On 17/10/2019 2:00 PM, Mitch Haley via Mercedes wrote:
It sounds like some of the early grid-tie inverters of 20-30 years ago.
You need panels, battery, and a current sink (like a BIG tank of water with a
resistance heater). Power from the panels went to household loads, then to the
battery, then down the sink or, if you hit the sell button, onto the grid.
In "guerilla solar" (unpermitted) installations, the meter ran backwards in
sell mode, something you didn't want to be happening when the meter reader came along. In
simple guerilla setups you left out the battery and current dump, and just ran all the
excess onto the grid. All the inverters on the market had appropriate shutdown when the
grid went unstable.
Looking back on it, I think the dump was needed for wind turbines, not solar
panels. Solar-only charge controllers just let the solar go open circuit if the
power was unwanted.
Mitch.
One would think that a wind turbine could do the same. Just need an auto
clutch to disconnect from the charging unit when power was not wanted.
Randy
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