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c40 or dump controller | 5 comments (5 topical)

Re: c40 or dump controller (3.00 / 0) (#2)
by ghurd on Tue Jun 23, 2009 at 09:28:30 PM MST

Like Roy said.
Use the C40 in diversion mode. It IS a dump load "controller".

Notice it 'controls' a dump load. It does not have a dump load in it.
It needs an external load.

Power resistors are best for a dump load. Especially in that system.
It would not be good to try to save a Loonie by using light bulbs if nobody will be there for 2 weeks. Hate to ruin the batteries over a burned out light bulb.

I recommend using much higher wattage resistors than necessary too.
The system could be in a situation to be dumping 100W for weeks at a time.

Might get a better understanding by reading this story,
http://www.fieldlines.com/story/2009/6/18/14139/1634

I have a few, new, very serious mil-spec power resistors from a canceled project that would be great for this. Email me if you have any interest in them.
G-

Re: c40 or dump controller (3.00 / 0) (#3)
by electronbaby on Tue Jun 23, 2009 at 10:36:02 PM MST

I know you meant it, but you didnt specify for the original poster:

Higher wattage is ok.

The resistance value is critical for controller longevity.

:-)
Have Fun!! RoyR KB2UHF
[ Parent ]

Re: c40 or dump controller (3.00 / 0) (#4)
by ghurd on Tue Jun 23, 2009 at 11:06:15 PM MST

Great call.

It breaks my heart to tell someone their half-price ebay deal on a 150K 500W resistor is useless in a 12V system.

Breaks my heart more to re-explain why it will not dump 500W even though 500W is printed on it.
G-

[ Parent ]

c40 or dump controller | 5 comments (5 topical)

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