Hi,
For a small UPS back up like this one:
Amazon.com: CyberPower ST425 Standby UPS System, 425VA/260W, 8 Outlets, Compact: Electronics
How long would it run for using a 5v iphone charger to a 5V 400mA DC motor?
I don’t know the inverter efficiency.
For a small UPS back up like this one:
Amazon.com: CyberPower ST425 Standby UPS System, 425VA/260W, 8 Outlets, Compact: Electronics
How long would it run for using a 5v iphone charger to a 5V 400mA DC motor?
I don’t know the inverter efficiency.
> how long would it run ....a 5V 400mA DC motor?
Why convert voltage multiple times? And after the battery?
USB "batteries" are called USB Power Bank.
Amazon.com: 26800mAh Power Bank Battery Pack
16750mAh - $19.99
That's 40 hours for 20 bucks.
If you need all-week runtime, buy five and change them as they go flat.
Yes, the mini-UPS does look cheaper. And bulkier, and UPSes have a habit of over-rating and under-performing.
Why convert voltage multiple times? And after the battery?
USB "batteries" are called USB Power Bank.
Amazon.com: 26800mAh Power Bank Battery Pack
16750mAh - $19.99
That's 40 hours for 20 bucks.
If you need all-week runtime, buy five and change them as they go flat.
Yes, the mini-UPS does look cheaper. And bulkier, and UPSes have a habit of over-rating and under-performing.
Thanks.
Yes, I was considering to power directly from battery. Just don’t have time to buy and build a back up circuit when power fails. I know I could use NO/NC relay for this. Also need some continuous charging circuit for the battery.
UPS has the convenience of keeping the battery charged, switches when power is out at the expense of the inverter power usage.
Yes, I was considering to power directly from battery. Just don’t have time to buy and build a back up circuit when power fails. I know I could use NO/NC relay for this. Also need some continuous charging circuit for the battery.
UPS has the convenience of keeping the battery charged, switches when power is out at the expense of the inverter power usage.