Are these 3 quotes all from the same company, or different? Are they large companies, or local installers?
On first look they all seem like pretty good deals, I’d be happy with any of these on my roof. The QCells with Fronius is the pick of them I’d say. Fronius is at the top of our Best Solar Inverter 2018 list, and QCells and Canadian are both high on our Best Solar Panels list.
What it will come down to in the end is the solar company. We like smallish local electricians with good reputations, because they are more likely to care if anything goes wrong, and more likely to be around long term.
I hope that helps, and please let me know if you have any follow up questions. Getting solar can be very daunting!