The only question that this leaves me with is how to adequately protect the 12VDC circuit against all the things that the regular 240VAC circuits are protected from: ground leakage and short circuit. But this is the matter of a small Google search: there are, of course, quite a few circuit breakers for 12VDC systems. There's even a thread on the Home Owner's Chat forums to the effect that some modern AC circuit breakers are also rated for DC operation. Maybe not the same rating, however, because there's a difference between the RMS power of AC and the direct power of DC. If all else fails, I can probably find a suitably high-rated fuse pack for a car and use that.
There's even plenty of discussion on the question of wiring. The key observation is that there's more of an issue with voltage sag over household distances, but I'm still trying to determine the DC rating of standard 240VAC home wiring. The estimates I've made show that American Wire Gauge 12-14 is considered 'standard' for their 110VAC circuits, so we're probably using AWG 8-10 - for those who prefer metric, that's a cross-sectional conductor diameter of about 3.26 - 2.59 mm. There's a handy voltage sag calculator on-line. It'd be kind of useful to be able to use standard wire sizes, although I think I'd probably spray-paint mine some recognisable colour to indicate which lines were DC and which AC. Helps stop those annoying destruction of costly appliance moments...
Last updated: | path: tech | permanent link to this entry
All posts licensed under the CC-BY-NC license. Author Paul Wayper.
Main index
/ tbfw/
- © 2004-2023
Paul Wayper
Valid HTML5