When we where getting solar there where a bunch of websites/companies that were estimating how much solar we would produce based on our system size. Check out the ‘Sizing our solar system’ section in our Solar Journey post for more information. I recorded what each of the websites quoted us and will track them against what our system will actually produce. If you come across a website that you would like to test against our system we live near Bakersfield in California and have a 5.1 kW solar system. Most companies will give you the daily average, so multiply that number by 5.1 and then either 30 for the monthly average or 365 for the yearly average.

Roof Orders | Fab Habs | PV Watts | Solar Handbook | Tycon Systems | Actual | |

December | 439 kWh | 347 kWh | 575 kWh | 397 kWh |
841 kWh | 385 kWh |

January | 525 kWh | 386 kWh | 597 kWh | 413 kWh |
876 kWh | 450 kWh |

February | 579 kWh |
486 kWh | 799 kWh | 507 kWh | 857 kWh | 585 kWh |

March | 673 kWh | 716 kWh | 880 kWh |
805 kWh | 1121 kWh | 854 kWh |

April | 745 kWh | 872 kWh | 928 kWh | 995 kWh |
1114 kWh | 989 kWh |

May | 816 kWh | 972 kWh |
896 kWh | 1184 kWh | 1176 kWh | 1065 kWh |

June | 826 kWh | 1065 kWh | 877 kWh | 1222 kWh | 1134 kWh | |

July | 836 kWh | 999 kWh | 863 kWh | 1219 kWh | 1149 kWh | |

August | 836 kWh | 954 kWh | 799 kWh | 1095 kWh | 1187 kWh | |

September | 745 kWh | 788 kWh | 712 kWh | 889 kWh | 1163 kWh | |

October | 673 kWh | 627 kWh | 592 kWh | 702 kWh | 1108 kWh | |

November | 525 kWh | 441 kWh | 541 kWh | 474 kWh | 933 kWh | |

Total | 8285 kWh | 8653 kWh | 9059 kWh | 9901 kWh | 12660 kWh | 8656 kWh |