Integrated Power Systems > Off-Grid Solar System Sizing Guide

For my Off-Grid Solar System I have my Corrected watt-hrs per day…Now What?


*Note: Points to keep in mind when you are looking at the different systems:

1. Make sure the inverter is large enough to run your loads concurrently.

  • take the highest AC loads in watts, Eg. 6000 watts Given inverters have a 50% surge rate, a 4000 watt inverter will work
  • take the total AC connected wattage at one time. This must be lower than the inverter rating

2. That you have enough battery storage for 1 – 2 days, roughly 30% of total kW storage capacity.

  • take your corrected watt-hrs per day, Eg. 5000 watts x 3.33 = the battery capacity you need, which in this case is 16,650 watts or 16.6 kWh

3. Solar array size required: given good southern exposure with no shading.

  • take your corrected watt – hrs per day, divided by 3 sun hrs/day = the array size this is a good 3 season average number to divide by Eg. 5000 watts /3 = 1660 watts This is the minimum size solar array needed. If there will be shading, adjust accordingly. Using the above points and wattage examples, our Small Home Kit #2 would be a good system to install (providing there are only 120V loads).
One (1) year on installation plus all our products include the manufacturers warranty which range from one (1) to five (5) years, and up to twenty – five (25) on solar panels. After one (1) year, we offer an annual service contract which will cover our labor and travel, all parts will be extra