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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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6 to 12v conversionViews : 3743 Replies : 51Users Viewing This Thread : |
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Apr 1st, 2020, 12:54 | #41 |
arcturus
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No info on that.I thought that some one might know that's why I posted photo of part number. My google search came to nothing.
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Apr 1st, 2020, 13:12 | #42 |
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Arcturus;
Simplest is to measure the current at 12V, then run the calculations at (https://www.sw-em.com/Vintage_Volvo_...ping_Resistors) for the R value, and use that value. Bill M. also reports there he used a 0.6Ohm DR when he did his conversion. Cheers |
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Apr 1st, 2020, 13:29 | #43 | |
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Quote:
If not there are other ways and means of working out the current, i just wanted the easy route first!
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Apr 1st, 2020, 14:32 | #44 |
arcturus
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Found this from Ron
nother more realistic example (I am told, that the single speed, PV444 6V wiper motor draws 5 Amps). ...more Kung-Fu: Resistance = R = V / I = 6 / 5 = 1.2 Ω (Ohms) Power = P = V X I = 6 X 5 = 30 Watts (a significant amount of heat!) Just need to source a suitable resistor. Can you advise?
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Apr 1st, 2020, 16:07 | #45 |
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A 1.2 Ohm 50W (you always want the wattage to exceed the expected power by some margin) or 5x 6 Ohm 10W resistors in parallel. or 10 x 12 Ohm 5W resistors in parallel.
The neatest and as far as i can see, most cost effective way is this : https://www.ebay.co.uk/itm/50W-0-1-8...s/183758297337 Select 1.2 Ohms from the drop-down and take CV-19 precautions for example spraying it with IsoPropyl Alcohol before using it.
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Apr 1st, 2020, 16:44 | #46 |
arcturus
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thanks,a big help. I'm totally useless with electrics and also number dyslexic. More than three digits and my brain turns to mush.
Will order two and connect in parallel to keep heat down,OK?
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life's too short to drink bad wine Last edited by arcturus; Apr 1st, 2020 at 17:06. |
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Apr 1st, 2020, 20:43 | #47 | |
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Quote:
If you really want to put two in parallel, get 2.4 Ohms as in parallel, it'll give you 1.2 Ohms. The formula for equivalent resistance of resistors in parallel is (R1 x R2) / (R1 + R2). For example, two 100 Ohm resistors in parallel (100 x 100) / (100 +100) = 10000 / 200 = 100/2 = 50 Ohms. Funny things can happen when multiplying decimal point values so if you said 24 x 24 / 24 + 24 = 576/48 = 12 and then replace the decimal point you "lost" for convenience, it's 1.2 Ohms again.
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Apr 1st, 2020, 20:48 | #48 |
arcturus
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Thank's.head gone into tail spin
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Apr 2nd, 2020, 09:44 | #49 |
arcturus
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What a b*****d,they wont ship to Portugal!
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Apr 2nd, 2020, 10:02 | #50 |
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Have you any relatives/friends in the UK that would be willing to receive said resistor and forward it to you?
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