Help Evaluating Proposals?

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I’ve been soliciting a number of proposals for a small residential solar setup (constrained by previous years consumption) and a battery (originally focused on it as a backup for outages but I’ve also learned that my utility only gives 1/2 credit for every unit exported so I’m more inclined to try to leverage beyond emergencies than I originally anticipated).

Here’s what I’ve received:

Quote 1 Quote 2 Quote 3
Total Solar Cost $12,600 $15,759 $15,810
Solar kW 4 3.65 3.4
Cost per Watt $3.15 $4.32 $4.65
Panel Count 10 9 8
Per Panel Watts 400 405 425
Panel Q.PEAK DUO L-G7.3 REC405AA Pure SPR-A425-G-AC A-Series
Panel Mfg LG REC SunPower
Panel Warranty 12/25 yrs 25/25 yrs 25/25 yrs
Inverter 6.0 kW – 240V Single Phase Inverter IQ7A-72-2-US (240V) IQ7XS-96-y-ACM-z-240
Inverter Mfg SolardEdge Enphase SunPower
Inverter Type Optimizers Microinverter Microinverter
Inverter Warranty 25 yrs 25 yrs 25 yrs
Labor/Install Warranty 5 yrs ? ?
Total Battery Cost $15,250 $17,321 $15,850
Battery LG-Chem RESU16H ENCHARGE-3-1P-NA x 3 Powerwall+
Battery Mfg LG Enphase Tesla
Total Capacity 16 kWh 10.5 kWh 13.5 kWh
Round Trip Efficiency 90% 89% 97.5%
Backup Continuous Capacity 7 kW 1.28 kW x 3 5.8 kW
Backup Peak Capacity 11 kW 1.92 kW x 3 7.6 kW
Battery Warranty 10 yrs (70% capacity) 10 yrs/4k cycles (70%) 10yrs/3200 cycles (70%)
Total System Cost $27,850 $33,080 $31,660

I’m very much a novice on the subject. I’ve been doing some research on various components in each proposal and while each option seems to have its positive aspects, it seems like Quote 1 might be the best option due to the price difference?

Thoughts? Anything I might be missing/failing to consider?

submitted by /u/semisolidwhale
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Author: AliensFaith
HighTech FinTech researcher, university lecturer & Scholar. He is studying his second doctoral degree at the Hague International University. Studying different fields of Sciences gave him a broad understanding of various aspects of life. His recent researches covered AI, Machine-learning & Automation concepts. The Information Technology Skills & Knowledge gave his company a higher position over other regional high-tech consultancy services. The other qualities and activities which can describe him are a Hobbyist Programmer, Achiever, Strategic Thinker, Futuristic person, and Frequent Traveler.

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