Off Grid Pro vs Sizer App

Off Grid Pro (formerly Solar PV System Designer, rebuilt from scratch) takes you from "what does my home use?" to a finished wiring diagram and a list of parts to get. It is a guided setup: one step at a time, in plain words, for someone who has never designed a solar system, and quick enough for someone who has. HOW IT WORKS 1. Your home. Pick your appliances room by room, as pictures. The app adds up what your home needs. 2. Battery. Get a recommended battery bank, or enter the batteries you already have. All-in-one cabinets and portable power stations are covered too. 3. Solar. See how many panels you need for your region, how they are grouped into strings, and which charge controller suits them. 4. Inverter. Get the inverter size that carries your home, or choose your own. 5. System. Your whole system in one 3D diagram: batteries, charge controller, busbars, fuses, battery switch and inverter, every cable with its size, and the current shown flowing through the wires. With it comes a shopping list of every part. 6. Build. A step-by-step build guide for your own system, animated in 3D: how a lug, washer and nut go on a battery post, how the batteries are joined, where each fuse goes, the order to connect things in, and what to keep away from at each step. WHAT YOU GET • A 3D wiring diagram of your own system that you can turn, zoom and follow lead by lead • Cable sizes and fuse ratings worked out for every circuit • A battery monitor shunt and a battery isolator switch where the system needs them • Solar strings matched to the charge controller's voltage and current limits • A parts list for the whole system • An animated build guide with safety notes at every step • Several projects, with undo and redo THE BUILD GUIDE The first chapter of the build guide (what you need, and wiring the batteries) is free. The full guide for the rest of the system is a one-time in-app purchase: bought once, yours for good, and it also removes the ads. There is no subscription. A NOTE ON SAFETY This app is a planning tool. Batteries and solar panels can deliver dangerous currents and voltages. Have your design checked, and the mains side connected, by a qualified electrician, and follow the manuals of the equipment you buy and the electrical rules where you live. Questions or ideas: https://offgridpro.app

Sizer is a professional-grade solar system sizing application designed to simplify the complex process of designing efficient and safe solar installations. Whether you are a solar installer, engineer, or energy enthusiast, Sizer provides powerful tools to accurately estimate energy requirements and generate complete solar system specifications in minutes. FEATURES • Load Calculator Easily build your energy profile by adding appliances, usage hours, and wattage. Sizer automatically calculates total daily energy consumption and includes system losses for realistic results. • Complete System Design Generate full system requirements including solar panel capacity, battery bank sizing (Ah & kWh), inverter rating, and charge controller specifications. • Protection & Safety Tools Design safer systems with built-in recommendations for DC and AC breakers, surge protection devices (SPD), and professional cable sizing based on electrical safety standards. • Project Management Save and manage multiple solar system configurations. Resume your work anytime and organize projects efficiently. • Secure Access Sign in securely using Email, Google, or Apple to access your data across devices. • Premium Access Unlock unlimited calculations with a subscription designed for professionals. IMPORTANT NOTICE Sizer provides estimation tools intended to guide solar system design. Final installation decisions should always be verified by a qualified professional. Sizer transforms a complex engineering process into a simple, reliable, and efficient workflow — helping you design solar systems faster, safer, and smarter.