5watt 12volt heater?

Here's the situation:
I have a small amount of pipe exposed to the outside. (no way to drain
it or get power to the location)
My plan is to build an insulated box around it and use a solar panel,
battery and thermostat to trigger a small heater when ever the box
gets cold.
Must be a better heater/thermostat...
here's what i was thinking of buying:
Panel:
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Would a heater like this work?
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A thermostat like this?
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Thanks!
Reply to
eksaint
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Assuming you're thinking of one solar panel, you're proposing to use a heater drawing 16-17 amps and recharge the battery with a current source of less than half an amp. So, assuming 100% efficiency, which you won't get by a very long margin, you would need 35 minutes of sunshine to cover one minute of heat. Or six hours for ten minutes. Hmmmmm
John
Reply to
John Nice
In theroy the heater would run very rarely. Just to keep the super insulated box above 32 degrees. Are you recommending more panels? Or is there a bigger one you see that would work at the site I linked to?
Thanks very much!
Elijah
Reply to
eksaint
In article , eksa> Would a heater like this work?
You don't say how long your pipe run is or what external temperatures fall to in your neck of the woods. If you insulate well I think rather less power will be needed than you are proposing.
You ought to look into heating tapes like these:
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or consider a suitable length and gauge of resistance wire.
You wrap the stuff round the pipe and then enclose in insulation.
Reply to
Stuart
It's a very short run about 12" sticking out. Brooklyn ny, maybe down to 0 once and awhile but mostly 20s
I'll look at that heat tape, thanks for you help!
Reply to
eksaint
It's a very short run about 12" sticking out. Brooklyn ny, maybe down to 0 once and awhile but mostly 20s
I'll look at that heat tape, thanks for you help!
Reply to
eksaint
I've seen it done with a power resistor clamped to the pipe. A 30 Ohm resistor will dissipate about 5 Watts when powered from 12V and can be had for little or nothing. As someone else said though you can buy heat tape specifically for this purpose.
Reply to
James Sweet

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