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- 1.9kW second-hand solar panels (though if there’s no used panels near you then new ones 4 x 455W = $746 is great too)
- 6 x 320W Sunpower T5s @ $50
- $300
- 3kW inverter, solar controller, UPS all-in-one
- 3kW pure sine wave inverter
- 4kW MPPT solar charge controller
- UPS function - falls back to grid when battery empty
- $495
- 2.5kWh battery
- $420
=> $1,215 total
Component alternatives:
- 3kW inverter, solar Controller, UPS
- $659
- 3kWh battery
- 3kWh battery
- $1,090
Financial Payback & Embodied Energy
Financial payback period for 3000W
System cost : $1,200 on Amazon in 2023
Yearly energy creation: 365d * 4.26hsun/d * 1800W = 2,800kWh/y (but more like 1,100kWh/year)
Yearly value creation: 1,100kWh/y * $0.29/kWh = $319/y energy created
100W system payback period: $1,200 / $319 = 4 years until payback
How green is it:
Production footprint PV (source):
2,900kWhee/kW * 1.8kW = 5,200kWh embodied energy
Production footprint LiFePo4 battery (source):
106kWhee/kWh * 2.4kWh = 254kWh embodied energy
Annual energy production system: 1100kWh/y
Payback period: 5450kWh / 1100kWh/y = 5 year footprint payback