Author Topic: Correct PF capacitor value for 45/60W LPS lamps..?  (Read 577 times)
MissRiaElaine
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Correct PF capacitor value for 45/60W LPS lamps..? « on: November 05, 2017, 01:31:13 PM » Author: MissRiaElaine
Hi all,

What value PF capacitor should I be using with a Philips L4045 leak transformer ballast and a 45/60W SO/H or SOI/H lamp..?

The table I have quotes 20F for 35/55W SOX lamps on a choke/ignitor ballast system, would this be ok..? I've seen other values suggested so I'm a little confused (not a difficult task..!)

Ria
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Ash
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #1 on: November 05, 2017, 01:54:03 PM » Author: Ash
Calculate yourself



Are the line Amps stated on the ballast ?

I = line Amps

V = line Volts

Plamp = lamp power (W)

Ploss = estimated ballast losses (guess ~10..15W for old 60W autoleak)



S = V I

P = Plamp + Ploss

Q = sqrt ( S^2 - P^2 )

X = V^2 / Q

C = 1 / ( 2pi f X ) [ Farads ]
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Lodge
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #2 on: November 05, 2017, 02:05:10 PM » Author: Lodge
Philips C 12022/25 which is 13 uF
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #3 on: November 05, 2017, 02:24:25 PM » Author: Lodge
Or you could use this online calculator http://www.rapidtables.com/calc/electric/power-factor-calculator.htm but do you actually pay a demand charge/power factor surcharge because of a low power factor ? as it will not affect the power bill at the end of the month for most home users who only pay for real power not apparent power... 
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MissRiaElaine
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #4 on: November 05, 2017, 02:36:47 PM » Author: MissRiaElaine
Or you could use this online calculator http://www.rapidtables.com/calc/electric/power-factor-calculator.htm but do you actually pay a demand charge/power factor surcharge because of a low power factor ? as it will not affect the power bill at the end of the month for most home users who only pay for real power not apparent power... 

As I've said before, I want a display to be correct, so while I do want to pay as little as possible, I also want the correct capacitor value as would have been used when the ballast and lamp were in service.
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Lodge
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #5 on: November 05, 2017, 03:03:17 PM » Author: Lodge
Ok I did a little more digging, the correct cap is a Philips L4016/07 for that ballast which is actually a 16uf and it's also used on there L4154 250 watt SON gear and the L5250BX mercury gear and the L4700BX will use two of them and the L5400 will use two of them so getting the actual replacement should not be that hard as it's a pretty common size cap, And I hear you it does look better to have a complete setup, but sometime I have short term memory issues Roll Eyes..
« Last Edit: November 05, 2017, 03:07:37 PM by Lodge » Logged
MissRiaElaine
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #6 on: November 05, 2017, 03:20:50 PM » Author: MissRiaElaine
Thanks for that, as I said for 35/55W SOX lamps, several manufacturers quote 20F, also I'm not sure if this has any impact on calculations, our mains voltage here is somewhat higher than the UK norm at 245V. I suspect that this is because the sub-station is right outside our kitchen window..!!

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MissRiaElaine
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #7 on: November 06, 2017, 10:44:25 AM » Author: MissRiaElaine
Thanks to all for their advice, I have found the answer thanks to an email from James. The correct value is 15 or 18F, depending on lamp, as specified in the 1966 catalogue here  Smiley
« Last Edit: November 06, 2017, 10:47:17 AM by MissRiaElaine » Logged

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MissRiaElaine
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Re: Correct PF capacitor value for 45/60W LPS lamps..? « Reply #8 on: November 06, 2017, 11:00:34 AM » Author: MissRiaElaine
Thanks to all for their advice, I have found the answer thanks to an email from James. The correct value is 15 or 18F, depending on lamp, as specified in the 1966 catalogue here  Smiley

A slight correction; looking at these figures, they seem to be for SOX or SOI/H lamps, going back to 1962 the figures are 13F for a 60W SO/H but 15F for a 45W one, amazing what a few years can do Grin
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