Bypass diode replacement shuts down solar panel hot spots
Whether it’s a residential installation with a rooftop full of solar panels, or a utility solar farm with thousands of them, solar panels are rarely found in single configurations. These arrays need protection from panel failures or shading; otherwise you’ve got about 8-12A in a string of panels with nowhere to go.
Panels traditionally rely on a simple bypass diode to shunt current around a failed panel. STMicro has introduced a more sophisticated controller switch SIP (system in package) that replaces the bypass diode with a more intelligent device. The SPV1001 contains a low-loss power switch and a precision controller and eliminates almost all of the energy lost in each diode when the panel is producing energy and the diode is in its off state. For example, reverse leakage current (40V Vr) is 1 µA at 25°C and 20 µA at 125°C. The forward voltage drop at IF = 8A is 70mV and 160mV, respectively.
The device consists of a power MOS transistor that charges a capacitor during the OFF time and drives its gate during the ON time with the charge previously stored in the capacitor. ON and OFF times are set to reduce the average voltage drop across the drain and source terminals and thus their power dissipation. Depending on the package the price is about $3.00 (1,000).
Misheck commented:
the fallacy to me is that a prsoen with a black would not bother with self examination of something they believe to be dead. If a prsoen does not believe in sin than they feel free of the "stain" of original sin and could not believe in a black If you told me that I would probably tackle you in a good way I mean.
Drop commented:
Diode voltage drop to me has never been acceptable. This is much better.
