Residential Solar Installation

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Residential Solar Installation

• Michael Demers

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PV on top roof, pool solar below
480 sq ft.
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Rack made of 2x6 P.T. headers, 2x4 rails, 1.5
galvanized posts7000 Fafco system ((12) 4x12
panels), 1200 rack, no other heater on pool,
auto cover
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Performance

• FSEC rating of 48,000 BTU/panel/day
• Use pool 6 months of year.
• 480,000 BTU/day for 182 days 87Mbtu
• Cost of propane would be approx. 2600
• 3.15 year payback.

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8.2KW DC, 660 sq ft.
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Site orientation
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System Specifics

• 22 degree roof pitch
• Array direction south
• Utility intertied, net metered, E7, no batteries
• 8160W DC, 6250W AC, 11,00KWh annual production
• (48) Kyocera KC 170GT Panels
• (2) Fronius IG4000 Inverters
• (4) 12 string module series, 288VDC
• (12) Power Fab racks, 60 posts, 2 splice blocks,
  2 DC disconnect, 1 AC disconnect, 48 ground lugs
• Approx. 13.5 module efficiency
• Gross cost 59,283.89 Net after rebate
  40,333.49 (Rebate level 2.80/watt AC CEC
  rating)

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Performance

• Days in production 609 (1.67 years)
• Predicted Energy generation 18,353KWh
• Actual production 23,308KWh (27)
• Energy value at .15.KWh 3496 (2093
  annualized, 19 year payback.

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Residential Solar Issues

• Relative Cost 6-7/watt after rebates
• Unstable policy, supply chain issues affecting
  forward looking pricing
• Complexity of cost model and payback analysis,
  long sales cycle
• Individual nature of each install (labor cost
  sales and project mgmt)
• Available area
• Roof pitch
• Orientation
• Roofing material
• Access/Cable routing
• Grounding
• Series/parallel wiring
• Space for inverters disconnect h/w

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Opportunities

• Financing residential PPAs (e.g. SolarLease)
• Racking and wiring solutions
• Micro-inverters
• Cooperative pricing
• Monitoring solutions ?Case studies
• Cleaning and maintenance solutions/services
• Bid comparison site (e.g. LendingTree.com)
• Cooling mechanisms
• Integration of inverters, disconnects