Propex Amperage

[@johanvangelderen289]

It's always helpful if people specify if they are talking about C or F degrees. You have a huge light reflection from your thermometer. Can't tell if it's room temperature 22 degrees C, or a frosty 22 degrees F.

[@TIMWHY2]

Thank you I am aware of it. The temps are in F

[@carpenterfamily6198]

Hmmm - I suppose the ducting could affect back pressure / pneumatic load 'seen' by the fan - which I guess that might affect amps drawn by fan. But I wouldn't have guessed that it would have made much difference.

[@immrnoidall]

you have a 90' turn right at the outlet. that is very restrictive.

[@richardbennington6289]

Power = volts X amps. In the first part of the test, the voltage us at 12.7 volts. In the second part of the test, the voltage is at 12.4. One would normally expect the current draw by a motor(the fan) to go up as the voltage drops. In this case it drops. So there may be some validity to having a longer input path, but to really know, you should have identical input voltage in both tests. So hook up a stable DC source and try again.

[@Endless_Skyway_Adventures]

Air in a tube behaves like a fluid, length of the tube increases resistance to flow so it makes sense that increasing tube length would use more power. The bends in the tube increase turbulence an resistance. You would expect to see less resistance and more favorable power consumption as Reynolds number decreases (turbulence decrease) can you make the tubes more direct?

[@TIMWHY2]

no

[@timk404]

The results of the test you did are completely predictable. The blower used in the propex is a centrifugal/squirrel cage blower. The more air they move the more power they draw, by adding the additional tube, it increased the drag in the system and reduced the air moving through the system so as a result you saw a small reduction in power draw (remember, that fan is not the only power draw). By reducing the amount of air moving through the heater you also reduced the efficiency of the heater though so in the end reducing the 12v consumption you increased your propane consumption.

[@averagerider92]

Do you have the us or uk propex? If UK, which regulator are you using and howse it working?

[@TIMWHY2]

I am in the US, the heaters are the same I believe. The difference being the regulator here in the US is set at 11WC as appose to the UK's almost 15WC. My Propex has had no problem working at the lower pressure. The regulator is a Marshall two stage.

[@averagerider92]

@@TIMWHY2 thx. Seems like you ordered your propex from vancafe or westy? They are jetted for 11wc for us standards. The issue with me is I ordered mine from UK so its set for 14wc, was wondering what you were running to get an idea if ill have problems running a 11wc regulator on the 14wc propex. Happy morning BTW m, up early :)

[@loveu2222]

what are you talking about?

[@vantime2911]

I was kinda wondering the same thing? Ducting and amperage. Seems to be two things that don't fit together. I can understand hot air output in BTU's and the unit's power consumption in amps. Oh well live and learn Guess I am wrong. LOL

[@lukesimmons8364]

hes talking about his miniature furnace, dawg

[@rambolambo5754]

What is the propane consumption ?

[@TIMWHY2]

That would depend on how cold it is and what your desired temp would be?

[@rambolambo5754]

i was just wondering how long a 20 pounder would last.

[@TIMWHY2]

www.propexheatsource.com/energy-efficiency/ From Propex with 29 lb of propane as an example, but easy math with the consumption per hour

[@JeepTherapy]

After 10 hours you save 1ah? 🤪

[@TIMWHY2]

The draw is how many amps per hour.