How sure, and what would make it surer

Questions to ask your installer

1. The proposed tilt and orientation, and why.
2. The module count and DC capacity, against the range above.
3. Their expected yield against ours, and the assumptions behind theirs.
4. Whether a shading study was done, and how.
5. The net-metering limit that applies to this connection.
6. Their monitoring access, so generation can be checked against the promise.

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