A Power Bank for LattePanda ALPHA

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ccs_hello
Posts: 139
Joined: Sat Oct 13, 2018 9:16 pm

Wed Jan 02, 2019 1:22 am

I've just received a USB type-C PD 20,000 mAh powerbank from EMIGVELA ( Amazon: about $49, eBay: about $30, when it's on sale during the holidays.) Model PD-4001, internal battery capacity 74 Wh.

Tested it on LP Alpha 864 (with an eDP monitor also as a load.) With low/medium load (some basic benchmark occasionally, graphics bench, or idle in the mix), I saw the pack's fuel gauge dropped from 95% to 21% in about 3 hr 30min. Thru my meter, output voltage maintained around 14.6V (about 1.1A under load) and 14.8V at 0.7A (idle). During maximum I saw current consumption went as high as 1.9A. My meter showed power consumed as about 40 Watts-hour in this experiment.

It is a 45W PD 2.0 unit and at 15V output setting, max. current is 3A (but I did not have a load that high in my test set up.)

Its type-C port serves as either power sourcing or sinking (means being charged from a AC-DC type-C power adapter.)
This means that it cannot be used as a power-path module (i.e., poorman's UPS.)

I used my personal fund to purchase this unit and received no compensation from any.
Opinion is just my own and
naturally as Internet based purchase, it's always YMMV.

If there is any update, I will add info at later time.

ccs_hello

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LattePanda
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Posts: 2336
Joined: Wed Jan 20, 2016 9:09 am

Mon Jan 07, 2019 11:03 am

This is cool. Would you mind that I combine this post on our official docs to share your testing and suggestions to all backers?
Look forward to your reply!

Link - http://docs.lattepanda.com/content/alph ... ower-banks
Enjoy Tinkering with LattePanda ! :lol:

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ccs_hello
Posts: 139
Joined: Sat Oct 13, 2018 9:16 pm

Mon Jan 07, 2019 3:12 pm

@ LP

Sure. No problems.
IMO, showing PD output wattage is not an assured indication that it is a right fit.
E.g., a type-C PD power adapter/powerbank may show combined port power, say 2 port unit add two ports' values together to show how "powerful" it is.

A specific type-C port's output rating is the key.
For example (thru PD protocol sniffer/analyzer), I checked one of my type-C PD power adapter supports the following spec:
5.00V 3A
9.00V 3A
10.00V 3A
12.00V 3A
15.00V 3A
20.00V 2.25A
(When it connects to LP Alpha providing power, they negotiated to 15V 3A mode.)

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LattePanda
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Posts: 2336
Joined: Wed Jan 20, 2016 9:09 am

Mon Jan 07, 2019 3:29 pm

Docs updated. Hope it's helpful for more users, who is choosing the right power source for LPA. ;)
Thanks for your sharing and details!
Enjoy Tinkering with LattePanda ! :lol:

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