Power Factor Correction

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Power Factor Correction

Postby Ray » Mon May 15, 2017 8:17 pm

I have an old forklift charger that i use with a generator to charge the house batteries when the solar runs short. This has worked well i know not the most effeciant way to do things but it is working for now untill i can make a DC Generator.

Well i just got a 3KVA Inverter generator (Very quiet) couse the neighbous where complaing about my 3 litre lister Diesel being to noisy. In trying to understand things better and not kill the new generator i found that the KVA output and the actual output where much different and learned what a power factor problem means as i was at 0.75PF

Well after much looking on the web and struggling to get my head around the maths it seems that a 42uF Capacitor is the fix and so far couse i only had a 30uF i have wired it accross the active and nuetral of the charger and now i am at 0.85PF so it would seem that it works.

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Re: Power Factor Correction

Postby Gordon-Loomberah » Mon May 15, 2017 8:55 pm

Did your output voltage go up much when you added the cap?
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Re: Power Factor Correction

Postby davidg » Sat May 20, 2017 11:02 am

Dont try and get it to pf 1.0 a pf 0.9 lagging is a good target you dont want to have a situation of the pf fluctuating between lagging and leading generators really don't like that.

Then ensure the generator is under no more than 80% load allowing for power factor, most generators are rated in KVA which is typically an instant peak value they can't sustain it.
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Re: Power Factor Correction

Postby Ray » Sat May 20, 2017 6:57 pm

Gordon the voltage and current stay the same but because the current is lagging the effective wattage is different please correct me if i am wrong David.

Thanks David for clarifying i was wondering why we are not trying for a PF of 1.0

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Re: Power Factor Correction

Postby davidg » Sat May 20, 2017 7:33 pm

Here's a pretty good description of what occurs, when, how and why.
https://en.wikipedia.org/wiki/Leading_a ... ng_current
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