DC-DC conversion

[jonescg]

Switchmode power supplies are available form Jaycar here in Australia - http://www.jaycar.com.au/productResults.asp?keywords=switchmode+power&keyform=KEYWORD

What I want to know is, will these work well as a ~110V DC - 24 V DC converter? The other issue is that most contactors are 12 V, so maybe a dual supply one might work? might be easier than having an auxillary battery?

 

[MrKang]

If your setup is 24S (108V for Lipo) than you could use this to convert it to 12 or 24DC for your lights etc..

You also could use a simple notebook adapter. these are also based on DC-DC conversion.
Depents what you want to do with the output ? is it for your lights?instruments/panel. ?

 

[jonescg]

I'm running cell-man LiFePO4, as a 3P 32S, so a nominal 105.6 V or 117 V hot off the charger. After a race, and certainly during discharge it could be as low at 90 V. It's mostly to run the controller (kelly 1200 A) and the contactor, as well as the odd little bit of electronic stuff, but no lights or anything. Maybe a horn.

 

[olaf-lampe]

I'm running cell-man LiFePO4, as a 3P 32S, so a nominal 105.6 V or 117 V hot off the charger. After a race, and certainly during discharge it could be as low at 90 V. It's mostly to run the controller (kelly 1200 A) and the contactor, as well as the odd little bit of electronic stuff, but no lights or anything. Maybe a horn.

As long as you don't need permanent 12V for logging/boardcomputers etc. there is no reason for an aux battery.

You can raise the efficiency of the ac-dc converter by bypassing the rectifier diodes on the input. But then you'll loose reverse polarity protection as well.
-Olaf