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Planning to build battery backup for raspberry pi zero w that last for days from 12v lead acid PC ups battery.

Parts

PC UPS, https://www.youtube.com/watch?v=-Ur-D37-juo

LM7805, https://www.ebay.in/itm/263163136739?aff_source=hcurve

DC to DC Buck convertor, https://www.ebay.in/itm/6-24V-12V-24V-to-5V-3A-CAR-USB-Charger-Module-DC-Buck-step-down-Converter/182672596411?hash=item2a88229dbb:g:BB8AAOSw5cNYcEeC

Setup

PC UPS 12v Lead acid battery->LM7805->Raspberry Pi zero micro usb.

Questions

Any chance for a problem while charging PC ups? Will it overload/overheat LM7805?

12v DC to 5v DC USB buck converter vs LM7805. Which one is better for pi zero?

Is it possible to use another LM7805 from the 12v battery parallel to run another raspberry pi zero?

  • it is unclear what your question is.. A linear regulator is a poor choice.. 70% of your power will be converted to heat and you will need a large heatsink. – Milliways Mar 15 '18 at 9:27
  • This isn't really a Pi specific question. You could be powering any similar device. I'd use the most efficient converter so there is less wasted heat. That is probably going to be the buck converter. – joan Mar 15 '18 at 9:29
  • if you have an existing UPS why not just plug a regular PI power supply into it. – Steve Robillard Mar 15 '18 at 9:44
  • @SteveRobillard I think regular PI power supply will drain ups bettery power faster. Want to use pi in battery for minimum of 2 days. – Mcore8x Mar 15 '18 at 10:02
  • @joan Thanks, Heating is really a concern. I'll try with buck converter. – Mcore8x Mar 15 '18 at 10:04

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