Solar Buddy Calculators
Precision solar engineering tools calibrated for Indian grid standards. Size cables, optimize strings, calculate battery storage, and model ROI — all for free.
AC Cable Sizing
Based on IS:1554 Part I standards
Engineering Assumptions
| Material | Recommended | Capacity | Cost/Weight |
|---|
DC String Cable
Voltage drop & cable optimization
Engineering Assumptions
Battery Storage
Capacity & backup time sizing
Lead Acid: Conservative 50% DoD for long lifespan
Engineering Assumptions
Solar Plant Size
Based on consumption
Engineering Assumptions
ROI & Payback
Financial viability modeling
Financial Assumptions
Ready to Calculate
Fill in the parameters. Results update instantly.
Engineering Standards
Our tools follow rigorous Indian electrical standards for safe, efficient solar installations.
IS:1554 Part I
AC cable sizing recommendations based on Bureau of Indian Standards guidelines with 45°C ambient temperature and 1.25× continuous duty safety factor.
Battery Chemistry Aware
Dynamic DoD calculation adjusts for Lead Acid (50%), Lithium LFP (80%), Sodium-Ion (85%), and Gel/AGM (60%) to maximize battery lifespan and usable capacity.
Voltage Drop Optimization
DC string calculations target 1-3% voltage drop range. Keeping drop near 1% ensures maximum energy yield and system efficiency.
Why Proper Cable Sizing Matters
Proper cable sizing is the backbone of any reliable and safe solar power system. Undersized cables lead to excessive voltage drop, overheating, and significantly reduced system efficiency — ultimately impacting your Return on Investment.
Our specialized tools help solar engineers, installers, and DIY enthusiasts find the perfect balance between safety, optimal efficiency, and budget management.
Explore ProductsFrequently Asked Questions
How to calculate solar cable size?
Determine the maximum current (Amps), cable run length, and acceptable voltage drop. For AC cables, our tool factors in Inverter Rating, System Type (1Φ/3Φ), and conductor material to recommend the precise sq.mm size based on IS:1554 standards.
What is the recommended DC voltage drop?
The recommended maximum voltage drop for DC strings is between 1% and 3%. Keeping the voltage drop near 1% is optimal for maximum energy yield. Our DC String Calculator lets you set your target to calculate exact power loss.
How is battery backup time calculated?
Backup Time = (Battery Capacity × System Voltage × Efficiency) / Total Load. You must also factor in the Depth of Discharge (DoD) specific to the battery chemistry. Our calculator automates this for Lead Acid, Li-Ion, Sodium-Ion, and Gel batteries.