Inverter/Charger relay

As explained elsewhere in this article set, after an equipment failure I decided to replace a combination inverter/charger unit with individual components that fill the same needs. The combination unit (the `Everything Box`) is an efficient way to save costs by combining certain electronic functions and sharing hardware, but if it should fail, all

its functions are lost at once. Mine failed, and I decided I would like to avoid repeating that experience. Here is a block diagram of my solution: Most of this system can be put together from off-the-shelf components, in fact, everything except the line/inverter relay box, which it seems must be built from scratch. Here is a diagram of my line/inverter relay box, able to switch 30 amps and perhaps a bit overdesigned for the average small boat: The basic idea of this circuit is that activating the house-power inverter causes the relay to switch from shore power to inverter power. This box is wired into the boat`s breaker panel in such a way that only those loads that need inverter power are connected to it ” for example, a select number of outlets serving computers and video equipment, but not high-power equipment like microwaves (unless you buy a very large inverter and have a huge battery bank) and certainly not loads like the battery charger, which should always be connected to shore power. Don`t consider simplifying this circuit by eliminating the neutral wiring ” in modern house wiring, the neutral lines must always be switched along with the hot lines, among other reasons to allow GFI outlets to function as they should. In fact, the barrier strip with #6 hardware was a mistake, and if I were to do this over again, I would get a bigger size ” like #8 hardware ” because the existing terminals didn`t easily fit on this...

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