12 volt x 10 for motorhomes

[southtoms]

12 volt modules, that trigger 12 volt lights and other things

[Dan Lawrence]

Sorry, X10 isn't interested.  X10 was designed from the very first time to be powerline based.

[Noam]

The X10 technology relies on the zero crossing of the 120V/60Hz (or 240V/50Hz overseas) AC power to transmit signals over the power lines. There is no simple way to adapt the technology to work on 12V DC power.
I did a quick search, and you can buy remote-controlled 12V switches on Amazon (and plenty of other places). They are designed for turning on and off motorhome lights using a keychain remote.

[Tuicemen]

Most motor homes now are capable of 110 volt using a inverter to convert 12 vot to 110.
It is possible to use X10 with a Pure Sinwave inverter.

[dave w]

12 volt modules, that trigger 12 volt lights and other things

Yep, good suggestion but not one X10 will pick up.
FWIW I used X10 in a motorhome, while on shore power and on generator (7.5 kW Onan so was very clean). Was fun to be able to turn on the electric blanket from the steering wheel  .

There are a number of 12V remote control switches with multiple outputs controlled by a RF remote...ain't X10 but would get you close.
http://cgi.ebay.com/TEN-Universal-Wireless-12V-Remote-Control-Switch-8-CH-/250636195324?_trksid=p4340.m263&_trkparms=algo%3DSIC%26its%3DI%252BC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%26otn%3D15%26pmod%3D380077506395%26ps%3D63%26clkid%3D9014443894536265303

[HA Dave]

These can be useful as well:  http://www.geeks.com/details.asp?invtid=RM01&cpc=SCH

[luke03]

What would be the ambient current for X10 devices?
12VDC does not have the zero crossing timing signal for X10 protocol actually working. So it is not likely to have any native X10 control device directly operate on 12VDC.  Also the X10 device consumes a little power to have its receiver watching over the wire. Many battery powered setup may not like to have the extra power consumption.

[Brian H]

Most X10 modules use a capacitor on the input to act as a current limiter for the electronics. DC would probably be zero current as it blocked by the capacitor.
As you said. No Zero Crossing to time everything to anyway.