The Guardian is a Wi-Fi communication dongle that connects to your Fortress Power inverter and sends system data to the Fortress Power mobile apps and cloud dashboard. It's built for homeowners and installers who need remote visibility into battery and inverter performance without walking out to the equipment room.
Note: If you would like to review the manufacturer Product Specifications, Warranty, Brochure, etc., for this system, please refer to the "Resources (System Manuals and Warranty)" Tab above on this page.
The Guardian sits at the communication layer of a Fortress Power energy storage system, not the power layer — it doesn't carry current, but the data it reports (state of charge, fault codes, power flow) is what lets you catch a developing problem before it becomes a service call. Field-verified reliability on the reporting side matters just as much as the wire gauge on the DC side, because a monitor you can't trust is a monitor you'll ignore.
- Function: Wi-Fi dongle for cloud-based monitoring and alerts on Fortress Power systems.
- Connects to: Fortress Power Envy inverters directly.
- Warranty-linked pairing: Required alongside Envy inverter and eForce battery for the extended 15-year eForce ESS warranty to apply.
- Commissioning time: Under 10 minutes with guided setup.
- Does NOT replace the legacy Guardian Gateway hardware — it supersedes it; do not attempt to mix the two communication devices on one system without checking current compatibility documentation.
- Does NOT provide power switching, disconnect, or ampacity/current-carrying function — it is a monitoring/communication accessory only, not part of the electrical load path.
Key Benefits
- Direct connection to Fortress Power inverters for real-time cloud monitoring.
- Supports both an Owner app and a PRO installer app, so homeowners and technicians each get a role-appropriate view.
- Guided commissioning process designed to run under 10 minutes.
- Enables fleet management, alerts, and notifications across connected sites.
- Required component for unlocking the extended 15-year warranty on the eForce ESS.
| Spec | Value | Unit |
|---|---|---|
| Device Type | Wi-Fi Communication Dongle | - |
| Commissioning Time | Under 10 | minutes |
| Replaces | Guardian Gateway | - |
| SKU | GUARDIAN | - |
Note: See "Resources (System Manuals and Warranty)" Tab above for full specifications.
Compatibility & Fitment
- Fits: Fortress Power Envy inverters.
- Fits: Fortress Power eForce batteries, when paired with an Envy inverter and Guardian (required combination for the extended eForce ESS warranty).
- Also eligible per manufacturer notes: eFlex MAX and eVault batteries when paired with an Envy inverter and Guardian.
- NOT a functional replacement in older installs expecting the legacy Guardian Gateway form factor — confirm current system compatibility before swapping.
- NOT a power-handling device — carries no current and is not rated for AWG/ampacity specifications; it is a data/communication accessory only.
- NOT a substitute for the CT (current transformer) hardware needed for power-flow monitoring — one set of CTs is used alongside the Guardian for grid power flow monitoring.
| Compliance Item | Detail |
|---|---|
| UL Certifications | [NEEDS VERIFICATION] |
| IP Rating | [NEEDS VERIFICATION] |
| NEC Ampacity Applicability | Not applicable — communication/monitoring device, not a current-carrying component |
FAQ
What does the Guardian dongle actually do?
It connects directly to your Fortress Power inverter and enables secure communication between your system and the Fortress Power PRO and OWNER mobile apps, plus the cloud dashboard for monitoring and alerts.
Is this the same as the old Guardian Gateway?
No. The Guardian Wi-Fi Dongle is the current communication device for Fortress Power systems and replaces the previous Guardian Gateway hardware.
Does the Guardian affect my battery warranty?
Yes, indirectly. The extended 15-year warranty on the eForce battery is only available when it is installed as part of a complete eForce ESS that includes an Envy inverter, eForce battery, and Guardian together.
How long does setup take?
Guided commissioning is designed to run under 10 minutes, which makes it practical for straightforward commercial and industrial (C&I) deployments as well as residential installs.
What can I monitor with it?
Standard monitoring covers the cloud dashboard, AC sources and loads connected directly to the ESS through dedicated ports, one set of CTs for grid power flow, fleet management, and alerts/notifications.
Warranty & Registration
Fortress Power batteries and inverters carry a standard 10-year parts-only warranty when installed by a certified installer, covering defects in materials and workmanship. The eForce battery qualifies for an extended 15-year warranty (or 8,000 discharge cycles at 80% DoD, whichever comes first) only when installed as part of a complete eForce ESS — Envy inverter, eForce battery, and Guardian all present. A 30-year extended warranty option covering parts and labor is also available through Solar Insure, which requires installation by a Solar Insure-approved installer. Register your system or submit a warranty claim through the manufacturer's warranty portal referenced in the Resources tab above.
