Use ANY guitar amp without a power outlet

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March 20, 2019 by vicwomg

Here’s a question I’ve seen come up again and again: “Which battery-powered amp should I get?”

Fender Pro Jr. tube amp powered by a lunchbox-sized battery

In my past life as a software engineer, I learned this lesson quickly: asking the wrong question often yields the wrong solution.

In the early days, I’d nervously walk up to a more experienced engineer and start rattling off a hyper-specific question, probably while fingering exact lines of code on the laptop cradled in my arms. My thought process was this: I need to prove that I have been really digging through the weeds and whittle my question down to something unambiguous to save their precious time while saving face. After some confusing back-and-forth I’d usually get the quizzical response, “what exactly is the problem you’re trying to solve?”

That, as it turns out, is the only question that I should have been asking. In the end, the more-experienced engineer would likely just google a term I had never heard of that precisely describes my problem, and present me with a handful open-source libraries (or a stack overflow post) that already solved it. Turns out all my prior digging was unnecessary. I got a better solution from a different angle.

In this case, the problem is perhaps this: I’m playing a rustic wedding ceremony while floating on an artisanal hand-whittled raft in the middle of a frog pond for a small audience of 50 (purely hypothetical–I can’t swim and I’d probably turn down this gig).

In summary: I want to amplify my guitar without access to a power outlet. Now I might think, “clearly I need a battery-powered amp. Now which is the least-crappy sounding battery-powered amp and how much does it cost?” Wrong questions! How about: how do I power the amp I already have?

With the same lithium battery technology used in electric cars and smartphones this is now possible in a package as small as a lunchbox.

We now have these great camping/emergency batteries that include a standard 120V mains outlet. Various models are all over Amazon, but I got the cheapest I could find: a 222-watt hour model by Suaoki for under $150. It has one multi-international outlet with a ground pin, and one 2-prong outlet. It also has some handy USB ports for charging devices. I suppose the other benefit of these is you can use them for, well, camping and emergencies too.

222 watt hour means you can power a 222-watt device for about one hour. So if your amp is 60 watts, you can power it for 3.7 hours. But the real figure is much more, because your amp probably only uses 60 watts at full volume. If you’re like me, playing at full volume, or even anywhere near it, never happens.

I’ve powered my AER Alpha for multiple 2-3 hour gigs without recharging. I’ve also put some 15-watt tube amps through it, like my Fender Princeton Reverb. I’ve even plugged in power strips and powered multiple devices. I’ve loaned it to a buddy who powered a PA with it.

The only issue I’d report is that there can be some noise interference due to the transformer in the power supply. Be sure to move it a few feet away from the amp. Also, single-coil pickups tend to hum more when not touching the strings since there isn’t grounding to speak of. If anyone knows a solution to this, let me know. Although, perhaps I’m asking the wrong question 🙂

If you MUST get a battery-powered amp, I’d recommend something from Roland’s CUBE series. They run on AA batteries for a truly impressive amount of time and volume. Don’t bother with stuff with heavy, proprietary sealed-lead-acid batteries. Guess what, if you forgot to charge it you’re out of luck. If some ubiquitous AA batteries ran out, you can solve that problem much more easily.


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