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Asked — Edited

12V To 7.5 Step Down Converter

I want to run my Mini-ITX off of my 12v battery supply which here are the specs for the battery,(26AH 12VOLT SEALED LEAD ACID DEEP-CYCLE RECHARGEABLE SLA BATTERY 26 AMP HOUR 12V) and I want to use a step down transformer, however they come in all kinds of AMPS. I have seen several at 15w 2 and 3 AMPS and one at 75w at 10 AMPS. I would like to know what one to use to power my Mini-ITX, any suggestions.
Thanks

#2  
@tymtravler , ezb fuses at 5amps , I picked up 8amp stepdown converters cheap on eBay..
User-inserted image

This gives wiggle room to run ezb and also some high torque servos that directly powered from ezb would be too much.
#3  
Please note, most picoPSU DO NOT regulate the 12V line to the motherboard & peripherals (they rely on the 12V AC-DC adaptor their meant to be used with for that)... And 12V batteries fluctuate between ~13.5-11volts depending on state of charge.

There's 2 solotions to this:
Run a Boost/Buck converter like this Industry Grade DC 8-40V To DC 12V 6A Step-up&down Converter that'll output exactly 12V no matter what the battery does, before the picoPSU.
Or, get a picoPSU like this one: PICO PSU-150WVN DC-DC ATX Power Supplier,16-24V Input,150W and run that off a Universal Car Charger Adapter Power Supply for Laptop Notebook set to 19V.
#4  
Tymtravler if you want a 160 watt dc to pc regulated 20 or 24 pin atxpower supply ill sell ya 20 bucks
#5  
@jstarne1, will it work with this Mini-ITX?

ASRock E350M1 AMD E-350 APU (1.6GHz, Dual-Core) AMD A50M Hudson M1 Mini ITX


that I found on ebay

PS-Do you take Paypal?
#6  
here is a perfect one i use ,input down to 6 volts and up to 24 volts
dont need a boost converter or higher rated battery 125 watts and they make others with low voltage input with higher wattage out

m3-atx pico psu
rated at 125 watts 150 max
and handle a dual core 1.6 mhz easy

here is some specs on it
- Very small, can build ultra-compact PC enclosures and slim server enclosures.
- Programmable shutdown / sleep modes via optional serial cable.
- Fits any motherboard equipped with a 20 or 24pin ATX connector.
- 100% silent, fanless, no moving parts.
- Operates from 6-24V, multi-chemistry batteries supported.
- Highly efficient design, does not produce a lot of heat.
- Ideal for low power Intel Core Duo as well as all VIA or AMD processors.
#7  
Yea tymtravler , this will work great for that board and your choice of drives. Only reason I'm not using this one is I upgraded to a 250watt 300max power supply because of my video card and all my fans. My PayPal is kandyred@gmail.com add $5 for the box , bubble wrap and postage. I bought this PSU for 50 so your getting a deal sir:)