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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.


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@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.
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.
Tymtravler if you want a 160 watt dc to pc regulated 20 or 24 pin atxpower supply ill sell ya 20 bucks
@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?
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.
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:)