I've heard different resistive values for the signal pin tossed around (47K above, 3.9K elsewhere), but in the interests of making this crazy-simple... assuming we trust the 24V supply, could the "signal" lead be handled by a simple resistor splitter feeding a "sense" resistor? I'm more hacker than ...

Thanks for the information... do you have the link to the apnea board posting regarding prototype? Also, was this attempted by people who have electronic knowledge, or folks just hacking at it? From what I can tell it strongly looks like it's a simple voltage splitter to represent supply capacity, b...

FYI, for other crazy people wanting to experiment with DIY 12V to 24V adapter: $2.64 delivered, 150W boost converter: http://www.aliexpress.com/item/150W-DC-DC-Boost-Converter-10-32V-to-12-35V-6A-Step-Up-Voltage-Charger-Power/32650647286.html $3.99 delivered, 100W boost converter with LED voltage di...

A little shopping may have answered my original question... ResMed actually sells a 150W MSW inverter for use with their own 12V lithium battery packs ($60 for the same inverter I get for $7... ahem!). They caution that the battery life will suck, but that it's fine to use their battery with their i...

Right. It doesn't work - its not HP style, its a proprietary plug that identifies how much power can be supplied. I'm sure I can replicate whatever it's doing, but extra signalling/voltage splits complicates things a little bit more... :-s I'm guessing you mean 200 Amp-hours, not milli-amp-hours! W...