Solar Quote Review: 3 bids for NW USA

I have been collecting several bids, and have it narrowed down to the top 3. I’m hoping you lovely people can help me catch anything I might be missing between the 3 bids. This is for a single-family home in Oregon, USA.

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Bid 1: 7.56 KW total, 21 x SunPower® X-Series: X22-360 (360 W panels), Tesla Powerwall 2 with 13.5 kWh capacity, mySunPower monitoring system, warranty includes shipping and installation costs for any replacements, $27,216 for the solar and $18,218 for the battery (including installation, permits, etc.)

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Bid 2: 8.4 KW total, 21 x Q.Cell Q.PEAK 400 All Black (400 W panels), Enphase IQ Battery 10 (3 x 3.36 kWh batteries in a unified case) for 10.08 kWh capacity, IQ8 microinverters, Enphase IQ Combiner 4/4C, Enphase IQ System Controller, $23,480 for the solar and $20,000 for the battery (including installation, permits, etc.)

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Bid 3: 7.7 KW total, 19 x REC (Renewable Energy Corporation) Alpha pure series 405 W panels, Enphase IQ Battery 10 (3 x 3.36 kWh batteries in a unified case) for 10.08 kWh capacity, IQ8 microinverters, Enphase IQ Combiner 4/4C, (apparently no system controller, is that a big deal? I’m going to ask about this), $29,140 for the solar and $17,250 for the battery (including installation, permits, etc.)

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These prices are in US dollars and DO NOT include any State and Federal rebates or incentives.