Hi Lyn,
As Tom indicated, we need to determine your daily watt-hour consumption for each day. You can do this by finding the wattage rating of each load, multiplying it by the hours that load will be used, and adding them all up. You are also welcome to use our handy Load Calculator at the following link:
http://www.altestore.com/store/calculators/load_calculator/
Note that there are separate fields for AC watts (loads that require an inverter) and DC watts (loads that run directly off of 12Vdc). If you're unsure of the wattage rating of your loads, there is a list of loads below the fields with typical wattage ratings that can be used as a guide.
We will also need to know your location to size the system for the worst-case peak sun hours available. For off grid designs without a backup system (like a generator), we need to ensure the system will provide enough power even during the lowest-light times of year, and prepare for the possibility of multiple days without sun.
Best Regards,
John Coen
AltE
john @ altestore.com
