So basically, you can carry: - FlexSolar 40W panel: 1.35kg - Nitecore NB20000 ~75Wh battery: 300g - Starlink Mini: 1.1kg - Smartphone: 250g For 3kg you have something that should give 2-3 hours of Internet usage on an average EU/USA good weather day (assuming 20% solar panel for 10 hours = 80Wh/day, 25-35W power usage of Starlink Mini + smartphone). For each extra 1.65kg you get an additional 2-3 hours, resulting in…
BTW, their specs says it wants minimum 100W USB PD, so you'll actually need a different battery that can do that which is probably going to be heavier (the NB20000 tops out at 45W), assuming that's accurate. The 630g Anker 737 PowerCore 24K might be a good option, and also the 765g HyperJuice 245W. So this adds 0.3-0.45kg to the estimate.
But yeah, options like the Anker 737 24K should work great (which supports 20V/5A and 28V/5A). I happened to pick up a few of the 737s recently, so I'll be curious to try them out with the Mini soon. Just waiting for Starlink to actually add the usb-c to DC barrel adapter to the online shop.