On Sat, Mar 05, 2011 at 07:33:59PM -0600, [email protected] wrote:
>
> I forgot to answer your question.
>
> How about a relay operated by the output of the inverter that would unpower
> the shore power cord. But that would use coil power whenever your inverter
> was on.
It would also be trying to lift itself by its bootstraps. :) I.e., if
the shore power was already on and I switched the inverter on, it would
have to fully come up to power the relay... whoops. :)
> How about a relay that only connects the shore power cable to the boat (and
> disconnects the inverter) when shore power is available.
> Maybe connect the relay (a DPDT type) coil to the shore power cable and the
> NO contacts, the boat to the moving contacts and the inverter to the NC
> contacts.
I'd thought about that; I think that's the best and simplest approach.
--------------------->
| To ship's AC
| ------------------->
| |
>-------------.-----o | o==>o---------------<
Shore power | NO \ NC Inverter
>-------------|-.---o o==>o---------------<
| |
| |____mmmmmm_
|_____________|
This would have the inverter output going through the normally-closed
(NC) pair, so there's no standby current draw at the relay. Whenever I
plugged in shore power, it wouldn't get connected to the system until
the relay flipped - at which point, the inverter would be out of the
circuit. If the inverter is on and the shore power is off, the shore
plug is out of the circuit, and thus no juice coming out of it.
Given that a 20A 120V DPDT relay is only about $15 at Digi-Key, I
suppose I ought to add that to my (huge) list of projects. :)
Thanks, Norm!
Ben
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