Skip to main content
ExpertToolkit
Calculators
Health calculators
  • BMI calculator
  • BMR calculator
  • Body fat calculator
  • Ideal weight calculator
Math calculators
  • Percentage calculator
  • Circle area calculator
  • Rectangle area calculator
  • Pythagorean theorem calculator
  • Tip calculator
  • Discount calculator
Converters
Unit conversions
  • Meters to Feet
  • Feet to Meters
  • Inches to Centimeters
  • Centimeters to Inches
  • Miles to Kilometers
  • Kilometers to Miles
  • Kilograms to Pounds
  • Pounds to Kilograms
  • Grams to Ounces
  • Celsius to Fahrenheit
  • Fahrenheit to Celsius
  • Liters to Gallons
  • Gallons to Liters
  • Kilometers/hour to miles/hour
  • Square meters to square feet
Nutrition conversions
  • Apple calories, 1 medium
  • Apple protein, 1 medium
  • Avocado calories, 1 medium
  • Avocado fat, 1 medium
  • Banana calories, 1 medium
  • Banana carbs, 1 medium
  • Beef with egg calories
  • Beef with egg protein
Nutrition comparisons
  • Almonds vs peanut butter
  • Avocado vs olive oil
  • Banana vs apple
  • Blueberries vs strawberries
  • Whole wheat bread vs oats
  • Broccoli vs spinach
  • Chicken breast vs lean beef
  • Raw vs cooked chicken breast
Material density
  • Concrete: 1 yd3 to tons
  • Concrete: 10 yd3 to tons
  • Gravel: 1 yd3 to tons
  • Dry sand: 1 yd3 to tons
  • Topsoil: 1 yd3 to tons
  • Asphalt: 10 tons to yd3
  • Diesel: 100 gal to lb
  • Diesel: 1 bbl to lb
  • Water at 20C: 1 gal to lb
  • Gasoline: 100 gal to lb
Wire gauge
  • 12 AWG, 20A, 50 ft
  • 10 AWG, 30A, 75 ft
  • 120V, 15A, 75 ft
  • 120V, 20A, 50 ft
  • 240V, 30A, 25 ft
  • 240V, 50A, 100 ft
  • 12 AWG vs 10 AWG
  • 10 AWG vs 8 AWG
  • Kitchen outlet, 20A
  • EV charger, 50A at 240V
Formulas
Health
  • BMI formula
Math
  • Percentage formula
  • Circle area formula
Finance
  • Compound Interest formula
  • Mortgage formula
Tables
Length tables
  • Meters to feet table
  • Inches to centimeters table
  • Miles to kilometers table
Weight tables
  • Kilograms to pounds table
Temperature tables
  • Celsius to Fahrenheit table
HomeConvertersSolarPresetsAverage Home — California

Average Home — California — Solar System Calculator

900 kWh/month household in California with high electricity rates. 15 panels, 5.9 kW system. Net cost: $12,390 after IRA 30% ITC. Payback: 3.7 years.

Usage & location

Find on your electricity bill

Panel & battery

15
Panels needed
5.9 kW
System size
$12,390
Net cost (after ITC)
3.7 yrs
Payback period
100% offset$3,321/yr savings5.8 sun hrs/day9,340 lbs CO₂/yr offset
Monthly usage900 kWh
Annual usage10,800 kWh
Peak sun hrs/day5.8 hrs
System size5.93 kW-DC
Panels needed15
Panel area total323 sq ft
Annual production10,924 kWh
Offset100%
CO₂ offset9,340 lbs/yr
Equivalent trees195 trees/yr

Average Home — California — full sizing breakdown

900 kWh/month household in California with high electricity rates.

ParameterValue
LocationCalifornia (CA)
Monthly usage900 kWh
Panel typeMonocrystalline 400W
Mount typeroof-mount
Panels needed15
System size5.93 kW-DC
Annual production10,924 kWh
Offset100%

Full cost breakdown with IRA 30% ITC

LBNL 2023 benchmarks. State incentives not included.

CategoryLowMidHigh
Gross system cost$15,000$17,700$21,000
ITC (30%)–$4,500–$5,310–$6,300
Net cost$10,500$12,390$14,700
Annual savings$3,321$3,321$3,321
Payback period3.2 yrs3.7 yrs4.4 yrs
25-yr net savings$72,520$70,630$68,320

Environmental impact

EPA eGRID 0.855 lbs CO₂/kWh.

MetricPer YearOver 25 Years
CO₂ offset9,340 lbs233,500 lbs
Equivalent trees195 trees4,875 trees
Clean energy10,924 kWh273,093 kWh

California solar resource

EIA 2024 electricity rates.

MetricValue
Peak sun hrs/day5.8 hrs
Electricity rate$0.304/kWh
State incentiveYes — check DSIRE.org
Federal ITC30% (IRA 2022)

Sources & Standards

  1. Dobos, A. P. "PVWatts Version 5 Manual." National Renewable Energy Laboratory, NREL/TP-6A20-62641, 2014.PV system output estimation methodology (irradiance, system losses, tilt and azimuth)
  2. National Renewable Energy Laboratory. "National Solar Radiation Database (NSRDB)."Solar irradiance data underlying production estimates
On This Page
  • Average Home — California — full sizing breakdown
  • Full cost breakdown with IRA 30% ITC
  • Environmental impact
  • California solar resource
  • Sources & Standards
All Tools
  • Calculators Hub
  • Converters Hub
  • Reference Tables
  • Formulas Hub
  • Embed Widgets
Most Popular
  • BMI Calculator
  • Percentage Calculator
  • Length Converter
  • Temperature Converter
Verified Accuracy

All mathematical conversions are rigorously tested against international BIPM and NIST standards.

ExpertToolkit

Free calculators, converters, and reference tables. Every tool shows its formula and its sources.

BIPM/NIST Standards Reviewed
Method and AccuracyStandards: reviewed units and formulasMethodologyEditorially maintainedStandards reviewed regularly

For corrections, privacy questions, or broken pages, contact support@experttoolkit.net

Content reviewed by Anoop Kumar

Core Hubs

  • Calculators
  • Converters
  • Formulas
  • Reference Tables
  • Embed widgets
  • Connect to AI

Popular Tools

  • Chicken breast protein
  • Chicken vs turkey breast
  • Top protein foods
  • Concrete yd3 to tons
  • Steel m3 to kg
  • 12 AWG 20A check

Authority

  • Methodology
  • Sources & Standards
  • Rounding Policy
  • Editorial Policy
  • Corrections Policy
  • Disclaimer
  • Sitemap

Legal

  • Privacy Policy
  • Terms of Service
  • Contact
  • Email Support
  • Report an issue
  • Suggest a tool
  • About Us

© 2026 ExpertToolkit. All rights reserved.

Release 2.5Market: United States