I’ve seen a few generator calculators. Some are hand written and pure guestimates while some are so complicated you probably need to be an engineer to figure out the details. Well, I found this template in the website of Honda Nigeria and I think its pretty much useful. Apart from the annoying dialogue box it displays and the fact that you might need a magnifying glass to see the results clearly, it is still useful in my opinion.
Without wasting your time, just follow the link below;