Hello everyone, first post here...
Is it possible to combine the outputs 3.3v,5v,12v in series without any problems?

As an example, this Antec BP550 Plus 550W -
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371016

3.3v + 5v + 12v
= 20.3v, 22A total output

 

No, they share a common ground.

 

No, they share a common ground.

Thank you SgtWookie.
Regarding server power supply, can it be used as a bench lab p/s by powering it up using the method used in atx?

http://cgi.ebay.com/Artesyn-2291170...emQQptZLH_DefaultDomain_0?hash=item3ef76e91b6

 

Do you have a specific need for that much power?

The auction you linked to basically states that the supply is "AS IS" - if it's dead, you've spent about $55 on a doorstop.

 

It is just the right power I need to charge the LiFePO4 pack of my EV.
His return policy states "7 days after the buyer receives it" and "Refund will be given as Money Back". Ebay will also cover original shipping.

 

Unfortunately, it's not the right power supply to use as a charger.

If you connected a dead battery pack and plugged the supply in, the battery will look like a heavy overload, and the supply will shut down.

You need a unit that is specifically designed to charge LiFePO4 batteries. Otherwise, you risk a nasty fire.

 

Unfortunately, it's not the right power supply to use as a charger.

If you connected a dead battery pack and plugged the supply in, the battery will look like a heavy overload, and the supply will shut down.

You need a unit that is specifically designed to charge LiFePO4 batteries. Otherwise, you risk a nasty fire.

My question is How to power-up the server p/s mentioned earlier, Not if this p/s will work with my pack.
You don't even know the capacity, voltage and charge rate of my cells and just assume that it won't work?

Some bit of info regarding LiFePO4s which I think you are not familiar with.
Lithium iron phosphate batteries is a safe Lithium battery chemistry. They don't go into Thermal runaway leading to a fire. They don't burst in flames when over charged, under discharged, punctured or smashed like garlic. One of the well-known brands is made by A123 Systems.

Excuse me sir, in your "fire safety" comment, you maybe referring to other conventional lithium-ion battery chemistries:
Lithium polymer, Lithium oxide, Lithium cobalt = Dangerous if mistreated

Have a nice day.

 

OK, so why don't you give us the specifications of your battery, preferably the manufacturer and model number, and a link to the specific datasheet for your battery or batteries?

Whatever it is, that doesn't change the fact that if the current ratings of the power supply you are considering are exceeded, it will simply shut down until the load is removed, and the power to the supply is cycled (removed for 10-30 seconds, and then turned back on.)