I've never seen a ride on mower tensioning system, but it seems like a disengaged belt would have quite a lot of friction rubbing against it's guides? As a guess a ride on mower is designed to only be moved short distances with the blade disengaged, it's primarily designed for mowing with the belts tensioned. I wonder if extended use of the alternator disconnect would lead to quickly worn belts.
How much energy does a mechanical diesel need anyway? With so much roof space on a suburban it seems like a perfect candidate for some flexible solar panels. Before you say 'glow plugs', they're only needed on a cold start when the panels would have had time to fully top up the batteries. Of course if you do a lot of night driving it might be less attractive.
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