(no title)
ww520 | 1 month ago
It's very popular in Germany, with several million units installed. They call it balcony solar panel. People hang the panels on their balconies in apartment buildings. Germany allows up to 800-watt systems.
It's a very simple system, a solar panel coupled with a micro inverter that converts DC to AC power. It is plugged into a regular wall outlet to provide additional power to the home. The added power is an additional source of electricity in addition to the grid. Any electrical devices drawing power from the circuit draw from the closet source first (due to Kirchhoff's Law), i.e. from the solar panel, then any additional need will be drawn from the farther away grid.
The micro inverter needs to be UL 16741 compliant for anti-islanding protection, to shut off in case the grid has shut power down, so that the solar panel won't back feed power into the grid.
In U.S., Utah has already passed a law to allow plug-in solar systems for up to 1200 watts without permit requirement and allowing back-feed into the grid. A few other states are considering.
There are limits to the power fed into a circuit. Normal household electrical wire can handle up to 15amp (1800 watts on 120V) of electric load. The plug-in power from the solar panels should not exceed the limit. This means the power generated is meant to supplement the household power need rather than completely covering it. Any reduction from the grid helps.
I talked to my city's (in California) building department. They haven't heard of it and need time to do research. The building inspector says that as long as the solar panels are not modifying the structure of the building (on roof or on wall), they don't care. They said putting the panels on the ground in the yard is fine.
throwaway81523|1 month ago
That's swell if you have a balcony facing the sun and enough space for 4m2 of solar without blocking your neighbors' sun. In my unit for example, it's completely infeasible.
sgerenser|1 month ago