Adding a load to an engine in a high load state of operation will give you energy for about half the cost of the same load at idle when your efficiency is terrible. Best time to engage the compressor is when you would normally experience DFCO. Then your normally wasted inertia is doing something constructive.
If you only P&G without any constant load operation then on the pulse or DFCO are your only good options.
regards
Mech
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