuit that actually works better on a square wave, so anything you feed it will be fine.

Older appliances may not fare as well.

 

[Larry Caldwell]

Power equals voltage squared divided by resistance.

If resistance doesn't change, going from 208 to 220 power increases by 11.8%. Going from 208 to 240 power increases by 33.1%.

Power equals current squared times resistance.

 

[Midniteoyl]

Power equals current squared times resistance.

Or volt squared / resistance...

Or volt x current..