Carefully filling out the following tables will result in a reasonable estimate of your electrical needs. Be conservative but remember that many appliances have worst case inflated wattage use listed on their labels. Remember also that you should be using efficient AC or DC lighting (not incandescent bulbs). The amount of time each appliance is used should be carefully thought out as well. A submersible pump or vacuum cleaner uses a large number of watts but usually only for a short time. Conversely a circulator pump may take only a few watts to run, but can run for large amounts of time in the winter when you can least afford it. Consult The Solar Electric Independent Home Book for more details on load calculations.

 

DC Appliance 

Hours/Day x Watts/Appliance = Watt-Hours/Day/Appliance

 

                                                                                                                                                   

                                                                                                                                                  

                                                                                                                                                  

                                                                                                                                                  

                                                                                                                                                  

                                                                                                                                                  

                                                                                                                                                  

                                                                                                                                                  

                                                                                                                                                  

DC Average Daily Loads:                                                              

 

AC Appliance

 Hours/Day x Watts/Appliance = Watt-Hours/Day/Appliance

 

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

                                                                                                                                                

 

 

Subtotal AC Average Daily Loads:                                                           

 

TOTAL AC and DC Average Daily Loads: