/diy/ - Do It Yourself

So uhh lets say i've got a 60W 12V PSU and a machine that has an average consumption of 50W but that often demands more, like 100W, for minutes at a time and if it doesn't get what it wants it malfunctions, so it wouldn't work just with the 60W. Is there any way i could make this combination work? Something to do with capacitors or batteries or something so when the demand is low the PSU can charge up the capacitor and when the demand is high the capacitor can provide the extra.
And yes i know i can get a 500W computer PSU for 10€ but in this case i do not want to do that.