OFF-GRID SYSTEM LOADS WORKSHEET  
  Use this worksheet to determine the total amp hours per day used by all the AC and DC loads in your system.
 
 
       
  STEP 1 Calculate your AC loads -(If there are no AC loads, skip to Step 2)�  
       
  �1. List all AC loads, wattage and hours of use per week in the spaces provided.� Multiply watts by hours/week to    
  ���� get watt-hours per week (WH/Wk.). Add up all the watt hours per week to determine DC watt-hours per week.
  �Note: Wattage of appliances can usually be determined from tags on the back of the appliance or from the owner's�    
  ���������� manual. If an appliance is rated age (120 or 240) to find watts.    
       
  Description of AC Loads Run by an Inverter Watts X Hours per Week = WH per Week  
  x =  
  x =  
  x =  
  x =  
  x =  
  x =  
  x =  
        TOTAL WH/Week    
         
         
  �2.  DC watt-hours per week. Multiply line 1 by 1.15 to correct for inverter loss.    
         
  �3.  Inverter DC input voltage; usually 12 or 24 volts. This is DC system voltage.    
         
  �4.� Divide line 2 by line 3. This is total amp-hours per week used by AC loads    
       
       
  Step 2 Calculate your DC loads    
       
  �5.� List all DC loads in the space provided.    
       
  Description of DC Loads� Watts X Hours per Week = WH per Week  
  x =  
  x =  
  x =  
  x =  
  x =  
  x =  
  x =  
        TOTAL WH/Week    
         
         
  �6.  DC system voltage. Usually 12 or 24 volts.    
         
  �7.  Total amp-hours per week used by DC loads. Divide line 5 by line 6.    
         
  �8. Total amp-hours per week used by AC loads from line 4.    
         
  �9.  Add lines 7 and 8. This is total amp-hours per week used by all loads.    
         
  �10.  Divide line 9 by 7 days. This is total average amp-hours per day.    
 
 
               


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