Fortress Power
Fortress Power is a US-based LFP battery energy storage system manufacturer founded in 2016, serving residential, commercial, and industrial customers through 500+ certified installers, 100+ distributors, and direct C&I sales across North America and the Caribbean.
- Company typePrivate
- Founded2016
- HeadquartersLanghorne, United States
- Headcount101–250
- GTM typeB2B
- OfferingHardware or Manufacturing
What Fortress Power does
Fortress Power, founded in 2016 and headquartered in Langhorne, Pennsylvania, is a privately held manufacturer of lithium iron phosphate (LFP) battery energy storage systems serving residential, commercial, and industrial (C&I) customers across North America and the Caribbean. The company's product portfolio spans stackable residential batteries (eForce 9.6 kWh, eBoost 16 kWh, eFlex MAX 5.4 kWh, eVault MAX 18.5 kWh), a full line of hybrid inverters (Envy Duo 21, Envy True 12 kW, Envy 8/10 kW, Solo 6.5K, EdgeOn Duo 9/15), and commercial systems (eSpire Nano, eSpire Mini, eSpire 290FC, eSpire 306). Underlying technology centers on automotive-grade LFP cells with integrated battery management, supported by the Guardian Wi-Fi dongle, cloud monitoring, mobile apps, and the Keystone EMS energy management platform for C&I facilities.
The company operates a two-tier go-to-market model: a channel network of 500+ certified installers and 100+ distributors handles residential and SMB volume, while a dedicated C&I division pursues direct enterprise sales for demand-charge reduction, backup power, and grid services use cases. Revenue is generated primarily through hardware sales, with ancillary recurring streams from extended warranty programs (up to 30 years via SolarInsure) and the EnergyBroker virtual power plant program available in 15 US states plus Puerto Rico. Fortress Power received private equity backing from White Deer with MB Energy Partners participating in January 2022 to fund market expansion and new product development, and has subsequently launched the eBoost, Envy Duo 21/Solo 6.5K, and eSpire Nano product lines while establishing distribution operations in Puerto Rico and Mexico.
Fortress Power firmographics
Firmographics- Name
- Fortress Power
- Legal name
- Fortress Power
- Website
- https://fortresspower.com
- Company type
- Private
- Founded year
- 2016
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Fortress Power is a US-based LFP battery energy storage system manufacturer founded in 2016, serving residential, commercial, and industrial customers through 500+ certified installers, 100+ distributors, and direct C&I sales across North America and the Caribbean.
- Ownership category
- akta.pro rank
Fortress Power industry classification
Industry- Product category
- Energy Storage Systems
- NAICS
- Battery Manufacturing (33591)
- SIC
- Electronic & Other Electrical Equipment (No Computer Equip) (3600)
- akta.pro primary industry
- Battery Modules & Packs (Industrial/Commercial pack assembly) (IMAGAHAB)
- akta.pro secondary industries
- Residential / Behind-the-Meter Storage Installation & Integration (EUAEAEAC), Energy Storage Balance-of-Plant (enclosures, switchgear, protection, metering) (IMAGAHAK), Battery Management Systems (BMS) & Safety Controls (EUAFAAAD)
Keywords
Where Fortress Power is headquartered
LocationHeadquarters
- HQ city
- Langhorne
- HQ country
- United States
- HQ region
- North America
Offices3 records
Markets served
Fortress Power business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Technology or R&D, Personnel, Marketing or Sales, Infrastructure
Revenue model
- Battery and Inverter Hardware Sales: Primary revenue from selling LFP battery storage systems, hybrid inverters, and accessories to certified installers, distributors, and directly to commercial/industrial customers. Products include eForce, eBoost, eFlex, eVault, eSpire series batteries, and Envy/Solo/EdgeOn inverters.
- Training and Certification Services: Revenue generated through the Certified Installer Program, providing training portal access, technical education, webinars, and in-person training sessions to installer partners.
