Hybrid Car – More Fun with Less Gas

Weak Battery? - Page 2

register ::  Login Password  :: Lost Password?
Posted by Earle Jones on October 31, 2005, 12:11 am

My understanding is this:  The Prius internal-combustion engine
(ICE) is not 'cranked' in the usual sense -- that is, started up
from zero rpm.  The electric motor/generator delivers power through
the planetary gear system, which spins up the ICE (with no fuel
injection and open valves) up to around 700-800 rpm.  Then, when the
computer decides that ICE power is required, fuel injection and
normal valve operation begin.  In most cases, you cannot tell when
the ICE starts and stops.

The owners' manual tells us **not** to use the Prius to jump-start a
conventional engine.  The reverse is not true.  It is OK to
jump-start a Prius from another car.


Posted by Michelle Steiner on October 31, 2005, 12:13 am

That's right, and it does it directly; there's no separate starter.

Stop Mad Cowboy Disease:  Impeach the son of a Bush.

Posted by Michael Pardee on October 31, 2005, 12:33 am
It does indeed! One of the tech wizards in the Yahoo Prius group has
jump-started his Prius with a portable drill battery and a pair of clip
leads. Once the brake booster gets pumped up, all the 12V battery does is
boot the system and let the hybrid system spin the engine up. Pretty slick!


Posted by Fred on October 30, 2005, 9:38 pm
 But the Battery doesn't provide total power for jumping another car - the
entire 12v power system does.  I've used my Prius to jump start another car,
with the Prius in Ready mode, with no problem at all.

Posted by Bill on October 31, 2005, 1:05 am

Sure, however the fact that the other car needs to be jump-started is
indicative of a problem.  If it simply has a low battery then jumping it
with a Prius could work.  If it's battery has a shorted cell, or if it has
bad starting motor, inverter or extremely cold lubricants; anything that
results in an extra-ordinary load, then you could blow the Prius 100 amp
fuse or, worse yet, it's regulator.  I wouldn't take the chance.

This Thread
Bookmark this thread:
  • Subject
  • Author
  • Date
|--> Re: Weak Battery? Michelle Steine...10-30-2005
---> Re: Weak Battery? Mike Rosenberg10-30-2005
please rate this thread