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homebrew load dumps?


By dave123, Section Homebrewed Electricity
Posted on Fri Feb 13, 2004 at 10:36:02 AM MST
Anyone built a sucessful load dump?

Searched the board and did not find anything.  I was thinking that if you had a voltage sensing circuit at the battery that toggled to a load dump above a preset voltage, and toggled back off as soon as the voltage sense dropped below the preset level, it would work as an automatic pulse load dump?  As soon as the load dump toggled on, the voltage sense at the battery would drop below the preset, turning off the load dump.  Since the battery is already fully charged, the voltage sense would immediately rise back up and turn the load dump back on again.  The cycle would repeat itself continuously.  Am I missing something, or could it be this simple?

Also, would there be a problem hooking two different capacity generators (or solar and wind) in parallel to the same load dump circuit, assuming the dump circuit was built to withstand that capacity?  You would have blocking diodes on the output of each generator anyways.

Just trying to get a fairly effective system together with minimal $, and not cook the batteries.

homebrew load dumps? | 5 comments (5 topical)

Re: homebrew load dumps? (none / 0) (#1)
by charged on Fri Feb 13, 2004 at 11:30:14 AM MST

Here's a thread you must have missed. But, I referred to it as a "dead load".

Enjoy!

http://www.fieldlines.com/comments/2003/12/24/135330/52/1#1



Re: homebrew load dumps? (none / 0) (#2)
by Larsanderss on Fri Feb 13, 2004 at 04:30:34 PM MST

Why not take a look at this...?? http://www.homepower.com/magazine/downloads_homebrews.cfm "Shunt regulator". Sounds like a cheap thing to do what You want...... I have built one on a pcb and i use it when charging my gel lead batteries (my charger is not smart enough to do it right by itself).

Lars A



Re: homebrew load dumps? (none / 0) (#3)
by Victor on Fri Feb 13, 2004 at 05:07:53 PM MST

Hi Dave;

 It will not work as you discribed it. Without some hysteresis or something else to slow the frequincy of the circuit the switching device will fry. If it's a transister it will go linear and dissapate a lot of heat. If it's a relay it will chatter and arc

 Hugh Piggott has a circuit for this on his website.

Make the wind fun!
victor



Re: homebrew load dumps? (none / 0) (#4)
by Caballo on Sat Feb 14, 2004 at 12:06:38 PM MST

Read this - http://pdfserv.maxim-ic.com/arpdf/1495.pdf
They also have evaluation kit - http://pdfserv.maxim-ic.com/en/ds/MAX712EVKIT.pdf

That is almost the oldest charge controller, so maybe there are better already - but why change things that work well?



Sorry, a mistake :-( (none / 0) (#5)
by Caballo on Sat Feb 14, 2004 at 03:38:12 PM MST

http://pdfserv.maxim-ic.com/arpdf/1666.pdf

[ Parent ]


homebrew load dumps? | 5 comments (5 topical)
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