> >
>

# turning 450 Watts to 2000 Watts

#1
05-14-18, 12:11 PM
Member
Join Date: May 2018
Location: USA
Posts: 5
turning 450 Watts to 2000 Watts

Working on a new project to power my server which now consumes about 2000 watts. I'm trying lower it to 450Watts by using a electric motor powered from a wall outlet that will turn a car alternator that will charge a 12v DC battery which will be connected to a 2000 Watts inverter where my server will be connected too?

I have no problem running the alternator 24/7 as long as its using 450-500watts for the electric motor- my goal is to save 1500watts - What you guys think?

Attached Images
#2
05-14-18, 12:26 PM
Member
Join Date: Mar 2006
Location: USA
Posts: 33,582
You would be drawing 167 amps from the battery. It won't last that long at that amp draw. Average alternator puts out 100 amps, 67 amps less than you need to charge the battery.

as long as its using 450-500watts for the electric motor- my goal is to save 1500watts -
Basically you would be trying to pour 5 gallons of water from a one gallon bucket. If 500 watts in then max out is 500 watts (minus loses due to mechanical and electrical resistance).

#3
05-14-18, 12:49 PM
Member
Join Date: May 2018
Location: USA
Posts: 5
Thanks for the reply, so even if I got a 167 amps alternator, a max 1000 watts motors, and add a large pulley, the output will still be less then 1000?

#4
05-14-18, 12:53 PM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 24,460

#5
05-14-18, 01:02 PM
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,113
There's NSTAAFL...........................

#6
05-14-18, 02:13 PM
Member
Join Date: May 2018
Location: USA
Posts: 5
its not free lunch, trying to lower the cost of electricity...

#7
05-14-18, 02:33 PM
Super Moderator
Join Date: Dec 2007
Location: USA
Posts: 21,113
Trying to get more output power than there is input power is asking for a free lunch. Basic conservation of energy law.

Since there are losses in any conversion, you actually have to put more power in than you can possibly get out. That's not even including the cost of the devices needed to convert from one form to another.

No matter what faked You Tube video's may appear to demonstrate.

#8
05-14-18, 03:06 PM
Member
Join Date: Nov 2012
Location: USA
Posts: 1,942

https://www.amazon.com/IBM-74P4452-W.../dp/B016YK1364

#9
05-14-18, 06:18 PM
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 60,919
That's a joke.... right Hal.

#10
05-14-18, 07:59 PM
Group Moderator
Join Date: Nov 2007
Location: United States
Posts: 13,808
trying to lower the cost of electricity
If you really want to lower the cost the electricity you have to make an up front investment. Install a wind turbine or solar array. It will cost you thousands of dollars but should pay for itself in 15 - 20 years.

#11
05-14-18, 08:35 PM
Member
Join Date: Nov 2012
Location: USA
Posts: 1,942
Originally Posted by Pjmax
That's a joke.... right Hal.

Not supposed to be.

If the OP has a server that needs about 2000 watts,

the OP needs to buy a high efficency power supply that puts out about 2000 watts.

https://images-na.ssl-images-amazon....L._SL1500_.jpg

#12
05-14-18, 08:49 PM
Group Moderator
Join Date: Oct 2012
Location: Northern NJ - USA
Posts: 60,919
The server is drawing 2000 watts right now from the A/C line.
A different power supply won't change that. A high efficiency unit may save a few watts of power
but not really enough to make the investment worthwhile.