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A UPS is an Uninterruptible Power Supply that provides backup power when the main power source is lost. Questions on repairing commercial ones are generally off topic.

2 votes
1 answer
3k views

Is it possible to connect a UPS in parallel with the mains?

Short version: When a UPS is plugged in to the mains, is it possible to plug the UPS output back to the same mains? Will that work as an emergency power backup for the mains circuit? … Plus, it would be too messy with all those cords and cables going from the UPS to every device. …
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  • 479
17 votes
3 answers
98k views

Extending the backup runtime of a UPS with an external car battery

a UPS with twice as much power as you will need. … Will the UPS be able to charge the car battery considering it's way bigger than the UPS is meant to have? …
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  • 479