Planet Electrical • Solar Savings Calculator (NZ)

Solar Savings Calculator (NZ)

Planet Electrical – quick estimate. For an exact quote, we’ll confirm on site.

Your details

Step 1 · Inputs
Includes GST. We’ll back-calc your annual usage.
Blended unit rate. Adjust if you’re on TOU.
Leave as 0 to use the size above.
Estimates only — we’ll confirm with a site visit

Results

Step 2 · Estimate
Recommended system
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Panels
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Annual generation
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Self-use vs export
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Savings

Annual bill savings

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Impact

CO₂ avoided per year

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Monthly production vs usage (kWh)

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Includes defaults & assumptions below. Tweak inputs for your situation.

Assumptions (editable by Planet Electrical)

Adjust these in the code as prices or tariffs change.

  • Specific yield by region (kWh/kW·yr): Auckland 1300; Waikato/BOP 1350; Wellington 1250; Canterbury/Otago 1380; Southland 1200.
  • Orientation multipliers: N 1.00 · NE/NW 0.96 · E/W 0.90 · Flat 0.93 · S 0.78.
  • Self-consumption baseline: 55% (≤3 kW), 45% (3–6 kW), 35% (6–10 kW), 30% (>10 kW); boosted by daytime share.
  • Battery: round-trip efficiency 92%, max ~0.7 cycles/day; usable depth already applied to size input.
  • Installed cost guide: base $1,800 + $2,200/kW (ex battery). Battery $1,000/kWh (placeholder).
  • Grid carbon factor: 0.11 kg CO₂e/kWh (NZ average, placeholder).
  • Panel options: SunPower 440 W @ 1.90 m²; Longi 440 W @ 1.92 m².