The risk isn't usually the device you connect a bad cable to (they have internal limiters), it's the cable itself. You can easily overload a cable if the extension cord can't signal the lower limit if it's own rating and the other cable's rating.
The USB 2 part is also misleading.
Chaining regular extension cords isn't a problem by itself, connecting too many things in parallel and exceeding the rated max is a problem (and chaining extension cords "just" increase the risk that ordinary people will decide to connect more than they should, especially because the lowest rated cable in the chain sets the total limit)
That's an active extension cable, which is essentially a single port USB hub.
Lockdown mode takes very expensive equipment to bypass
When you reboot, the user data encryption key is flushed from memory, and your unlock code is necessary to decrypt the KEK (key encryption key) held by the TPM / SE chip (which also applies rate limiting). All common attacks on unpowered devices are bruteforce with rate limit bypass.
In lockdown mode the KEK stays in memory so app state and user data is there, but the CPU is in a state which prevents access to it until unlocked with your code. There's a few more attacks possible, but most are completely blocked by the fact that USB data connectivity is also disabled in this state. You practically have to open up the device to pull data out.
Tldr no ordinary thief will even try.
The bigger risk is having it stolen while unlocked. Make sure you have revocation options ready for keys held on the device
Solar panels don't generate constant power! That's why it's wrong because you'll get wrong numbers. You can't assume you'll get peak output continously.
You *** must *** calculate incoming and absorbed light. The Watt output will vary continously as the sun moves and weather changes. If you have average kWh / day stats and a battery solution that can store a day of battery, THEN you can calculate average Watts if weather doesn't change too much.
Yeah, solar panels put out power in proportion to the light that hits it and its efficiency. The latter is in the specs but the former requires knowing how it will be installed before you can determine expected output.
Some calculators can also consider weather predictions (cloudy days, etc)
Some calculator sites;
The phone pulls carrier specific settings based on SIM card carrier data. Apple allows the carrier to set a hotspot block
They'll usually let you bring you own hardware. As long as you buy one that is not carrier locked it will work (if you're buying it in a store, ask the staff to be sure it's unlocked)
If your old SIM card doesn't fit you might have to ask your carrier to send a new one, or you can ask for eSIM setup (log into your carrier account, scan a Qr code)
To be fair cryptography can make a lot of that kind of private data inaccessible
But still, this particular project is stupid and being able to use just biometrics for access is idiotic. Generating secret keys from data that is fully exposed to the public is extremely moronic.
Biometric scanners only protect against lazy attackers, unless you literally have an armed guard next to the scanner to enforce correct scans without shenanigans
That's just rephrasing what I said. You can plug in too much for a single extension cord even if there's no chaining. A chain "just" increase the risk.