Re: Need help sizing a panel to run router/modem for extended blackouts.
You might look to see if you can run your modem/router/lap top on native 12 vdc rather than using an inverter. It might not be worth the effort, since using a Suresine 300 inverter is pretty darn efficient. We run a VoIP. Unit, cell modem/router nearly all the time, turning it off at night. One trick, charge (and use ) the lap tops while the sun is out, since they are the biggest draw. Time shifting the loads can have a considerable increase in EF.
Please note, being a moderator does not add any weight to my opinions 300 watts Siemens/BP panels,plus a Sun 90,, making ~400. ~30 amps into Rogue MPT-3024, 450 ah of Trojan T-105, Morningstar ts300 inverter, a Tri-Metric meter.a collection of antique generators, plus 2 Honda eu-1000i's (also a BS2512 IX controller) and assorted other stuff!