The Smart Solar Calculator Pro is designed as a comprehensive field tool for renewable energy engineers and technicians. It aims to convert load schedules and power sources into precise engineering outputs to calculate battery capacities, panel quantities, MPPT charge currents, and true inverter capacities. It fully supports both Off-Grid and Hybrid systems, accounting for system losses and heavy load surge currents. The calculator also features an advanced section for estimating cable sizes and breaker protections accurately based on distance and climate, and a dedicated section for large commercial projects supporting High Voltage (HV) and 3-Phase architectures to meet the demands of large buildings and factories.

The calculator features Progressive Web App (PWA) capability, allowing it to work efficiently in remote field locations and completely offline areas without requiring an internet connection.

Installation Steps on Smartphones (Chrome Browser as an example)

• 1. Open Browser Menu: From the top of the browser, tap on the browser options (the three dots).
• 2. Select Install: Look for the option "Install app" or "Add to Home screen".
• 3. Confirm Installation: A popup window will appear with the official app icon and link, click "Install".
• 4. Direct Launch: The system will process the request and add the Smart Calculator icon directly to your home screen. You can now close the browser and open the tool as a fully independent program working without an internet connection (Offline Mode), relying on your local storage.

This section represents the governing inputs that directly influence the overall design equations of the system:

• System Voltage: A critical option determining battery connection (series/parallel). Choose between standard systems (12V, 24V, 48V). The correct voltage reduces cable thickness and current losses.
• Target Panel Power (W): Field to input the target solar panel wattage (e.g., 450W). Based on this, the total array output is divided to determine the actual number of panels.
• Peak Sun Hours: The effective hours panels produce their nominal power based on geographical location (engineering standard is usually 5 to 6 hours).
• Panel Climate (Thermal Performance): An engineering option considering thermal degradation on solar cell efficiency to ensure field output doesn't drop:
  • 1. Moderate Climate: Used in standard environmental conditions.
  • 2. Very Hot Climate: Used in desert and hot regions; the algorithm automatically increases the array capacity to compensate for power loss due to panel heating.
• Battery Protection Rate (DoD): Represents the maximum allowable Depth of Discharge, keeping the remainder as a safety reserve to protect battery cells and extend their lifespan. Engineering concept: entering 80 means the calculator uses only 80% of battery capacity for actual load, reserving 20% to prevent deep discharge.
  
  Recommended Values:
  • Lithium Batteries (LiFePO4): 80% to 90% (Maximum utilization with high safety).
  • Lead Acid / GEL Batteries: 50% (Prevents rapid battery degradation).

Used when the site is equipped with an external power source (like the national grid or a generator) alongside solar panels and batteries. The calculator utilizes grid availability hours to reduce the required panel and battery sizes, lowering overall system costs.

Hybrid System Input Fields:

• Daytime Charge Hours (Panels): Enter the hours grid/generator power is available during the day to help run loads and reduce the required number of solar panels.
• Nighttime Charge Hours (Battery): Enter the hours the system is powered by the grid/generator at night to charge batteries directly and reduce the required storage capacity.
• AC Charge Current (Amps): Enter the charging current in (Amps) written on the hybrid inverter charger or generator, so the calculator knows the amount of charging energy entering the system during operation.

This section is an advanced supplementary engineering tool for estimating and selecting appropriate copper cable sizes and electrical breaker protections for each part of the system accurately and safely.

Cable & Breaker Input Fields:

• Battery Cable Distance (m): Enter the distance (in meters) between the battery bank and the inverter/controller unit. The calculator will estimate the best battery cable size and select the appropriate main breaker for high current.
• AC Load Cable Distance (m): Enter the distance between the inverter and the home's AC distribution board to estimate the appropriate AC supply cable size and protection breaker.
• Cable Climate Factor: The dropdown allows selecting a thermal safety factor based on the installation environment:
  • 1. Moderate Climate (1.25x Safe): Standard factor for normal environmental conditions.
  • 2. Very Hot Climate (1.50x Safe): Doubled safety factor for extremely hot regions to avoid cable overheating and increased resistance.

Dedicated to commercial projects, factories, and large buildings to instantly determine system size and engineering architecture.

Commercial Project Input Fields:

• Electrical System Type: Allows you to choose the appropriate system architecture for the project, including:
  • 1. Single-Phase.
  • 2. 48V 3-Phase.
  • 3. High Voltage (HV) to increase efficiency and safety for major projects.
• Total Daily Consumption (kWh): Field to input the total daily energy required for the project (e.g., 50 kWh). This activates the Large Scale Project mode and bypasses the individual appliance table to prevent double counting.
• Daytime Operating Hours: Enter the actual operating hours during daytime (sunlight). The calculator computes direct daytime consumption to size the panels required to feed loads directly without passing through batteries.
• Nighttime Operating Hours: Enter operating hours during the night. The algorithm uses this to determine nighttime consumption percentage and assigns the required storage capacity (kWh) for the battery bank to accurately cover night operations.

Here, the client's consumption pattern is meticulously broken down and analyzed by clicking the "Add New Appliance" button.

