I have a moving system at 20meters from, say, a base station. The system consumes more or less 200W at 12V. I used until now a battery to power the system. The main drawback is that I have to recharge the battery quite often.
Therefore I need to find a solution to power the system. The system should be lightweight. This leads to some limitations. I was thinking of leaving the battery solution and choose to connect the system to the base station.
If I try to transmit directly 16Amps at 12V, I will have to use a huge cable (and heavy). I would rather transmit a bigger voltage with a smaller current and then use a small DC-DC converter on the system.
I was thinking of these kind of lightweight DC-DC converters:
VPT DV200-2812S or DV200-2815S In 16-50V, Out 12-15V, Out power 0-200W, 115 grams, 6x6x1cm http://vpt-inc.com/Products/?prod=5
XP Power QSB35048S12, in 48V, out 12V, out 29.2A, power 350W, 114grams, 6x6x1cm http://www.xppower.com/pdfs/SF_QSB75-350.pdf
MTM Power 132-200W PMD200 48S12 UHB In 48V, Out 12V, Out max 16.7A, 6x6x1cm
VICOR DC-DC converters
What is your opinion on this solution?
Remember: Voltage 12V Power around 200W Distance from base station to main system 20m Main system must be lightweight