The Free Solar Designer
for novice learners to professional conractors.
Stop guessing your energy requirements. Our Solar Designer simulates real-world irradiance physics, component degradation, and battery chemistry to validate your exact PV architecture.
Advanced Solar System Sizing Capabilities
Engineer resilient off-grid PV architectures with our professional-grade irradiance and battery simulation tools.
Irradiance Simulation
The physics engine accounts for peak sun hours, panel efficiency ratings, and environmental degradation to calculate true real-world yields.
Battery Chemistry Matrix
We natively model the depth-of-discharge limitations between Lithium Iron Phosphate (LiFePO4) and traditional Lead Acid batteries.
Inverter Load Balancing
The Solar Designer constantly validates your total AC wattage draw against your selected inverter threshold to prevent system clipping.
Off-Grid Specialization
Unlike typical grid-tied estimators, this tool is built entirely for calculating extreme off-grid autonomy and survival parameters.
System Validation
As you adjust components, the engine instantly flags warnings if your battery bank is too small or if your panel array exceeds charge controller limits.
100% Client-Side Physics
The complex mathematical formulas run entirely within your browser's WebAssembly/JS engine, guaranteeing zero latency during component design.
Why standard PV estimators suck compared to the Solar Designer
If you are building an off-grid cabin or outfitting an RV, you know that standard "how many panels do I need" calculators are practically useless. They ignore critical physics like inverter efficiency loss, battery depth-of-discharge, and system voltage limits.
Building a system on flawed math leads to dead batteries in the winter. We built the Solar Designer to solve this exact problem by introducing real electrical engineering logic into a clean web interface.
How the Solar Designer Engine Works
The Solar Designer maps all four critical pillars of an off-grid architecture: Load (Demand), Array (Supply), Storage (Battery), and Processing (Inverter).
As you input your appliances, the engine calculates the exact Watt-Hour requirement. It then mathematically validates that demand against your selected battery chemistry's safe discharge floor, ensuring your design can confidently survive multiple days of terrible weather.