You also need to make sure the relays are "continuous duty". Many of the relays I have found on the shelf are labeled only for "intermittent duty". The wiring diagram is on the side of the smaller relays or on the packaging. You can also get a socket for the relay that has wiring pigtails.
Check this out:
The "smart" relay may not be the route you want to go. Yes they do cut in when the voltage is at a certain level but there is usually a delay of one to two minutes. Also to reach the cutout voltage you are actually discharging the battery to that level and again there is a delay before the relay opens the circuit once that voltage has been reached.
Here is an example:
There are other units out there, but this is the unit we use in our net control vans for charging the auxillary batteries from which we run our radios.
--- In email@example.com, "Sion Chow Q. C." <9w2qc@...> wrote:
> Thank you so much for the reply.
> I have never used these relays before. Are there any sample of how these are wired? Especially how they are physically connected to the relay terminals?
> And yes, fortunately the IC-2200 switches on when power is applied provided that it was nor switched off before power was cut.
> Thank you also for the suggestion, and I agree and might use a voltage sensing system too, but having manual control over it is still an advantage in case I need to shut down the system for some reasons.
> 73, Sion, 9M2CQC