[mpnex]

UL is a certification body, yes.

When the local building code requires that grid-connected devices are UL listed, then it becomes a legal requirement. I suspect this is probably the case in most jurisdictions across the US.

edit: NEC section 110.2 indicates all equipment must be "approved" and delegates this to the Authority Having Jurisdiction (AHJ) locally; and the majority of them are going to defer to a "NRTL" (Nominally Recognized Testing Laboratory, such as UL, CSA, ETL, etc) instead of doing all the expensive and tedious testing themselves. So when it comes to grid connections, some sort of approval is nearly always a de facto legal requirement.

[lazide]

Mobile installations (RV’s, construction trailers, etc.) and off grid are two very common types of installations for solar inverters. And do not have to meet those requirements.

[seany]

There are _many_ ways that all of this doesn't apply. Nevermind the fact that people that but things have the expectation of using the device with out interference.

[anon84873628]

Let's assume there are some people using these devices in a way that is not compliant with the local codes, because they haven't met the testing/certification requirements.

Genuine question. Which of these options do we prefer? (Choose any number)

1. Deye proactively bricks all the devices

2. US governments compel Deye to brick the devices

3. Local authorities penalize people using the devices illegally

4. No one does anything