- Extended Warranty Programs: Optional extended warranty coverage (up to 30 years) through SolarInsure partnership, providing additional recurring revenue stream and customer protection plans.
Go-to-market motion2 records
Distribution channels5 records
Marketing channels7 records
Fortress Power product offering
Product offeringCore offering
Fortress Power designs and manufactures lithium iron phosphate (LFP) battery energy storage systems, hybrid inverters, and monitoring accessories for residential, commercial, and industrial solar-plus-storage applications. Products include the eBoost, eForce, eFlex MAX, eVault MAX residential batteries, the Envy and Solo hybrid inverter lines, and the eSpire series of commercial energy storage systems. The company sells primarily through a certified installer and distributor network, complemented by direct commercial and industrial project sales, and supports its systems with cloud monitoring (Guardian), an energy management platform (Keystone EMS), and a virtual power plant program (EnergyBroker).
Product overview
Fortress Power offers a comprehensive portfolio of lithium iron phosphate (LFP) battery energy storage systems and hybrid inverters for residential, commercial, and industrial applications. The product lineup is organized into three main categories: (1) Residential batteries including the eBoost (16kWh stackable), eForce (9.6kWh stackable whole-home), eFlex MAX (5.4kWh), and eVault MAX (18.5kWh); (2) Hybrid inverters including Envy Duo 21 (scalable to 120kW), Envy True 12kW, Envy 8kW/10kW, Solo 6.5K (non-export), and EdgeOn Duo 9/15; and (3) Commercial & Industrial solutions including eSpire Nano, eSpire 290FC, eSpire Mini, and eSpire 306 energy storage systems. The ecosystem is supported by accessories (DuraRack enclosures, FlexTower enclosures, Guardian Wi-Fi Dongle), the Keystone EMS energy management system for C&I facilities, and the EnergyBroker Virtual Power Plant program. The Fortress Power Owner and Pro mobile apps provide system monitoring and management. The company also offers installer tools including a Battery & Inverter Wiring Validator, PV String Size Calculator, and System Recommendation Tool.
Differentiator
Problem solved
Functional benefit
Brands
- EnergyBroker: A program that allows system owners to earn money through upfront and ongoing incentives from local utility providers by participating in virtual power plant programs. Currently available in 15 states plus Puerto Rico.
- Guardian
Quantifiable outcome
- Up to 70% of commercial utility bills can be attributed to demand charges; battery storage helps reduce these charges
- +4 more outcomes
Companies that use Fortress Power
Customer profileNamed customers5 records
Segments4 records
Ideal customer profiles4 records
Fortress Power technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Fortress Power partnerships and signals
Strategic signalPartnerships
Two partnerships are on record, tiered core and notable.
- SolarInsurecoreWarranty provider partnership offering extended coverage options up to 30 years for Fortress Power battery systems, providing customers with long-term protection and Fortress Power with recurring revenue from warranty programs.
- Great Canadian SolarnotableEdmonton-based solar company using Fortress Power batteries in their mobile Solar Sea Can off-grid energy solution for construction sites, oil fields, mining operations, and emergency response applications.
Scale indicators4 records
Recent moves6 records
Expansion highlights6 records
Fortress Power competitors and assessment
Company assessmentDirect peers
- Sonnen (Shell): Sonnen manufactures LFP-based residential and small commercial battery systems (sonnenCore, sonnenPro) with integrated EMS and grid services participation. Owned by Shell, it is a direct competitor to Fortress Power's premium residential and C&I offerings.
- SimpliPhi Power: SimpliPhi Power manufactures LFP battery storage systems for residential, commercial, and military applications. It directly competes with Fortress Power's eSpire and eVault product lines in off-grid, backup, and C&I markets.
- Tesla Energy: Tesla's Energy business (Powerwall, Megapack) is the most direct competitor to Fortress Power, offering LFP/NMC residential and C&I battery storage with integrated inverters, monitoring, and a virtual power plant program (Tesla Virtual Power Plant). They compete head-to-head in residential backup and time-of-use applications.
