I recently put a TV & Blu-ray in my camper but went a different route in powering both units. I purchased a small deep cycle 35 amp battery along with a 200 watt dc/ac inverter. The combined amp draw is about 3-4 amps per hour, so I'm good for about 6-8 movies before having to recharge the battery. I did this so as not to draw from the main battery. Also, I too have to use a CPAP & I have a another seperate 35 amp battery that runs it using the DC power cord that came with it, no inverter neccessary. Once again same reason, no draw from the coach battery. Bought the batteries for $50 each & the 200 watt inverter for $23 on Ebay. If I'm dry camping & need to charge either of the two auxilary batteries I simply start my generator & use a battery charger.