Notes:
(1) Use specifications for horsepower ratings as general guideline only.
(2) For
on-highway trucks, this assumes concurrent use of high-beam headlamps, tractor lights, heater blower and minimum trailer lighting. Use of many electrical accessories will increase the
necessary alternator rating.
(3) Amp hour draw for 5 minutes preheat. Most 12V heavy-duty batteries are rated at approximately 80 amp hours. |