On Wed, 13 Aug 2014 18:37:24 -0700, Jim Thompson
wrote:

On Wed, 13 Aug 2014 18:02:27 -0700, John Larkin
wrote:
[snip]


This is one of those annoying cases where the OP has vanished after
the initial post and is not answering questions. Without more info,
it's a wasted effort.

Something along the lines of Field's relay method post... maybe with
MOSFET's... is most likely to succeed... just needs the right
controls
:-}

...Jim Thompson


Jim... I haven't vanished, just out of town. I don't quite understand
what clairification you require... 10 caps in series to give 27VDC total
operating voltage.. each with "something" in parallel to prevent over
voltage... overvoltage will cause "super capacitors" to short and fail..
that "something" must be such that it will not discharge the capacitors
when the 25 volts is removed, turned off, disconnected, not charging,
etc.

Bill

Do you know how much voltage is safe for those caps? Do you have a
voltage:current curve?

Do you have a clue? Not likely :-}

...Jim Thompson

Look at some supercap data sheets. On most, the only spec is operating voltage
and ESR. I've never see a voltage vs leakage current curve.

Seems to me that if you want to protect these things, you should know something
about them. And if it's not on the data sheet, measure a few. If I had any, I'd
measure them myself.

If they are charged by a modest constant current, do they go POP like a
film-foil cap, or do they just level off, like a wet electrolytic? [1] I'd
suspect the latter.

Would a series string self-equalize? A v:i curve might answer that question.

You seen to be promoting ignorance. Nothing new there.

[1] polymer electrolytics go POP!


--

John Larkin Highland Technology Inc
www.highlandtechnology.com jlarkin at highlandtechnology dot com

Precision electronic instrumentation