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EG4 Hybrid Inverter Energy Storage Bundle — 15.36kWh LiFePO4 System

15.36kWh LiFePO4 Storage Paired with Your Choice of EG4 Hybrid Inverter

15.36kWh LiFePO4 storage — Three 5.12kWh batteries for reliable off-grid power
Choose your inverter — EG4 18kPV or FlexBoss21 for your setup
Scale to 160kW output — Parallel up to 10 units as needs grow
Built-in safety protections — Rapid shutdown, ground fault, and arc-fault protection
  • FREE System Design Consultation -- Our engineers size your system for your actual consumption
  • FREE Shipping -- LTL freight included, no surprise charges
  • Compatibility Guarantee -- Components pre-vetted to work together

Price range: $7,731.95 through $11,000.95

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EG4 Hybrid Inverter Energy Storage Bundle
EG4 Hybrid Inverter Energy Storage Bundle
$7,731.95 – $11,000.95Price range: $7,731.95 through $11,000.95

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In the box

  • EG4 18kPV or FlexBoss21 Hybrid Inverter
  • 3 x Pytes V5 LiFePO4 Battery (5.12kWh each)
  • Pytes V-BOX-OC Outdoor Cabinet or Battery Brackets
  • Optional EG4 GridBOSS MID V3 Service Entrance
EG4 Hybrid Inverter Energy Storage Bundle
EG4 Hybrid Inverter Energy Storage Bundle — 15.36kWh LiFePO4 System
$7,731.95 – $11,000.95Price range: $7,731.95 through $11,000.95

15.36kWh LiFePO4 Storage Paired with Your Choice of EG4 Hybrid Inverter

Gain greater control over your power system with this solar storage package, pairing three Pytes V5 LiFePO4 batteries — 15.36kWh total at 51.2V — with your choice of EG4 hybrid inverter. Built for off-grid and hybrid applications, the EG4 FlexBoss21 delivers 21kW PV input across three MPPTs and parallels up to 10 units for 160kW output. The EG4 18kPV offers the same grid-independent flexibility. Choose indoor racking or the Pytes V-BOX-OC weatherproof outdoor cabinet, with an optional EG4 GridBOSS MID for 200A service entrance integration.

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15.36kWh LiFePO4 Storage
21kW PV Input Capacity
Rapid Shutdown Safety
Indoor or Outdoor Mounting
15.36kWh
Total LiFePO4 Capacity
21kW
Maximum PV Input
160kW
Parallel Output (10 Units)
No More Incompatible Components or Grid-Tied Dead Zones

No More Incompatible Components or Grid-Tied Dead Zones

Most off-grid buyers piece together inverters, batteries, and racking from different vendors, then discover the BMS won't communicate with the charge controller — or worse, they install a grid-tied system that goes completely dark the moment the utility fails. This bundle eliminates that risk entirely. Every component in this package is pre-vetted to work together: the Pytes V5 LiFePO4 batteries communicate seamlessly with your chosen EG4 hybrid inverter, the racking is sized for the cells, and the optional GridBOSS MID handles your service entrance without guesswork. You don't need to be an engineer — because we already did that work.

Expand From 15kWh to a Full Homestead Power Plant

Expand From 15kWh to a Full Homestead Power Plant

Three Pytes V5 LiFePO4 batteries give you 15.36kWh of lithium iron phosphate storage at 51.2V — enough for critical loads through the night or several days of limited sun. When your consumption grows, this architecture supports parallel expansion up to 10 inverter units, pushing total output to 160kW. That's not a theoretical ceiling on a datasheet. It's the same modular path other off-grid proven systems use to scale from a cabin starter rig to a full homestead power plant. Add batteries, add inverters, keep the same integration — no redesign required.

Rapid Shutdown Protection With Real-Time System Monitoring

Rapid Shutdown Protection With Real-Time System Monitoring

This bundle includes built-in safety that serious off-grid installers demand: rapid shutdown capability, ground fault detection, and arc-fault protection integrated directly into the inverter platform. These aren't add-on modules — they're standard. The EG4 hybrid inverter also supports remote monitoring through EG4 software with mobile alerts, so you track your state of charge, solar input, and load draw from anywhere. Whether you're 200 feet from your power shed or 200 miles away at work, you know exactly what your system is doing without walking outside to check a display.

Is This Bundle Right for Your Build?

This bundle is field-tested for serious energy storage. Confirm your setup meets these requirements before ordering.

  • 48V split-phase electrical system required
  • PV array sized up to 21kW input capacity
  • Space for 3 x Pytes V5 batteries plus inverter mounting

Designed For Real-World Scenarios

This bundle handles the loads that matter — not just lights and phones.

