My Solar and Storage savings in 2020. Should you invest in 2021?

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So you might be thinking to yourself, is 2021 the year I should look at getting solar on my property? Should I consider adding battery storage also? In this blog post and in the below video on my YouTube channel I attempt to give you enough data to make a wise decision.

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In 2020 I completed the third and final upgrade to my solar system which takes my system to 16.4kW of panels on 14.4kW of Enphase Microinverters. The entire system now has panels on east, north and west roof. I also have 2 Tesla Powerwall 2’s that I installed in 2017 and 2019 respectively.

In terms of 2020, I achieved:

  • 15.4MWh of solar generation
  • 11MWh of household consumption (~30kWh/day)
    • 3.2MWh of consumption is PW2 charging
  • 2.8MWh consumed from Powerwalls (88% efficiency)
  • 4.2MWh from grid
  • 8.6MWh to grid

Where do we stand in terms of savings:

  • +$1,806 in feed in tariff (21c/kWh – AGL solar savers)
  • -$630 in grid usage (99% of this is off peak, PW2’s don’t discharge off peak as charging Tesla Model 3)
  • -$672 lost feed in tariff that went into PW’s calculated at 88% efficiency
  • +$812 savings from PW2 discharge (calc at 29c/kWh but probably more as most discharge is in peak where costs are 54c/kWh)
  • +2,262 savings in self consumption
  • Total – $3,578 in savings in 2020
    • $140 of this is Powerwall savings but this figure is worst case! Most usage would be saving 54c/kWh not 29c/kWh.

Total Solar ROI

Solar only ROI

Powerwall Only ROI

Powerwall Only ROI

Total System ROI

Total System ROI

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Author: Adam

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