The updated version of the website that started the blog states that there is a 300W maximum load on this mod. They are using 5 amp SSR’s in many of their mods except the hot water heater mod, where he used a 50 amp.

I’ll keep my UL rated relays that control my 480W of incandescent recessed lighting and my 600W transformer (9 amp draw). At least we didn’t start talking about dimmer loads too.

Here’s the updated site for X-10 mods.

http://idobartana.com/hakb/index.htm

Furthermore, unlike conventional relays, SSRs won’t fail after N switchings (due to mechanical wear and that it arcs inside the relay every single time you switch with a load). It’s pretty clear to me that the X10 guys used conventional relays because they cost 1/10th as much (and 1/3rd as much as the home-built SSR here), nothing more.

the X10 modules are for outlets. I dont play with x10 at all so maybe they make some for hardwiring, but I dont know. My questions is what kind of light with a standard plug on it would require 600w, as the article shows how to modify a x10 module for a standard electrical outlet.

e.g. Multiple recessed lighting like kitchens and living rooms have a cumulative load. Exterior house lighting like spot lights, two on each unit 2 to 4 units adds up.

It’s the same for dimmers. If you want to dim 6 recessed fixtures that have 100W bulbs you would need a 600W dimmer.

As far as safety is concerned a solid state relay is a lot more safe in my opinion, given its rated to handle it load obviously. The spark a mechanical relay causes could lead to more problems than a SSR. Further more after extended use of a mech relay the contacts start to deteriorate(like welding). A SSR is only unsafe if not used properly, just like everything else in the world.