Solar system with both grid tie-in and backup power without battery?
107320
Why do I need batteries to use solar when the grid is down?
130375
What is the simplest way to generate PWM without a Microcontroller?
137995
Powering a circuit from either USB or LIPO
89981
Can I safely connect the power-only-end of a USB-Y cable to an other power source?
138609
Can I backfeed a portable generator into my house's electrical system?
88574
Would this battery/solar powered esp32 weather station work?
15093
Is it better to use a laptop on battery or on AC power?
156077
how to switch to backup battery when power fail?
13972
Power Options: Turn off harddrive. Effective or dangerous?
28526
Power, Voltage, Current Supplies
157257
Using my idle computer for something useful (seti@home and the like)
119696
Thevenin equivalent with dependent source
103400
How can I connect two different DC power sources together?
108482
Switch power supply/battery
94014
Don't charge the battery but use connected power to run the phone
67111
Can I charge and discharge a NiCd/NiMh battery at the same time?
37729
What's a simpler way to switch between power sources?