Hi Jason, Well designed off-the-shelf converters can achieve 90% efficiency, and as you mention, this will vary a bit depending on the rated output current of the converter vs. the actual load current.
I've designed and built 24V @ 25A to 12V @ 50A converters for my own use that are in the 95% realm. Your mileage may vary. Dan --- On Thu, 9/1/11, Jason Szumlanski <[email protected]> wrote: From: Jason Szumlanski <[email protected]> Subject: Re: [RE-wrenches] unique battery bank design question To: "RE-wrenches" <[email protected]> Date: Thursday, September 1, 2011, 3:07 PM Dan, What kind of efficiency level (%) can you get out of a DC-DC supply on a small load, say <5A @ 12V with a 48V->12V converter? Is the efficiency level highly variable depending on load as a percentage of the converter’s maximum capacity, or is it pretty constant? I run into this once in a while, so this piece of information would help me make some better decisions. Thanks, Jason SzumlanskiFafco Solar
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