Solar Dual Power Input Form
Example Data Table
| Load Type | Running Watts | Daily Hours | Backup Hours | Suggested Use |
|---|---|---|---|---|
| Small home backup | 1200 | 6 | 4 | Lights, fans, router, television |
| Office backup | 1800 | 8 | 5 | Computers, lights, network equipment |
| Pump support | 2200 | 3 | 2 | Motor load with higher surge |
Formula Used
Daily AC Energy: Load Watts × Daily Running Hours
Adjusted DC Energy: Daily AC Energy ÷ Inverter Efficiency × Reserve Factor
Solar Target Energy: Adjusted DC Energy × Solar Share
Required Solar Array: Solar Target Energy ÷ Peak Sun Hours ÷ Solar Derating
Panel Count: Required Solar Array ÷ Single Panel Watts
Battery Storage: Load Watts × Backup Hours × Reserve Factor ÷ Depth of Discharge
Battery Ah: Required Battery Watt-Hours ÷ Battery Bank Voltage
Inverter Size: Higher value between surge watts and 125% of running load
How to Use This Calculator
- Enter the running load in watts.
- Add peak surge watts for motors or compressors.
- Enter daily operating hours.
- Enter average peak sun hours for your site.
- Choose the solar share for your dual power system.
- Add panel rating, battery rating, and system voltage.
- Use realistic efficiency and reserve values.
- Press the calculate button and review the result table.
- Download the result as CSV or PDF.
Understanding Dual Solar Power Planning
A dual power setup uses solar energy first and grid energy when solar output is not enough. This calculator helps compare both sources in one place. It estimates daily load, solar array size, battery storage, inverter capacity, controller current, and grid support. The method is useful for homes, offices, workshops, pumps, telecom units, and small backup systems.
Why Accurate Sizing Matters
Solar equipment should not be guessed. A small array may fail during cloudy days. A weak inverter may trip during motor start. A small battery may discharge too deeply and lose life. Correct sizing improves safety, comfort, and cost control. It also helps select the right number of panels and batteries before purchase.
Load and Energy Basis
The main input is running load in watts. Daily use is found by multiplying load by operating hours. Backup energy is found from load and required backup time. The calculator then adjusts values for inverter efficiency, depth of discharge, reserve margin, and solar derating. These factors make the estimate more realistic.
Battery and Inverter Decisions
Battery capacity is shown in watt-hours and amp-hours. This helps compare different voltage systems. The battery count uses the capacity of one battery. The inverter recommendation includes a safety margin and surge demand. This is important for refrigerators, pumps, fans, and tools that draw extra power at startup.
Solar and Grid Balance
Dual power systems often use solar as the preferred supply. Grid support fills the remaining energy need. The solar share input lets you model different strategies. A higher solar share needs more panels. A lower solar share reduces panel cost but increases grid usage.
Using the Result
Use the result as a planning estimate, not a final engineering design. Check local electrical codes, cable ratings, breaker sizes, mounting space, battery chemistry, ventilation, and inverter limits. For larger systems, ask a qualified electrician to review the final design.
Extra Safety Notes
Always keep room for future load growth. Panel output changes with heat, dust, shade, cable loss, and panel angle. Battery output also changes with age and temperature. That is why the reserve field is included. It gives the design breathing space. Review manufacturer data before buying major components or batteries.
FAQs
What is a dual power solar system?
It is a setup that uses solar power and grid support. Solar may run the load first. The grid helps when solar energy or battery storage is not enough.
Why does the calculator include solar share?
Solar share shows how much energy should come from panels. A higher value increases the required array size. A lower value depends more on grid power.
What is solar derating?
Solar derating reduces ideal panel output for real conditions. Heat, dust, wiring loss, shading, and controller loss can reduce available power.
Why is inverter efficiency used?
An inverter loses some energy while changing DC power into AC power. Efficiency adjustment gives a more realistic battery and solar estimate.
How is battery capacity calculated?
Battery capacity uses load watts, backup hours, reserve margin, and depth of discharge. The result is then converted into amp-hours using battery voltage.
Why is surge wattage important?
Motors, pumps, refrigerators, and compressors may need extra starting power. The inverter should handle this surge without shutting down.
Can I use this for commercial systems?
Yes, it can provide an early estimate. Large systems need professional review for cable size, breakers, protection, grounding, and local rules.
Does this replace an electrician?
No. It is a planning tool. Always verify final equipment choices with qualified electrical guidance before installation.