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I believe the zap-stop is to remove spikes on the excitation input to
the alternator by shunting them to ground. The fuse is there in case
the diode shorts in which case you would otherwise have +12 connected
to ground..

See, that's the problem with this Zap-stop. A lot of people saying what they
believe it will do for them. Technical data at the Xantrex site is darn
slim, so wishful speculation abounds.

Extraordinary claims demand extraordinary proof. I wanna see a schematic, I
wanna see suppressed transient waveforms, show me why Zap-stop is better
than a zener or MOV or SiC or Transorb or a gas tube!


Ed