wires at minus temperatures

akfishguyDecember 1, 2013

I have a weather station, I have hard wired to the house, wiring goes from a 110ac converted down to 3v and then about a 8 ft run out to the outside, up a mass ... All is great till -20 hits, then the unit says it has no power. I used simple house speaker wire, but am thinking, the cold zaps it and it can't carry the power to the weather station. What gauge do I need to run to make this work?

Thanks

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petey_racer

Cold should actually help conductivity. I bet it's a connection, splice, transformer or something like that.

    Bookmark   December 1, 2013 at 7:59AM
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akfishguy

check all connects still soldered good, I put spacers under the wires going to the contacts, the batter compartment, i can't even get one of those pencil solder guns into it...so I took wood, cut same size of batteries, cut groove into side, laid wires, up along, then across the top, it gets power. But then it stops so might be the machine?
T

    Bookmark   December 1, 2013 at 5:29PM
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bus_driver

Conductivity of copper wires improves as the temperature is lowered. But speaker wire will not conduct very much current very far at 3 volts, especially at higher temperatures. The apparent relationship between low temperatures and non-operation is baffling. If batteries were involved, the possible problem would be easy to guess.
Have you tested the voltage output of the transformer when the problem is evidencing itself? And tested at the other end of the conductors?
I suggest rewiring with at least 16 gauge. That may or may not help. But it cannot do any harm.

    Bookmark   December 1, 2013 at 6:18PM
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saltcedar

Probably a 'cold' solder joint on the PCB. If your skills are up to it you could try reflowing any suspicious looking connections. Power connectors would by the first place I'd look.

    Bookmark   December 2, 2013 at 9:35AM
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ionized_gw

Batteries? What kind of batteries and where are they? Some types can not provide power very well at low temperatures.

    Bookmark   December 2, 2013 at 4:43PM
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ionized_gw

Batteries? What kind of batteries and where are they? Some types can not provide power very well at low temperatures.

    Bookmark   December 2, 2013 at 4:48PM
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weedmeister

I need to understand what is really going on. Is the outdoor unit designed to be battery operated? Is there a separate indoor unit? Do they communicate wirelessly or wired? If the outdoor unit was designed for battery operation, did you substitute your wood block wirey thingy to supply power?

From the specs, what is the operating temperature range?

    Bookmark   December 2, 2013 at 7:13PM
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