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 Szumlanski Fafco Solar From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Exeltech Sent: Thursday, September 01, 2011 3:58 PM To: RE-wrenches Subject: Re: [RE-wrenches] unique battery bank design question Mac, Don't tap the battery. Bad idea. Uneven loading = unequal charge/discharge, which leads to shortened battery life and other troubles. Better idea: If you know the maximum load current, use high-efficiency DC-DC supplies of adequate current and other ratings to step 48V down to 12 or 24V. Dan Sr. Engineer Exeltech --- On Thu, 9/1/11, mac Lewis <maclew...@gmail.com> wrote: From: mac Lewis <maclew...@gmail.com> Subject: [RE-wrenches] unique battery bank design question To: RE-wrenches@lists.re-wrenches.org Date: Thursday, September 1, 2011, 2:52 PM Hello wrenches, I have a battery bank questions. I have an Oil & Gas client interested in setting up an off-grid control system that has a various DC loads at 12VDC, 24 VDC and 48 VDC. My thought is to build a 48 V battery bank and tap off the bank at various points to create a 12V bus, 24V bus and 48V bus. I am a bit concerned about unequal loading of the batteries. Has anyone dealt with something like this that would like to share some insight? Thanks -- Mac Lewis
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