INVERTERS
EG4 12000XP Off-Grid Inverter $2589.89
The EG4 12000XP is a powerful, all-in-one off-grid inverter designed for residential, commercial, and remote applications. With a 12kW output and surge capacity up to 18kW, it supports high-demand appliances while maintaining high efficiency through dual MPPT tracking and 99% MPPT performance. Its 480VDC input minimizes cabling and enables up to 24kW PV input without a combiner box.
Engineered for smart energy management, it offers closed-loop communication with EG4 batteries, plug-in Wi-Fi for remote monitoring, and NEC 690.12-compliant rapid shutdown capabilities. Built tough for durability and safety, it operates in a wide temperature range and includes built-in protections against polarity, over-voltage, and surges.
Whether powering a home, remote cabin, or commercial site, the EG4 12000XP delivers reliable, scalable off-grid power with 5-year warranty-backed confidence.
EG4 18kPV All-In-One Hybrid Inverter $4898.00
The EG4 18kPV Hybrid Inverter delivers a powerful, all-in-one energy solution, seamlessly combining off-grid independence with grid-tied reliability. With up to 18,000W PV input and 12,000W of continuous output, it intelligently manages power from solar, battery, and grid sources—simultaneously and efficiently.
Ideal for homes, RVs, and backup systems, it features closed-loop communication with EG4 batteries, built-in protections, and fully remote monitoring. Its outdoor-rated, plug-and-play design ensures easy setup, while certifications like UL1741SB, Rule 21, and CEC listing guarantee full code compliance.
From real-time solar performance to firmware upgrades, the EG4 18kPV offers unmatched flexibility, resilience, and control—perfect for any solar project that demands performance without compromise.
EG4 FlexBOSS21 (V1.1) Hybrid Inverter $4199.00
The EG4 FlexBOSS21 is a powerful 48V split-phase hybrid inverter designed for maximum flexibility and performance. With 21kW PV input, the FlexBOSS21 can run large loads—like a 5-ton AC—and scales up to 256kW when paralleled with up to 16 units. Three MPPTs and closed-loop battery communication ensure optimal energy management, while full Wi-Fi monitoring allows remote access, alerts, and control.
Fully compliant with UL1741 and CEC standards, the FlexBOSS21 supports off-grid operation, grid support, and grid sell-back. Built-in safety features include rapid shutdown, AFCI, and ground fault protection. For complete system integration, it pairs seamlessly with EG4’s GridBOSS breaker system and Energy Storage Solutions (ESS).
With a 10-year warranty and robust design, the FlexBOSS21 is ideal for demanding residential or commercial solar applications where scalability and control matter most.
EG4 FlexBOSS18 Hybrid Inverter $3499.99
The EG4 FlexBOSS18 delivers professional-grade hybrid solar performance at an accessible price—perfect for both installers and DIY users. With 13kW continuous output (PV), 18kW solar input, and 10kW battery-only output, it’s built to handle demanding energy needs while reducing grid reliance.
This 48V split-phase inverter seamlessly integrates with EG4 batteries and pairs with the EG4 GridBOSS MID to streamline installation and enable advanced features like time-of-use optimization, load shifting, and prioritized backup power—all without extra breakers or transfer switches.
Certified to UL1741 standards, the FlexBOSS18 ensures safety and code compliance, making it a powerful, affordable choice for both residential and commercial hybrid solar systems. Experience flexible energy control and long-term reliability with the EG4 FlexBOSS18.
BATTERIES
EG4 WallMount Indoor 48V 280Ah Lithium Battery $3299.99
The EG4 WallMount Indoor Battery is a high-capacity 14.3kWh LiFePO₄ solution tailored for residential indoor energy storage. With over 8,000 cycles at 80% depth of discharge and a 15+ year design life, it offers dependable, long-term performance. A smart BMS ensures real-time monitoring, passive balancing, and advanced safety, including dual fire arrestors and an emergency stop feature.
Built for seamless integration, it includes a touchscreen display, internal 600A busbars, and closed-loop communication with EG4, Victron, Sol-Ark, and other leading inverters. Its self-heating capability ensures reliable operation in cold environments, while the optional EG4 conduit box provides a sleek plug-and-play connection to EG4 inverters.
Certified to UL1973 and UL9540A standards and backed by a 10-year warranty, the WallMount Indoor Battery delivers safe, scalable, and intelligent energy storage for modern solar systems.
EG4 WallMount All Weather 48V 280Ah Lithium Battery $3999.99
The EG4 WallMount All Weather Battery is a robust 14.3kWh LiFePO4 energy storage solution built to deliver power and reliability in any environment. With 200A continuous output and peak delivery up to 15.4kW, it’s ideal for both off-grid and hybrid solar systems.
Engineered for durability, it features a smart BMS, dual fire arrestors, an emergency stop function, and a self-heating system to maintain performance in cold weather. Its all-weather IP65-rated enclosure and Amphenol quick connectors make it perfect for outdoor installations.
