HomeMade UPS - Do It YOURSELF!!!
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just a peice of art, many thanks for you.
AlaeddineTube 1 month ago
Actually problem is that All those gadgets seperately costs more than simple UPS. And it doesn't protect from undervoltage and overvoltage.
udajs 1 month ago
@abyssunderground This is because relay breaks circuit for milisecond or less and for some devices that can be enough. Power adapter holds voltage for some time (there are capacitors inside) and menwhile relay jumps to battery suply. I you want some UPS for light sources you cam make it more simple, just using manual switch.
udajs 1 month ago
Nice idea, I was planning to do this myself. My only question is why do you convert from 220, to 12v then back to 220 again? You could skip this and go straight from mains power via the relay (or a pair if required). This reduces losses associated with 220 > 12 > 220v conversion (which is significant). If the mains fails, the relay flips over to the other side and current from the inverter flows instead.
The only down side - you would need the inverter always running, with a charger connected.
abyssunderground 4 months ago