Solar Builder

Features

Everything you need to plan a system

Whether you're planning a van build, cabin, or full home backup system, map out your system, test ideas, and know exactly what you need.

🖱️

Drag-and-Drop Canvas

Place, move, and connect components on a pan/zoom canvas. Click terminals to draw wires, drag bend points to reroute, and right-click for rotate and swap options.

☀️

Real-Time Simulation

Step through a full day with the time-of-day slider. Watch battery SOC change, PV output shift with irradiance, and load balance adjust in real time.

📦

Component Database

Pick from 100+ real panel models across 20 brands including Renogy, Victron, Jinko, SunPower, and more. Selecting a model auto-fills all electrical specs.

📐

Auto AWG Wire Sizing

Every wire is sized to the correct gauge for its current. Wire thickness scales visually with ampacity, from 22 AWG signal wires up to 4/0 AWG battery cables.

📉

Voltage Drop & Overload Alerts

Set a max voltage drop % per wire. Overloaded or over-drop wires light up with warnings. Worst-case VDrop is tracked in the summary panel.

🌊

Animated Power Flow

Animated arrows on each wire show current direction and speed proportional to power, so you can see charging vs. discharging at a glance.

⚠️

Fault Detection

Short circuits, blown fuses, PV string overvoltage, and battery voltage mismatches are all detected and flagged with visual alerts on the offending component.

📊

System Summary Panel

Live totals for PV wattage, battery capacity (Ah & kWh), DC and AC daily load, estimated autonomy in days, and solar sufficiency rating.

💾

Export / Import JSON

Save your full design including components, wires, specs, and positions to a portable JSON file. Reload it any time. No account, no cloud, no lock-in.

Design Your Solar System Visually