Calculator
Example Data Table
| Scenario | Panels | Peak Sun Hours | Panel Efficiency | Battery Share | Daily Load |
|---|---|---|---|---|---|
| Small home | 8 | 4.8 | 20% | 35% | 14 kWh |
| Medium home | 12 | 5.2 | 21% | 40% | 20 kWh |
| Workshop | 18 | 5.6 | 22% | 25% | 32 kWh |
Formula Used
Array area = panel count × area per panel
Solar input = irradiance × peak sun hours × array area ÷ 1000
Panel DC energy = solar input × panel efficiency
Adjusted DC energy = panel DC × temperature factor × shading factor × cable factor × controller efficiency
Direct AC energy = direct DC path × inverter efficiency
Battery stored energy = minimum of charged battery energy and usable battery limit
Battery AC energy = stored energy × discharge efficiency × inverter efficiency
Total useful AC = direct AC energy + battery delivered AC energy
Load coverage = load met ÷ daily load × 100
Savings = load met × electricity rate
How to Use This Calculator
- Enter your solar irradiance and peak sun hours.
- Add panel count, panel area, and panel efficiency.
- Enter losses for temperature, shade, and wiring.
- Add controller, battery, and inverter efficiency values.
- Enter your battery capacity and daily load demand.
- Press the calculate button to see the transformation path.
- Use CSV or PDF buttons to save your result.
Solar Energy Transformation Guide
Solar power starts as sunlight. A panel turns part of that sunlight into direct current. The system then moves energy through cables, a controller, a battery, and an inverter. Each step changes the amount of useful power. This calculator follows those changes in a clear order.
What the calculator follows
The first stage is solar input. It uses irradiance, peak sun hours, panel area, and panel count. This gives the daily light energy that reaches the array. The second stage is panel conversion. Panel efficiency shows how much light becomes DC energy. Temperature, shade, and cable losses reduce that value. The controller then passes energy toward direct use or storage.
Why losses matter
Real systems lose energy at many points. Hot panels usually make less power. Shadows can reduce output, even when only part of the array is covered. Long cable runs also waste energy. Charge controllers and batteries add more losses. Inverters change direct current into alternating current, but they are not perfect. Small percentages can become large daily differences.
Reading the result
The final result separates direct AC energy and battery delivered AC energy. This helps you see how much power can serve loads now, and how much can serve loads later. It also compares useful energy with the daily load. If useful energy is lower than the load, the shortfall must come from grid power, a generator, or a larger solar design.
Planning better systems
Use the result as a planning estimate. Try different panel counts, battery sizes, and loss values. A larger array may solve winter shortages. A better inverter may improve delivered energy. Lower cable loss may help remote installations. Good estimates support safer budgets and better equipment choices.
Practical design notes
The calculator does not replace a site survey. Roof angle, local weather, dust, wiring rules, and equipment limits still matter. Use conservative inputs for important projects. Compare several days, not only the best day. A realistic transformation path can prevent oversized promises and undersized systems.
Keep records of monthly loads and seasonal sunlight. Better records improve every input. They also reveal habits that waste stored energy. Simple conservation often reduces required panels, batteries, and installation cost over time too.
FAQs
What is solar energy transformation?
It is the path from sunlight to usable electricity. The calculator tracks sunlight, DC panel output, storage losses, inverter output, and final AC energy for your load.
Why is peak sun hour important?
Peak sun hours estimate strong sunlight available in one day. More peak sun hours usually mean more solar input and more possible electrical output.
Why is panel efficiency needed?
Panel efficiency tells how much sunlight becomes DC electricity. A higher value produces more energy from the same panel area and sunlight.
What does battery share mean?
Battery share is the percentage of controller output sent toward storage. The remaining energy moves through the direct inverter path for immediate AC use.
Why can battery curtailment appear?
Curtailment appears when the battery path receives more energy than usable battery capacity allows. That extra stored-path energy cannot be counted as delivered energy.
Does this replace a solar installer?
No. It is an estimating tool. Final design should consider roof structure, local rules, inverter limits, wire sizing, safety devices, and professional inspection.
Can I use this for off-grid systems?
Yes. It is useful for off-grid planning because it includes battery capacity, discharge limits, load coverage, and energy shortfall.
Why are savings only based on load met?
Savings are calculated from useful solar energy that serves the load. Surplus energy is not counted unless your project has a separate export value.