09-24-2017, 07:53 PM
A mechanical fan has to push enough air to provide the needed cooling for the maximum heat generated at each engine RPM. A 2 speed fan or an on/off fan can provide savings over an always on fan. Multiple fans provide even greater variability and the electrical controls can more easily provide further variability.
On top of that, Prevost has designed the electrical system so that it tries to charge the batteries preferentially when the engine is at zero fuel (coasting) so that the electricity is produced by gravity. On the flat roads you only gain when stopping or slowing down. On the hills, lots of free juice. They also put electronic controls on the air compressor for this same benefit. They have proven this works, the question is, can something like this benefit us in a retrofit situation?
On top of that, Prevost has designed the electrical system so that it tries to charge the batteries preferentially when the engine is at zero fuel (coasting) so that the electricity is produced by gravity. On the flat roads you only gain when stopping or slowing down. On the hills, lots of free juice. They also put electronic controls on the air compressor for this same benefit. They have proven this works, the question is, can something like this benefit us in a retrofit situation?
Jon Kabbe
1993 coach 337 with Civic towed