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Neil
- Jan 1, 1970
- 0
Can anyone recommend a thermostat that does not require a power supply and
can switch a 12v heater?
can switch a 12v heater?
Neil said:Can anyone recommend a thermostat that does not require a power supply
and can switch a 12v heater?
Larry said:12V heater??
Please tell me you're not trying to heat a boat with a 12V
heater....please?
A bathroom heater is 1500 watts, about. If we do a little math, 1500
watts divided by 12V = 125 amps! That might work overnight with a
set of 6250 AH submarine batteries...(c; But, alas, they're about 4
ft X 5 ft X 7 ft high and weigh a couple tons per cell....(sigh)
Sorry, doesn't float. A boat doesn't have anywhere near enough
battery power to heat anything more than a quick cup of coffee or a
soldering iron for a few minutes.
I also have a joke that goes along with that....
"Nothing is funnier than a boater with a new 4000 watt inverter
carrying his electric heater down the dock with a big smile on his
face."
I'm not trying to make fun of you, really. There's a hundred boaters
at City Marina who bought one of those damned 12V heaters Waste
Marine sells in every store. I'm convinced they sell them so they
can sell more batteries, but can't prove it. By the way, they don't
need a thermostat. They barely get warm!
Sorry if it bothered you. You're not alone. Go plug the boat back
into the dock. Thanks. If your boat is gasoline powered, please
don't use any thermostat-controlled 115VAC heater, either! Any gas
fumes that get sucked into that heater at the moment when the points
in the thermostat open may blow up your whole end of the marina! Run
the heater in the dark and turn the thermostat until the heater shuts
off. Big spark at 15A off 115VAC....BOOOM!
Jasen said:t
Thare exist mains rated bimetallic thermostats that can be used to
switch a relay to control your 12V load.
what is it you want to take the temperature of?
what is it you want to heat, and what is your heat source.
Er.............I think he means a 12-volt Eberspacher or similar, using
diesel to heat the boat? If I'm wrong, your maths is correct, but but I
would find it difficult to believe that anyone could be so mad!
Neil said:Heater is a 12v 100watt ceramic heater
Larry said:Make a little test before going farther down this slippery slope.....
Put a 100W lamp in the boat at dusk. Measure the temperature when you
start. Come back in the morning and see how hot it is inside the boat from
this 100 watt heat source. I doubt it will raise the boat 1 degree. That
will make it 11F inside when it's 10F outside....unless the wind is blowing
through any hatches not hermetically sealed.
If you can't try this on the boat, try it in your garage WITHOUT parking
the warm car in there. Set a 100W lamp on the center of the floor at dark
and check it in the morning. The boat isn't insulated like the garage,
either.
Neil said:The ceramic heater is not a lamp, it will in 15 minutes defrost all the
glass in a Mercedes Estate car and raise the interior temperature to
acceptable before starting. Trying to source an appropriate thermostat to
operate it in the boat's water tank compartment.
Neil
Neil said:The ceramic heater is not a lamp, it will in 15 minutes defrost all the
glass in a Mercedes Estate car and raise the interior temperature to
acceptable before starting. Trying to source an appropriate thermostat to
operate it in the boat's water tank compartment.
Neil
Gordon Wedman said:Granted your ceramic heater puts out more heat than a 100 watt light bulb
On what planet do your Laws Of Physics, reside...... 100 Watts is 100
Watts.... it doesn't matter if that comes from a light bulb or a
ceramic heater.....Ok now you say that the light output must be
subtracted from the 100 Watts, BUT, so does thew glow from the
ceramic heating element as well. Both are RESISTIVE Loads, both
produce 100 Watts of energy into the enviorment...Again 100 watts is
100 Watts...... back to High School Physics for you.....
Me
Me said:On what planet do your Laws Of Physics, reside...... 100 Watts is 100
Watts.... it doesn't matter if that comes from a light bulb or a ceramic
heater.....Ok now you say that the light output must be subtracted from
the 100 Watts, BUT, so does thew glow from the ceramic heating element
as well. Both are RESISTIVE Loads, both produce 100 Watts of energy
into the enviorment...Again 100 watts is 100 Watts...... back to High
School Physics for you.....
Me
Since the heater is designed to put out HEAT and the light bulb is designed
to put out LIGHT I suspect there could be some differences. Go back to your
own high school class and learn some manners.
Gordon Wedman said:Since the heater is designed to put out HEAT and the light bulb is designed
to put out LIGHT I suspect there could be some differences. Go back to your
own high school class and learn some manners.