It currently has a 3 prong twist and lock plug on the end of it's cord, I'd like to convert it to a 'normal' 5-15 plug for home use. I see an adapter here that looks like it would work but a new $ ...

We just got our new UPS in and it has a 120v 20Amp NEMA 5-20P plug on it. Our outlets are 120V 15Amp NEMA 5-15P. My question is: Is an adapter plug a bad idea? Or should I have an electrician come ...