4 ms·

I think you mean 25 grams/Watt-hour and keep in mind that you need ~12 hours of energy storage.

• teraflop 12y ago
  No, I meant grams/watt, but I glossed over how I derived those numbers. My back-of-the-envelope assumption was that you get 4 effective hours of daylight per 24 hours. Which means that for every 1W of power generation at peak, you get 1/6W of average power consumption, which translates to 3.33Wh of storage to keep things running overnight. (For a land-based installation you would probably want a multiple-day power reserve to handle cloudy days, but I'm assuming that's not an issue for a stratospheric balloon.)
  • seanflyon 12y ago
    So you mean 25 grams of battery per watt of solar panels?