Theoretical battery power supply question

The unit is rated for 280WH (Watt Hours), which means it can power 1 Watt for 280hrs.

83 Watts for 3.37 hrs (280/83)  assuming 100% efficiency.  However, the FAQ on your URL seems to indicate 85% efficiency in their example. In which case: 238/83 = 2.86hrs. 

• Q2: How to calculate the working times for your device?
• A: Working time = 280Wh*0.85 / operate power of your device. For reference, assuming power consumption of your device is 30W, working time will be 280Wh*0.85 /30W = 7.93 hrs (rough calculated).

21 watts all in for my most "listened to" system. <30 hours play for me.

My battery stays on the sump pimp.

@rhg3 Yup, I used the same calculation and if I pursued this I’d go with their 500W version that’d get me 7+ hours of use.  But at only $175 I might try the 300W version just with my $400 streamer and see what sonic benefits I get, if any.  Plus, if it blows up I’m not out all that much and gives me an excuse to upgrade my streamer — heh heh.  I’ll follow up if I decide to roll the dice.

@carlsbad 

Speaking of ‘pure sine wave’ ; I once looked at Isotek system. I was fascinating by their whole system holistic approach, the estimated cost was $14K to treat 5 components. In their ultimate approach, each component is fed by its own sine wave + power conditioner upstream.  I often wonder about what’s that experience going be like! 

I can speak from personal experience. I have and have used a Goalzero Yeti 1250 lead acid battery to power my system. I use it when I want the ultimate listening experience. I have written about this experience on this forum before. Think of it as a gigantic 100 lb. car battery. That's basically what it is.

My main comment is that it drops the noise floor. I listen in my basement where my baseline noise level averages below 20 dB so my environment is pretty quiet. I didn’t know I had a noise floor in my system, but the Yet 1250 somehow eliminates noise from my preamp and amplifiers. It puts out a perfect 60 Hz sine wave. I’m not an electrician but it’s made me wonder if it helps the preamp and amp to be on the exact same frequency. I don’t know. I just know it works.

The reason I don’t use it all the time is because it does eventually lose enough power that it won’t run the system. And my system is already on a dedicated line that sounds pretty good.