• Appliance Name: A flexible text field to identify the load type (e.g., Split AC, Fridge, Lights).
• Continuous Power (W): The nominal electrical power the appliance consumes during stable operation. This is the base value for total panel and battery energy calculations.
• Surge Power (Heavy): An advanced engineering feature for motor-driven (Inductive) loads like ACs and pumps that draw double current at startup. This is calculated for the inverter only.
• "Sync" Checkbox:
  When checked, it assumes this appliance might start at the exact same moment as other synchronized appliances, combining surge powers to ensure a massive inverter size capable of handling the instantaneous shock.
  When unchecked, normal consumption is calculated without adding its surge current to the inverter's maximum cumulative calculation.
• Quantity: Number of identical appliances in pattern and power.
• Duty Cycles (%): Select the operation nature to avoid unrealistic consumption inflation:
  • 100%: Continuous for lights and screens.
  • 70%: Moderate for ACs and heaters.
  • 50%: Intermittent for fridges and cyclical appliances.
• Operating Hours (Day / Night): Precise hour separation (Daytime during peak production, or Nighttime relying entirely on batteries). This separation dictates the precise calculation for required battery energy capacity.

Once data is entered, the app processes the engineering equations and outputs results as follows:

• 1. Total Energy with Losses (Etotal): Total daily energy consumption measured in (Wh/day), adding standard system loss factors covering cables, inverter, and batteries.
• 2. Required Lithium Battery Capacity (Ah):
  • Ampere Capacity (Ah): Required battery size based on night loads and chosen Depth of Discharge.
  • Actual Energy (kWh): Stored energy in kilowatt-hours for easy comparison with wall-mounted market batteries.
• 3. Required Solar Panels: The actual number of panels rounded to the nearest higher integer, showing the total array capacity in Watts.
• 4. Minimum MPPT Charge Current: The minimum current the charge controller must handle. If the load exceeds limits, the calculator shows a smart alert specifying the minimum number of charge controllers required.
• 5. Required Inverter Capacity: Uses a smart sizing system. Standard size (Green badge) indicates perfect harmony with chosen system voltage and shows the appropriate commercial capacity.

6. Cables & Breakers Specs (For Standard Residential Systems):

This card appears when entering connection distances, providing critical technical guidance for cable cross-sections and breakers to protect the system from voltage drops and thermal spikes:

• Battery Cable & Breaker: Determines pure copper cable size (mm²) and appropriate DC Breaker based on maximum drawn current and connection distance.
• AC Load Cable & Breaker: Determines the AC supply cable size heading to the home distribution board and the safe AC breaker.
• PV Array Cable & Breaker: Determines the PV descending cable size and recommended DC protection breaker based on total array current.

7. Commercial Architecture Card (For Large Projects)

Activates automatically when entering daily project consumption (kWh) to provide a comprehensive architectural and execution map:

• System Architecture: Displays the approved connection pattern for the project (48V Single-Phase, 3-Phase, or High Voltage HV).
• Inverter Parallel Setup: Shows the total number of recommended inverters with their individual capacities distributed in parallel to cover the load.
• Power per Phase: In 3-Phase systems, it shows the load capacity distributed per line to ensure phase balance.
• Battery Racks & PV Strings Topology: Illustrates how to connect Lithium modules (Parallel/Series) and distribute PV Strings calculating maximum Voltage (Voc) in High Voltage systems.
• Main Cables & Breakers (DC): Determines the heavy cross-sections for cables or Copper Busbars and main protection breakers responsible for linking large clusters.

Smart Engineering Alerts & Warnings System:

The calculator relies on a smart, multi-level evaluation engine to protect the system from thermal and design risks:

• 1. 12V / 24V Overload Upgrade Alert: Appears instantly (Red Card) if 12V/24V is selected for massive loads exceeding safe current limits. The calculator provides an immediate technical proposal with a strong recommendation to upgrade to a 48V system.
• 2. Parallel Setup Conditions Alert: When capacity crosses 16kW on 48V, the calculator distributes power across multiple units in parallel, displaying a massive alert outlining mandatory engineering conditions (matching models, firmware, and equal cable lengths/sections).
• 3. Critical Range 48 Alert: Reaching this capacity triggers an orange alert warning of high currents on AC lines, strongly advising transitioning to a 3-Phase system for balanced load distribution.
• 4. Max 16 Units Parallel Limit Alert: Appears when the requested parallel units exceed 16 on 48V. The calculator issues a stop warning due to the practical impossibility of synchronizing this number, directing the user immediately to Large Projects & HV mode.
• 5. Hard Stop > 1000A / HV Mandatory: A strict red warning appears when loads exceed 48kW (equivalent to over 1000 Amps on 48V). The app entirely prohibits parallel connections for this capacity to avoid combustion and thermal damage, mandating an immediate transition to High Voltage architecture (800-1600 HV) to guarantee maximum safety and efficiency.

Add an official and professional touch to your workflow deliverables for clients and companies by printing integrated engineering reports.

• 1. Enter Report Data:
  • Engineer / Company Name: Enter your name or engineering firm name.
  • Client / Project Name: Enter the client or project name to include in the report header.
• 2. Export Report (Blue Export Button): Click the Export PDF Report button; the smart engine will format all data and outputs into an engineering document fully compliant with ISO A4 global printing standards, with numbered, secure pages ready to be shared via WhatsApp or Email.