When purchasing a generator, it's important that you select one that's capable of meeting your energy requirements.
To determine which Yamaha generator best meets your energy requirements you simply select the products you are planning to use at the same time and add these to the matchmaker or follow the approach described in Step by step.
Product Running Watts Starting Watts Select
INDOOR
Radio 200 200
TV 200 200
Vacuum cleaner 600 750
12V Battery Charger 120 120
Coffee maker 1400 1400
OUTDOOR
Circular Saw 800 1000
Floodlight 1000 1000
Chain Saw - 14 inch electric 1200 1500
Clear  Recommend generator(s)>
Alternatively to determine which Yamaha generator best meets your energy requirements you can follow theĀ approach described inĀ  Step by step.
*Starting Watts
The starting watts must be under the maximum power output of your Yamaha generator. Normally, you can disregard a starting multiplying factor bigger than 3 times the running watts when using a Yamaha generator. 

If the generator is properly sized, Yamaha's surge capacity or 3 times the rated output for 3 seconds is usually sufficient