Pricing? Fair? Low?

I'm not an electrician by any means, but I know enough. I've never charged anyone to do any eletrical work. I've always done it free. I have a job to wire and install 6 outlets on an outdoor metal canopy and to wire in a timer to a pool pump. $600 is what I asked and the customer agreed. My question to you guys is is that fair? Is it too little? How do you guys charge for small jobs like this??