During the summer, inevitably our power goes off, sometimes for days. Is there a device that you can charge up ahead of time and then use it to charge, say, your Mac off of it although you no longer have electricity?
I use a UPS (uninterruptible power supply) for my Mac. While it’s main purpose is to keep power to my Mac for brief outages and to shut it down safely otherwise, it’s essentially a big, cheap(ish), heavy battery.
I never tried charging a laptop from it, but when we had a big power outage a few years ago, I used it several times to charge my phone.
I have for example this
which I can use with the battery-packs of my Festool Battery powered Tools, to recharge our iPhones and iPads.
I also have some Battery driven lights from Bosch, I can use my Bosch-Battery-Packs with, to provide a save light source.
There is also a huge variety of dedicated battery-packs for USB Devices available, that you can also carry with you to extend the live of your iPhone during a long day.
I can not recommend these versions with solar-power, because these solar-cells are normally way to small, to really power/reload a smartphone or something like that.
I have a Goal Zero power station, and solar panel for just such situations.
I have the 1500X model. I used it to keep my refrigerator running for several days, after a lightning strike that took out the power. I used the solar panel to keep it charging.
I have UPSes on all the devices I don’t want to reboot during a short outage. The house has a backup generator for longer power outages. It takes about a minute for the backup generator to provide power so I need the desktop computers and networking gear to stay powered up. I have 4 UPSes in the house.
no battery – it’s for charging devices in a sunny place;
it works best with full direct sun;
it still charges on somewhat overcast days, but slooowly.
Best use cases: camping, tail-gating, maybe boating (tho not waterproof) – anywhere you have an unobstructed sky and can point the thing more or less at the sun, and aren’t moving around.