PSU for 12v motors

Hey there, would a PSU like this one do two wiper motors?
http://www.seasonicusa.com/S12II-Bronze.htm
it lists a 12v combined of 48A. If this is true, then modifying this could be a good idea for wiper motor power as well as control board power.
What do you think?

You have to be careful with PC power supplies, sometimes they split power unevenly on two (or more) 12v rails. So you may not be able to pull 48A through just one leg. Usually they'll advertise Single 12v rail or some such thing.

True, I actually found that a computer psu of at least 15 amps output on the 12 volts wired in parallel with a car battery does very well. That way, you can have a cheap psu with a car battery. The psu will provide general power and the battery will help with big spikes of current draw.

Hi bsft
how did you wire the PSU and the battery? Can you draw a schema? (I'm getting nervous when it comes to wiring the wrong things together ;-))

I was thinking of using a battery charger like this Einhell BT-BC 30. From the spec this beast looks quite a nice choice. It delivers 30 A continuous, 100 A peak. Would there be any restrictions in conjunction with a Pololu jrk, e.g. stability of the 12 V?

pic attached, obviously shown as 6 volt, but I use it for 12v.
As for the Pololu, http://www.pololu.com/catalog/product/1393 it will handle 6-16 volts, with a peak drain of 30 amps. I run mine at 22.5 amps peak with heatsinks on the big chip and a fan, all good.
Dunno about the battery charger, it looks like it would do it.

This is a great idea! I've got a spare lead acid 12v battery, I'll probably end up using something similar to this setup.

Thank Eaorobbie for this info on the battery backup, he suggested it. And it works.

I'm going to use switching power supplies. They are cheap and regulated. I have used several different models on my CNC router as I have upgraded the drivers on it. 24 V 36 V and now on 48 V. They are very cheap on Ebay.

To find various models on Ebay use the following search phrases:
switching 12v
switching 13.8v
switching 15v
switching 24v

ah yes i too use a 12v switching unit rated a 20amps but the jrk i use can draw 30amps at peak, so i have 12v car battery at 600cca to backup the powersupply as it trips momentarlly when the jrk goes to flat out. ie going fom lowest to highest piont in a split second, almost throws ya out out the seat. Good suggestion but recommend a 12v battery in the loop too.

A battery is a god idea, but I want to use PSU's. I have a 1000 W 12 V switching PSU that I use to charge my RC batteries. That's 83 A. I can use that on the sim until I get a new PSU. A 1000 W 12 V PSU like the one I have costs $143 (plus $71 shipping) on Ebay. A 500 W 12 V PSU costs $48.44 (plus $30 shipping) on Ebay. Looking more carefully into the different aucions you can probably fine some with slightly lower shipping+item prices .

Would a big capacitor work as well? What size should it be at least?

Use a car battery or high current drain battery.