Compatible with most major inverters—including EG4, Victron, Sol-Ark, and more—it integrates easily into any setup. The optional conduit box and pairing with the EG4 18kPV inverter allow for a streamlined, maintenance-free Energy Storage System. Backed by UL1973 and UL9540A certifications and a 10-year warranty, the EG4 WallMount sets a new standard in safe, resilient energy storage.
EG4 WallMount Indoor 100Ah Lithium Battery $1649.95
Compact, reliable, and built for real-world energy demands, the EG4 WallMount Indoor 100Ah Battery delivers 5.12kWh of dependable power in a slim, space-saving design. Ideal for essential backup, off-grid living, or daily storage needs, it features a 100A continuous charge/discharge rate and over 6,000 cycles at 80% depth of discharge—ensuring performance that lasts for 15+ years.
Engineered for seamless indoor installation, it integrates effortlessly with EG4 inverters like the 6000XP, 3kW, 12kPV, 18kPV, and FlexBOSS21. Quick-connect Degson terminals and optional conduit boxes simplify setup, while closed-loop communication ensures smooth inverter compatibility.
Certified to UL1973 and UL9540A standards, this battery is expandable for growing systems and ideal for compact battery banks. It’s a trusted solution for homeowners and installers seeking performance, efficiency, and peace of mind—backed by EG4’s commitment to innovation and quality.
SOLAR PANELS
Aptos 440W Bifacial Solar Panel (DNA-120-BF10-440W) $176.00EA
The Aptos 440W Bifacial Solar Panel combines cutting-edge split-cell and PERC technology to deliver up to 550W with bifacial gain. Engineered for maximum energy harvest and superior heat tolerance, it features ultra-thin 10-busbar construction for reduced resistance and optimized performance—even in high-heat conditions.
Built to last, this panel is Miami-Dade wind-load certified to 5400 Pa and performs at 3X the IEC baseline standards. The sleek, all-black design ensures aesthetic appeal, while its industry-leading 30-year product and power performance warranty guarantees long-term reliability and value.
Perfect for residential, commercial, or off-grid applications, Aptos panels deliver powerful, efficient, and durable solar solutions backed by proven performance.
Aptos 550W Bifacial Solar Panel (DNA-144-BF10-550W-DG) $225.50EA
Maximize your solar potential with the Aptos 550W Bifacial Dual Glass Solar Panel—engineered for high-output performance and long-term durability. Featuring advanced bifacial technology, this panel captures up to 25% more energy from the rear side, delivering up to 688W of total power. With 21.29% efficiency and 10 ultra-thin busbars, it ensures low resistance and high energy yield in any setting.
Built with rugged dual-glass construction, it’s rated for 5400 Pa snow loads and 4000 Pa wind loads, making it ideal for harsh environments. The sleek all-black design offers modern aesthetics for both residential and commercial installations, while its large format (89.68" x 44.6") and 71.2 lb weight are optimized for professional-grade applications.
The Aptos 550W panel is the perfect blend of power, resilience, and style—delivering cutting-edge performance for today’s most demanding solar systems.
Philadelphia Solar 430W Bifacial Panel (PS-MNB108(HCBF)-430W) $144.99EA
Engineered for peak performance and long-term reliability, the Philadelphia Solar 430W bifacial panel combines advanced N-type half-cell technology with durable construction for exceptional results. Delivering up to 430W of power with positive tolerance (0 ~ +3%), it performs efficiently even in challenging conditions.
Designed for resilience, it withstands up to 5400 Pa of front and rear mechanical loads and resists environmental stressors like dust, sand, salt mist, and ammonia. With anti-PID protection and only 0.4% annual degradation, it’s backed by a 30-year linear power warranty for unmatched reliability.
Its sleek black finish and high-efficiency half-cell design reduce current mismatch and boost output in partially shaded conditions, making it a versatile solution for residential and commercial solar projects alike.
Hyperion 405W Bifacial Solar Panel by Runergy $127.99EA
The Hyperion 405W Bifacial Solar Panel delivers dependable, high-efficiency performance with a sleek all-black design. Optimized for low-light conditions, it ensures steady energy production during cloudy days, early mornings, and late afternoons—maximizing daily yield.
Built with an anodized aluminum frame and durable glass layers, it withstands up to 2400 Pa wind and 5400 Pa snow loads. Its modern aesthetics and robust design make it ideal for residential and commercial systems where appearance and performance both matter.
Elevate your energy system with the Hyperion 405W—built for longevity, reliability, and all-day power production.
More Solar Options, Better Value
At GridStone Developments, we know that one size doesn’t fit all. That’s why we offer a wide range of high-performance solar panels—from trusted brands like Aptos, Philadelphia Solar, and Runergy—to match your specific energy goals, design preferences, and budget. Whether you’re looking for sleek all-black aesthetics, bifacial gain, or panels optimized for low-light conditions, we’ve got you covered.
Looking to buy in bulk? We offer deep discounts on pallet pricing, making it even more affordable to power larger projects or build out full systems. Reach out today to explore our inventory and find the right panels at the right price—without compromising on quality or performance.