Considering a Concert Propel pre-paid lease but I am concerned the installer is padding margins. Thoughts

7.8 kWh w/ 20kWh battery in Los Angeles County

17 x REC Solar REC460AA PURE-RX panels 17 x Enphase Energy IQ8X-80-M-US inverters 2 x Enphase IQBATTERY-10C-1PNA batteries

Costs before Section 48E incentives PV - $23,440 Battery - $25,470

My research suggests this may be high, but my research hasn't been conclusive, so here I am on reddit: the source of all truths.

thanks in advance for your help!