Welcome to Laser Pointer Forums! If you are looking for a laser you may want to check out the Laser Company Top Sites List. The link will open in a new window for your convenience.

Colorful 2018, Colorful Laser Power Meter
 Laser Pointers Math/Electricity HELP!!!

LPF Laser Pointer Company Database (link opens new window)

04-19-2012, 11:58 PM #1
 Class 3B Laser Join Date: Dec 2008 Location: Riverside, California Posts: 4,011 Rep Power: 1444
chipdouglas
Class 3B Laser

Join Date: Dec 2008
Location: Riverside, California
Posts: 4,011
Rep Power: 1444
Math/Electricity HELP!!!

Hey Guys,

I am horrible at math and need help.

I am considering getting a 12vdc 50watt submersible pump. I need help figuring out how much it will cost to run 12 hours a day.

i will be converting 120vac from my home with a variac and a rectifier.

will this set up have significant electriciy bill savings over just using a 120vac 20watt pump???

It's ok for you to laugh at me lol

Michael.

__________________
IN A CONSTANT STATE OF PICNIC

I AM THE STATUS QUO

ARE YOU A NEW MEMBER, OR EVEN MORE, ARE YOU NEW TO ONLINE FORUMS... READ THIS
LASER POINTER FORUM ETIQUETTE

for pot modding facts click below

http://laserpointerforums.com/f51/pot-modding-faqs-40510.html

04-20-2012, 12:59 AM #2
 Class 4 Laser Join Date: Aug 2007 Location: Netherlands Posts: 7,623 Rep Power: 210024
Benm
Class 4 Laser

Join Date: Aug 2007
Location: Netherlands
Posts: 7,623
Rep Power: 210024
Re: Math/Electricity HELP!!!

No, a 20 watt 120 vac pump will consume 20 watts. A 50 watt 12 volt model will consume 50 watts, PLUS whatever is lost in the variac and rectifier (for a total of 60 watts or so).

Here in the netherlands we have a rule of thumb that running 1 watt 365x24 costs roughly 2 euros a year. In the US this figure will be lower (perhaps \$1.50 or so) since your energy taxes arent as bad as ours.

04-20-2012, 02:12 AM #3
 Class 3B Laser Join Date: Dec 2008 Location: Riverside, California Posts: 4,011 Rep Power: 1444
chipdouglas
Class 3B Laser

Join Date: Dec 2008
Location: Riverside, California
Posts: 4,011
Rep Power: 1444
Re: Math/Electricity HELP!!!

This is where I lose the concept or over think it... So 20 watts @ 12vdc will cost more than 15 watts @120vac? Since I'm reducing the ac so much I thought I'd save a ton

Michael
__________________
IN A CONSTANT STATE OF PICNIC

I AM THE STATUS QUO

ARE YOU A NEW MEMBER, OR EVEN MORE, ARE YOU NEW TO ONLINE FORUMS... READ THIS
LASER POINTER FORUM ETIQUETTE

for pot modding facts click below

http://laserpointerforums.com/f51/pot-modding-faqs-40510.html

04-20-2012, 02:14 AM #4
 Class 3B Laser Join Date: Dec 2011 Location: Michigan's U.P. Posts: 4,382 Rep Power: 3121
Sigurthr
Class 3B Laser

Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 3121
Re: Math/Electricity HELP!!!

A watt is a watt is a watt, no matter the voltage. You pay for electricity by the watt.

It could be 50Watts at 10,000V and still cost less than 100Watts at 12V.

(Volts x Amps = Watts)
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert

04-20-2012, 02:17 AM #5
 Class 3B Laser Join Date: Dec 2008 Location: Riverside, California Posts: 4,011 Rep Power: 1444
chipdouglas
Class 3B Laser

Join Date: Dec 2008
Location: Riverside, California
Posts: 4,011
Rep Power: 1444
Re: Math/Electricity HELP!!!

Thank you guys. It's amazing how simple something can be when explained properly.

Michael
__________________
IN A CONSTANT STATE OF PICNIC

I AM THE STATUS QUO

ARE YOU A NEW MEMBER, OR EVEN MORE, ARE YOU NEW TO ONLINE FORUMS... READ THIS
LASER POINTER FORUM ETIQUETTE

for pot modding facts click below

http://laserpointerforums.com/f51/pot-modding-faqs-40510.html

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

All times are GMT. The time now is 06:09 AM.

 -- DarkShadows V5 -- Responsive LPF -2562016 -- Default Style Contact Us - Laser Pointers - Archive - Top