Fortress Power Installer Tools — Size, Design, and Wire the Perfect Battery System
Free online tools built for solar installers, dealers, and DIYers. Size your system, validate your wiring, and calculate your PV string array, all in one place.
The Tools Installers Need to Size, Wire, and Quote Fortress Power Systems.
Installing a Fortress Power battery storage system starts with the right design. Our suite of free installer tools takes the guesswork out of system sizing, wiring configuration, and solar string calculations — so you can spend less time on spreadsheets and more time closing jobs. Whether you’re quoting a residential backup system, designing an off-grid installation, or helping a homeowner understand their options, these tools give you engineering-backed recommendations in minutes.
System Recommendation Tool
Battery and Inverter Sizing for Any Installation
The Fortress Power System Recommendation Tool walks you through a simple four-step process to size the right battery and inverter combination for your customer’s project. Enter the installation details, select the loads you want backed up, and get instant system recommendations based on real engineering rules — no lookup tables, no manual calculations. Homeowners can also use it to explore their options and find a certified local installer near them.
- Residential sizing in minutes
- 100+ pre-loaded appliances with editable wattage and hours per day
- Quick Start packages take the guesswork out of deciding what to backup and for how long
- Engineering-confirmed battery-to-inverter ratio rules built in
- Supports on-grid, off-grid, indoor, outdoor, and grid export configurations
- Covers the full Fortress Power product lineup
- Warranty compliance check — flags any combination that doesn’t meet minimum battery requirements and suggests an upgrade
- Downloadable branded PDF report ready to share with your customer
- Certified installer finder with 300+ partner locations across the US and Puerto Rico
Battery and Inverter Wiring Validator
Plan Your Installation with Confidence
The Fortress Power Wiring Validator helps installers and DIYers plan the physical wiring layout for any Fortress Power battery and inverter combination. Select your inverter model and quantity, choose your battery, and the tool walks you through sharing scheme, bus rail configuration, and conductor sizing — step by step. It integrates directly with the System Recommendation Tool, so your selected system loads automatically with one click.
- Supports all current Fortress Power inverter and battery combinations
- Step-by-step wiring guidance from inverter selection through sharing scheme and bus rail
- Auto-configuration for compatible sharing schemes based on your selected hardware
- Launches directly from the System Recommendation Tool with your system pre-loaded
- Designed for both professional installers and advanced DIY users
PV String Size Calculator
Optimize Your Solar Array for Fortress Power Systems
Properly sizing your PV string is critical to getting the most out of a Fortress Power battery storage system. The Fortress Power PV String Size Calculator helps solar installers determine the optimal number of panels per string based on your inverter specifications, module characteristics, and local temperature conditions. Avoid overvoltage issues, maximize energy harvest, and ensure your solar array is fully compatible with your Fortress Power inverter before the job starts.
- Compatible with all Fortress Power inverter models
- Calculates minimum and maximum string sizes based on inverter voltage window
- Accounts for temperature coefficients and local climate conditions
- Helps prevent overvoltage and undervoltage string configurations
- Ideal for both new installations and system expansions