hi mate
i have ev100 fitted on my boat with old st4000 wheel drive .
my last sail the old wheel drive did not like it.
it had been fine for 6 months in lighter conditions but when the wind picked up and the sea state increased it was sending a drive unit failure message saying it had stopped working what a pain in the arse that was.
not sure if motor was old and tired or the old cable was 10amp and new install calls for 15 amp cable i havent been able to look at it yet to determine fault but the lesson here is replace ALL THE OLD WITH NEW.