How does panel shut-off work for emergency responders? Where I live, a solar energy system is required to have a shut off switch. For example, my system has a big red handle mounted on the side of the house. This is important not just for first responders like firefighters but also for linemen repairing downed lines, which are pretty common where I live (a mountainous rural area).
Given that these store-bought panels are being plugged into house AC, it follows that they have built-in inverters. Many grid-tied inverters are “grid follow”, meaning that they adjust themselves to grid frequency/phase. So, just speculating here… maybe the inverter senses when the mains go down and turns itself off? I would love to know from an EE what is actually happening wrt safety.
It'll be the same as larger inverters for roof-top solar - they are constantly monitoring the mains cycle and will shut off if the voltage (or probably frequency too?) goes out of range, let alone drops out entirely. The relevant standards in the UK are G98/G99.
Not necessarily, but most inverters (in Europe, at least) aren't designed to function without a grid anyway.
Some models of inverter brands like Victron (which isn't very common outside its niche of self-sufficiency because they are rather expensive and sometimes complex) can form a micro-grid. They have the option of a special circuit breaker [1] that decouples the inverter from the grid if the grid is detected to be down, which allows their use during a power outage.
I have two left hands (and one of them is backwards) and components spontaneously disintegrate when I touch them. I know I'm not capable of building a computer so I bought mine from Tuxedo computers, who sell computers running GNU/Linux. I might be the GNU/Linux whisperer who manages to not have any major issues, but that doesn't correlate with the type of technical aptitude which would let me turn a heap of components into a working machine. I even managed to break a laptop by trying to replace the CMOS battery.
Making any hardware changes whatsoever to a laptop is dramatically more complicated than building a desktop. It very much is just a matter of 1) buying compatible parts (there are websites for this, or if you shop in person they'll be more than happy to help), then 2) matching plug labeled A to socket labeled A.
Hah! You're like one of my family members. We keep her away from anything electronic because the failure rate in her presence can not be accounted for by accident alone.
Oh, and laptops are nasty. They are put together in ways that can easily confound you when you have plenty of experience. Lots of it revolves around little pieces of plastic that are marginal when new and that just want to break by the time the device needs service. It's a conspiracy!
Anyway, at least you know it can be done. The conditional still holds.
I tend to agree but I think the strategy here is to convert people who stubbornly cling to gas vehicles because EVs somehow defy their expectations. I have been approached many times at highway rest stops by people who are curious and slightly skeptical about the EV value proposition. They see me hanging around the vehicle for a half hour and think “ugh, no thanks” as if that’s all I do when I travel. What they’re not seeing is that I rarely use public chargers at all, because 99% of my charging is done either at home or at the charger in the parking lot at work. It’s really just road trips. Not to mention, if you’re an ICE owner hanging around long enough at a rest stops to notice that I’m hanging around, are you really that much faster on a road trip?!!
Back on topic, I am ok with losing a little efficiency in the fast charging process if it means that more people switch away from a horribly inefficient and polluting technology.
Many are made in Canada [1]. I remember traveling to Quebec in the early 2000s and being surprised to see more people driving Fords than back home in the US.
I suspect part of BYD’s strategy is to get a foothold in the North American free trade zone. Maybe they won’t be able to export to the US at first. But if I recall correctly, an import US legal principle is that laws/tariffs cannot discriminate against a single company (excluding for national security). So BYD will simply iterate toward a design that satisfies US regulators. I am not familiar with Canadian safety regulations but I would be surprised if they were dramatically different. Unless American car manufacturers can find it in their hearts to sell an affordable car, this is an existential threat.
Unfortunately, a corrupt autocracy with a strategy seems more likely to win the capitalist arms race than a wealthy but feckless democracy. It’s only slightly ironic that said autocracy calls itself communist.
Functioning democracies are inherently authoritarian. The simplistic, textbook definition of dictatorship, which in the West is generally used to define the foreign other, has no basis in reality.
This vision holds because it presupposes that the only thing people care about is political freedom, when in reality there can only ever be one political class and political freedom is largely about some other political class trying to take control because the current system doesn't favour them in some way.
Western democracies, at their worst, have a largely permanent political class who is elected every year under the pretext of democratic legitimacy. Eastern dictatorshpis, at their best, have a government that is continuously rotated to ensure competent implementation gaining legitimacy from delivery.
Both are contextual and the position along the autocracy axis largely depends on implementation. Whether people can actually vote is irrelevant (Europe is generally one of the worst examples of this, elections constantly, most election produce governments that polls under 20% within months...it is very strange that people call this democracy).
Given that these store-bought panels are being plugged into house AC, it follows that they have built-in inverters. Many grid-tied inverters are “grid follow”, meaning that they adjust themselves to grid frequency/phase. So, just speculating here… maybe the inverter senses when the mains go down and turns itself off? I would love to know from an EE what is actually happening wrt safety.
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