i was just recommending that you try it with some form of a load because without a load you may get different results , i dont know how your controller works so it could really suffer under load conditions voltage- current
maybe just put a bike turn indicator globe as a load and see how the glow changes ....its an easy thing
= ohms law
quoted from some page on the internet ....but pretty helpfull
Though not part of the original theory, in later years, we have also attributed the Power factor to Ohm as well. Power is usually abbreviated by (W) and measured in
Watts. The formula generally given for Power is:
W = V x I or W = I
2 x R or W = V
2 / R. Other basic formulae involving Power are:
I = W / V or I = (W / R)
2V = (W x R)
2 or V = W / I
R = V
2 / W or R = W / I
2where V = voltage (should read as "E") I= current R= resistance or ohms ...watts is normaly the sum of E x I in lots of circuits so abreviated to "va " in many cases ...its an electrical ac trade thing
depending on the temperature and insulation properties you may be surprised how many watts of power is required to heat something up ...now were not talking about a bar radiator in the lounge room... lol ...a lot less
what i can suggest is .... point reference heat is really hard to spread to where its needed without getting a hot spot
ipso facto, better to spread the heating element over a larger area or run 2 circuits so that at any one point you get a more even temperature spread and keep the overall current draw a bit lower ....all rather obvious i guess
unfortunatly i have no experience in what is needed for warming up things up there in your climates in wattage terms ... but i imagine 20 to 60 watts (2- 5 amps ?) spread over a large area ...like a jacket ? having it contuinuously variable is a bonus ....i guess when you get it right you might put some markers on the adjustment device
sorry for being a techno speak type person ...i guess its just the world that i live in