1500 kWh/month preset
Solar Calculator for 1500 kWh per Month
Start with 1500 kWh/month pre-filled and test how state production, shade, export value, and offset change the result.
Estimate a higher-usage home at 1500 kWh/month, while keeping future loads and current billed consumption clearly separated.
Estimate preview
Panels, cost, savings
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Estimate solar for 1500 kWh/month
Enter monthly kWh or electric bill. The calculator uses state-level assumptions and shows the math behind the result.
Your estimate
Example resultYou likely need 31-35 panels
Estimated system size: 13.1 kW. This is an estimate, not an installer quote.
Confidence
Medium
Planning estimate only — not an installer quote, engineering design, or tax advice.
Payback uses gross system cost before verified incentives, financing fees, batteries, and roof work.
- Estimated system size
- 13.1 kW
- Sized for your target offset and system loss assumption.
- Likely panel count
- 31-35
- Centered around 33 panels at 400W equivalent.
- Roof space
- 797 sq ft
- Includes a spacing factor, not a final layout plan.
- Annual production
- 18,000 kWh
- Modeled first-year output at the selected offset; not a production guarantee.
- Gross cost
- $30,741 - $39,898
- Before verified incentives, financing, or battery costs.
- Gross cost per watt
- $2.35 - $3.05
- Before incentives. Useful for comparing installer quotes.
- Annual savings
- $4,489
- Based on state residential rate and self-consumption assumption.
- Payback
- 6.8 years - 8.9 years
- Simple gross-cost payback estimate.
Annual usage: 18,000 kWh
Annual production target: 18,000 kWh
State rate: 35.25 cents/kWh
Export assumption: Partial export credit
Direct solar use: 9,900 kWh
Modeled exports: 8,100 kWh
Panel count view
31-35 panels
Estimate shape
Production, savings, and payback
Privacy note: the printable report link stores estimate inputs in the URL, including ZIP and usage or bill values. Keep it private if those details are sensitive.
Local scenarios
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Assumptions behind this estimate
- California state-level electricity rate and solar production defaults are used.
- 100% bill offset target.
- 400W solar panels.
- 14% system loss assumption.
- Roof area uses about 21 sq ft per panel plus spacing factor.
- Gross cost range excludes verified incentives, financing, batteries, roof work, and panel upgrades.
- 55% of annual solar production is modeled as directly used before export.
- Export value assumption: Partial export credit.
- Savings are energy-only and exclude fixed charges, minimum bills, demand charges, and time-of-use detail.
- You provided monthly kWh usage.
- State production defaults are used for this estimate.
Confidence drivers
- Overall confidence: Medium.
- You provided monthly kWh usage.
- State production defaults are used for this estimate.
Expected production: 18,000 kWh
System loss: 14%
Export value: Partial export credit
Direct solar use: 9,900 kWh
Modeled exports: 8,100 kWh
State production default: 1,600 kWh/kW/year
SolarCalcNow provides planning estimates only. Results are not installer quotes, engineering designs, tax advice, financing recommendations, or utility interconnection approval.
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For a home using 1,500 kWh per month in California, the default planning estimate is a 13.1 kW system with 31-35 panels at 400 W each, producing about 18,000 kWh per year and needing roughly 797 sq ft of roof. Estimated gross cost is $30,741-$39,898 before incentives, with simple payback of 6.8 years-8.9 years. The estimate uses EIA Electric Power Monthly, Table 5.6.A, April 2026 residential price (updated 2026-06-25) and PVWatts-style starter production assumption (updated 2026-07-22).
SolarCalcNow provides planning estimates only. Results are not installer quotes, engineering designs, tax advice, financing recommendations, or utility interconnection approval.
Real baseline
What the calculator returns for 1500 kWh/month
Same inputs, different state data: 400 W panels, 1500 kWh/month, low shade, 100% offset target, partial export credit, and no ZIP-level PVWatts override. This makes the state-rate and production assumptions visible before a quote.
| State | System | Panels | Gross cost | Payback |
|---|---|---|---|---|
| California | 13.1 kW | 31-35 | $30,741-$39,898 | 6.8 years-8.9 years |
| Texas | 14.0 kW | 33-37 | $32,791-$43,256 | 15.2 years-20.0 years |
| Massachusetts | 16.7 kW | 40-44 | $46,047-$61,116 | 12.3 years-16.3 years |
1500 kWh per month can represent a larger home, substantial cooling, electric water heating, an EV, or several electric loads combined. The number alone does not identify which loads create the demand.
Review the annual pattern before sizing. A future EV or heat pump should be modeled as a separate load so an installer cannot hide an unexplained usage increase inside the production target.
Compare planning presets
Same calculator engine with a different starting assumption. Useful before comparing installer quotes.
Monthly usage presets
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FAQ
Common solar calculator questions
Is 1500 kWh per month the right solar-planning baseline for my home?
Use 1500 kWh only when it is reasonably close to the annual average shown by your utility bills. The calculator multiplies monthly usage by twelve, applies the selected offset target, and sizes the system from the state production assumption after shade and system losses. A single high summer or winter bill can overstate the year-round requirement, while a mild month can understate it. Average a full year when possible, keep future electric loads separate until they are understood, and compare the result with your available roof. This preset is a starting input, not evidence that every home at this usage needs the same design.
What should I change after running the 1500 kWh preset?
Replace the preset with your own monthly kWh first, then select the correct state and review shade, panel wattage, target offset, direct solar use, and export value. Those controls affect different parts of the result: production assumptions influence system size, panel wattage converts system watts into panel count, and export value changes annual savings without changing the energy the system is asked to produce. Check the visible source dates and confidence notes before comparing quotes. The displayed cost is gross cost before incentives, financing, batteries, roof work, or electrical upgrades, so an installer proposal should keep those items separate rather than presenting one unexplained net figure.
What to do next
After calculating, save the estimate assumptions, check incentive status, and compare installer quotes against the same baseline.