Can I run an electronic piano using a power bank?

Question

I have a Yamaha P-140 electronic piano. Looking at its power adapter, I see the following info:

Input: 230V~ 50Hz 170mA
Output: 12V (strange symbol here, something like an equal sign =, but with dots in the lower line) 1.5A

I have a new, massive power bank with 45000mAh that I can charge laptops with, so it has a lot of adapters. And I wonder whether it could be used to run the piano as well? Its specs:

Switchable output: 12V / 3A, 16V / 3A, 20V / 3A

What do you think? To me (as an absolute newbie to this topic), the option 12V / 3A looks very close to the needed 12V / 1.5A, but maybe it would require to match perfectly? Or 3A is the max, and 1.5A would fit nicely? I really have no idea.

Welcome, questions on the usage of electronic devices are not really on topic here. We also have an established question on power adapter ratings which this will probably be closed as a duplicate of. — Chris Stratton, Mar 23 '18 at 17:29
Possible duplicate of Choosing power supply, how to get the voltage and current ratings? — Chris Stratton, Mar 23 '18 at 17:29
Just FYI, that strange looking equals sign just indicates that the output is DC. — DoxyLover, Mar 23 '18 at 18:35

score 1 · Answer 1 · answered Mar 23 '18 at 17:20

Yes, it should work. The amperage of a power supply is the max current that can be drawn, but a load will only use however much current it needs. So having a 3A power supply powering a 1.5A load will work as long as the voltages are the same. The only thing left is to make sure the polarities are the same, since the piano takes a center positive barrel jack, the power bank is almost certainly the same but it's worth a quick check to be sure.

Can I run an electronic piano using a power bank?

1 Answers1