- Generac Power Systems: Generac's PWRcell and ecobee-branded storage systems compete with Fortress Power in residential backup and C&I applications. Generac is a broader incumbent in home backup power (generators + batteries) and shares the same installer/dealer channel.
- Enphase Energy: Enphase's IQ Battery series (LFP-based) competes directly with Fortress Power's eForce/eVault in residential solar-plus-storage. Enphase also sells microinverters and a full monitoring platform, mirroring Fortress's integrated stack approach and competing for the same installer base.
- FranklinWH: FranklinWH offers a whole-home LFP battery system (aPower) with integrated inverter and energy management (aGate), directly competing with Fortress Power's eForce and eVault lines in the residential solar-plus-storage market.
- HomeGrid Energy: HomeGrid Energy manufactures LFP battery systems (e.g., Stack'd Series) and competes with Fortress Power in residential and light commercial storage, particularly through solar installer channels in North America.
Broad incumbents
- SolarEdge Technologies: SolarEdge, a major solar inverter manufacturer, has expanded into residential battery storage (Energy Bank) and offers an integrated solar+storage solution. It competes with Fortress Power indirectly through installer relationships and product overlap in residential solar ecosystems.
- Canadian Solar (CSI Solar / e-STORAGE): Canadian Solar's e-STORAGE subsidiary manufactures utility-scale and C&I battery energy storage systems with LFP chemistry, directly competing with Fortress Power's eSpire product line in the commercial and industrial segment.
Emerging players
- Pika Energy: Pika Energy manufactures residential battery storage and energy management systems, competing with Fortress Power in the residential solar-plus-storage segment. It has a smaller market presence but overlapping product features.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks6 records
Key highlights7 records
Customer concentration
Fortress Power social profiles
Digital presenceFortress Power financial estimates
Financial estimateRevenue estimate
Valuation estimate
Fortress Power leadership team
Management profileNumber of profiles
Profiles3 records
Fortress Power funding detail
Funding detailFunding overview
Funding rounds1 record
Investors2 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Fortress Power M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Fortress Power
What does Fortress Power do?
Fortress Power designs and manufactures lithium iron phosphate (LFP) battery energy storage systems, hybrid inverters, and monitoring accessories for residential, commercial, and industrial solar-plus-storage applications. Products include the eBoost, eForce, eFlex MAX, eVault MAX residential batteries, the Envy and Solo hybrid inverter lines, and the eSpire series of commercial energy storage systems. The company sells primarily through a certified installer and distributor network, complemented by direct commercial and industrial project sales, and supports its systems with cloud monitoring (Guardian), an energy management platform (Keystone EMS), and a virtual power plant program (EnergyBroker).
Is Fortress Power a public or private company?
Fortress Power is a private company. It is classified as private equity controlled and is currently operating.
When was Fortress Power founded?
Fortress Power was founded in 2016. It employs 101 to 250 people.
Where is Fortress Power based?
Fortress Power is headquartered in Langhorne, United States, in the North America region.
How does Fortress Power make money?
Three revenue lines are on record. Battery and Inverter Hardware Sales are the primary driver. The others are training and Certification Services and extended Warranty Programs.
Who are Fortress Power's main competitors?
Direct peers on record are Sonnen (Shell), SimpliPhi Power, Tesla Energy, Generac Power Systems, Enphase Energy, FranklinWH and HomeGrid Energy. Broad incumbents are SolarEdge Technologies and Canadian Solar (CSI Solar / e-STORAGE). Pika Energy is listed as an emerging player.
Does Fortress Power have an API?
No public API is recorded for Fortress Power.
What industry is Fortress Power in?
Fortress Power's product category is Energy Storage Systems. Its primary akta.pro industry code is IMAGAHAB, Battery Modules & Packs (Industrial/Commercial pack assembly), with a secondary code of EUAEAEAC, Residential / Behind-the-Meter Storage Installation & Integration. Its NAICS code is 33591 and its SIC code is 3600.