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We had the same thing happen to our Heart 2500 last December which, at the
time, was about 5 years old. It was a relay and the entire board was
replaced. Another board had a lot of corrosion which was also replaced --
about $500.
The "factory" service guy told me that the cause was plugging and unplugging
the shore cord when there was a big load on it causing the relay to arc.
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I have had the same problem a couple of times; my inverter guru told me
essentially the same thing; but also told me to take all possible AC loads off as
well as DC loads before switching over in either direction; that is from
generator or shore power to invert; and vice vera;
Here's the problem: every time you switch over there is an arc at the relay;
if you are running a 30 amp load when you switch over that's a 30 amp arc;
no small thing.
The other thing is that the relays currently being used are not as robust as
those of 10 years or so ago; they have cheapened them up and they just don't
have the good plating that they used to have.
So now I just have made it a habit to switch off loads and then go to invert
or the other way; same with the battery charger function as it can be
independently switched with the Link 1000.
When it starts to take a while for the inverter to switch over; it's time to
see what the balance is in the check book because I think that's when the
relays are telling you that you hit them too hard too many times.
JOHN HOUTS
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