This page explains how to determine loads so that you can size your generator for your needs. Normally you want to power the "essential" things and leave some room for other uses.
You must always remember that the generator cannot run at full load for long periods. Always assume that you will need more items powered rather then less and leave a margin of safety above and beyond the continuous load of the generator you select.
It is less expensive to buy more power (higher wattage) in one unit then to buy a second unit or "upgrade" by trading in your old generator for a new one. Often installation costs for a larger unit is a fraction more initially but if you have to upsize your connection afterwards its very expensive.
All these require common sense judgment and some experience. Ask your electrician for advise, he can help you decide what you need.
Below is a short tutorial which will help you understand the basics. The Wattage Guide will provide you with values for the most common items at home and on the job. If you can get nameplate data your calculations will be more accurate, however using the Guide will be sufficient in most cases, especially if you leave yourself plenty of growing room. Make sure you have plenty of size by getting generator big enough for now and the future.
Go to Calculations to use your new understanding and apply the numbers you gathered. You should be able to determine the right size generator for you.
Monday, September 7, 2009
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