Calculating correct system size for 100% offset

asked 2017-10-02 13:43:51 -0500

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updated 2017-10-02 13:43:51 -0500

c1hy gravatar image

I've chosen a solar installer and am in the process of approving the array layout. I was originally quoted 18 LG 320 panels for 100% offset (roughly 8200 kWh annually).
When reviewing my array layout the installer's production guarantee came out 8014 kWh annually. I asked the installer if the annual production was on the low side since it was their solar production guarantee? Their response was that it was and that they wouldn't be surprised if the actual production was 9000 kWh. I'd appreciate any input if I should add an extra panel to ensure 100% offset or take my installers word that I should be good with the 18 panels quoted. All advise is greatly appreciated!

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