Space Blaster MP - power consumption calculations

[Youkai]

I have the schematic for my project locked down now (I think). Time to start figuring out power consumption. This isn't something I've done before and I'm having trouble getting some of the numbers. Also I don't know what to do with the numbers once I have them. Please review below and provide any assistance you can. Thank you!

• HS-55 x5: 2000mA - 5.5mA idle, 150mA no load, 450mA stall, using 400 x 5 as the value
• HS-311: 600mA - 7.7mA idle, 180mA no load, 800mA stall
• DF Player Mini: 30mA - 30mA this doesn't seem right based on things I read about this using a lot of power
• DotStar x10: 600mA - 60mA. Assuming full white of 10 active LED as the average.
• Speaker: ?? - No idea. 8ohm 1watt
• XL4015 Buck x2: ?? - No idea. 95% conversion efficiency
• Switches: ?? - close enough to 0 that I can round to that?
• Capacitors: ?? - close enough to 0 that I can round to that?

Once I get current draw for the remaining items what do I do with the numbers? Do i just sum them up and multiply by my desired run time then find a batter with that many amp-hours? E.g. if the total was 5000mA, and I wanted it to run for 2 hours I'd get a 10 amp-hour battery?

I'm hoping I can find a USB power bank that's small enough, and meets the power needs. If I find one, I should be able to strip one end of a USB cable and use that to power the circuit: correct?

[orb]

XL4015 Buck x2: ?? - No idea. 95% conversion efficiency

I know, it's an old thread. It looks good in the data sheet, but it is not exactly 95% for each in-out V. For example (XL4015E1 @ 1A load):

12V -> 3.3V = ~71%
12V -> 5V = ~74,8%
20,3V -> 3.3V = ~61%
20,3V -> 5V = ~68,2%

[Youkai]

Hey thanks for the reply. I ended up using an old USB phone charger that I had in a drawer. The whole thing seemed to work fine off of a 5v USB plug. Yay for that.