Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - Tested: power draw of Geo Metro accessories & systems (volts, current/amps, watts)

jedi_sol · 08-14-2009, 05:22 PM

The headlights are rated at 12v @ 55w. So if i multiply that by two, I should only be reading at 110w at lo-beams.

Further testing shows, when i hook up the DMM to the actual passenger side headlamp in series, its only drawing about 4amps (x2 headlights = 8amps x 11.8v = 94w)

But when i hook it up to the battery, it measures 9amps (x2 headlamps = 18amps x 11.8v = 212w) (this is with only 1 headlight attached, i removed the driverside headlamp). But I guess it just means its also measuring all of the other electrics as well?

Which would be the more accurate reading? From the headlamps (94w) or from the battery (212w)?

08-14-2009, 05:22 PM	#22 (permalink)
jedi_sol Master EcoModder Join Date: Mar 2009 Location: Tustin, CA Posts: 929 2013 STi SOLD - '13 Subaru Impreza WRX STi Subaru Sports Cars Team Turbocharged! 90 day: 26.59 mpg (US) 1996 Geo Metro RETIRED from Ecomodding - '96 Geo Metro Base 90 day: 58.68 mpg (US) Thanks: 368 Thanked 380 Times in 238 Posts	The headlights are rated at 12v @ 55w. So if i multiply that by two, I should only be reading at 110w at lo-beams. Further testing shows, when i hook up the DMM to the actual passenger side headlamp in series, its only drawing about 4amps (x2 headlights = 8amps x 11.8v = 94w) But when i hook it up to the battery, it measures 9amps (x2 headlamps = 18amps x 11.8v = 212w) (this is with only 1 headlight attached, i removed the driverside headlamp). But I guess it just means its also measuring all of the other electrics as well? Which would be the more accurate reading? From the headlamps (94w) or from the battery (212w)? __________________ See the rest of the Sti project log: http://ecomodder.com/forum/showthrea...log-26612.html Last edited by jedi_sol; 08-14-2009 at 05:30 PM..