Your load may have a limited voltage tolerance (e.g. +/-10%) on its 5V input, in which case you will need to take great care to minimise voltage drop on the 5 volt side. So @xevilstar1 is setting you on the right track there. Unless your load can tolerate a short break (10-100ms) in input voltage, when a relay might be a suitable option.Hello,
I would like to connect two usb (portable, each already regulated) battery packs to one 5v 2A load.
I'd like to do so that when one battery is empty it gets disconnected from the load and gets connected to the solar panel, the other with full charge will be connected to the load, it has to happen as seamlessly as possible. How would you do it ? with some kind of switch or relay? have you got an idea of pcb schematics to realize that ?
If your battery packs have a control input allowing them to be switched on and off, you could simply combine their outputs using two 'perfect diode' circuits.
A totally different option, which may not work for you, is to manage the batteries at a higher voltage (where voltage drops are less critical, and currents are less). Then use a small step-down converter to generate the regulated output voltage.
Statistics: Posted by stevend — Mon Jan 01, 2024 9:58 am
