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Hello Macbill, The SL750U would be able to power a 20 watt amp. Thank you for submitting your question!
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Sorry, there was a problem. Please try again later.It might for a short period of time. It's not really designed as a long-term power source but a short-term power assist for powerline fluctuations and outages. It's really designed to power your PC/Monitor for a few minutes until power is restored (short term outage) or to allow you to shut the PC/Monitor down (long-term shortage). When this unit is being used for POWER and not actively getting utility power it has a loud ALARM that goes off every few seconds to alert you of lack of utility power. Not pleasant and not something you'd want to hear while trying to play your guitar. Allen
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