Whole-home backup during extended grid outages
Off-grid homestead with heavy loads like 5-ton AC
Hybrid grid-tied system with solar export capability

Full specifications

At a glance

Dimensions
See product page
Warranty
See product page
Compliance
See product page
Full specifications15 data points across 4 categories

Dimensions

Inverter DimensionsSee product page
Battery DimensionsSee product page
Outdoor CabinetPytes V-BOX-OC (optional)

Power & Performance

Battery ChemistryLithium Iron Phosphate (LiFePO4)
Battery Capacity (per unit)5.12kWh | 51.2V | 100Ah
Total Battery Capacity15.36kWh (3 x Pytes V5)
PV Input (FlexBOSS21)21kW
Inverter Output48V Split Phase
Parallel ExpansionUp to 10 units for 160kW output
MPPTsThree (FlexBOSS21)
Safety FeaturesRapid shutdown, ground fault, arc-fault protection

Materials

Battery EnclosureSee product page
RackingPytes V5 LFP Battery Brackets | Pair or Pytes V-BOX-OC Outdoor Cabinet

Compliance & Warranty

WarrantySee product page
CertificationsSee product page

The Off Grid Vault Promise

Every component in this bundle is pre-vetted to work together. No guessing, no incompatible parts.

Free System Design ConsultationOur engineers size your system for your actual consumption — no guesswork, no incompatible components.
30-Day Performance GuaranteeIf it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Compatibility GuaranteeEvery component in this package is specced to work together. We stand behind the system architecture.
★★★★★
“I swapped from a grid-tied setup that went dead during a 3-day ice storm. This EG4 and Pytes bundle was exactly what I needed — 15kWh of LiFePO4 storage, the FlexBoss21 runs my well pump and fridge without flinching, and the remote monitoring means I check my state of charge from my phone. Off Grid Vault's team confirmed my wiring plan before I ordered. No guesswork, no incompatible parts. This is the system I should have built first.”
F
First L.Prescott, AZ

Pytes V5 Battery | EG4 Hybrid Inverter Energy Storage Bundle

Gain greater control over your power system with this high-performance solar storage package, pairing the Pytes V5 LiFePO4 battery with your choice of EG4 hybrid inverter. Designed for both off-grid and hybrid applications, this solution delivers flexible scalability, smooth system integration, and dependable, advanced performance to match your energy needs.

Includes: 1 x EG4 18kPV Hybrid Inverter OR 1 x EG4 FlexBoss21 16kw AC Hybrid Inverter, 6 x Pytes V5 LFP Battery Brackets | Pair OR 1 x Pytes V-BOX-OC Outdoor Cabinet, 3 x Pytes V5 LiFePO4 Battery | 5.12kWh | 51.2V | 100Ah | Lithium Iron Phosphate, OPTIONAL 1 x EG4 GridBOSS MID V3 | 200A Service Entrance


EG4 FlexBOSS21 (V1.1) Hybrid Inverter | 48V Split Phase | 21kW PV Input

The EG4 FlexBOSS21 Hybrid Inverter provides 48V split-phase output and supports up to 21kW of solar input, combining powerful performance with flexible system design and intelligent monitoring tools for efficient energy control.

  • 21kW PV input, powers heavy loads like a 5-ton AC
  • Expandable: Parallel up to 10 units for 160kW output
  • Off-grid, grid support, or grid power export
  • Three MPPTs for optimized solar efficiency
  • Remote monitoring with EG4 software and mobile alerts
  • Seamless integration with GridBOSS ESS
  • Safety: Rapid shutdown, ground fault, arc-fault protection
  • Compact and durable design for long-term use
  • UL 1741 certified for safety and reliability
  • 10-year warranty covering key components

EG4 18kPV Hybrid Inverter | EG4-18kPV-12LV | 48V Split Phase 120/240VAC | UL1741, CEC

This advanced hybrid inverter merges grid-connected and off-grid capabilities into a single system, removing the need for external charge controllers or transformers. The result is a streamlined, self-sufficient power solution that also carries a wide range of certifications and compliance approvals to meet common electrical code requirements.

  • 18,000W PV input, 12,000W continuous output
  • Stackable with parallel units
  • Closed loop communication with EG4 batteries
  • Overload, short circuit, and over-temperature protection
  • Line balancing
  • Plug-and-play installation
  • Manages power from energy storage and grid simultaneously
  • 120/240V split phase
  • Fully outdoor rated (avoid direct sunlight)
  • ETL & cETL certified


Pytes V5 5.12kWh LiFePO4 Battery (51.2V, 100Ah)

The Pytes V5 LFP battery is a modern lithium iron phosphate energy storage solution built for dependable performance in residential, light commercial, and similar applications. Operating at a nominal 51.2V with a 100Ah capacity, it provides 5.12kWh of usable energy to support solar systems and help minimize dependence on utility power.

  • Reliable lithium iron phosphate chemistry for long-lasting performance
  • Built-in self-heating for cold environments
  • Scalable—stack up to 16 units for expanded energy storage
  • UL 9540 compliant when paired with EG4 18kPV inverter


Your Satisfaction with EG4 is Guaranteed:

  • Lowest Price Guarantee

Additional information

Inverter Options

EG4 18kPV Hybrid Inverter, EG4 FlexBoss21 16kw AC Hybrid Inverter
Racking Options

1 x Pytes V-BOX-OC Outdoor Cabinet, 6 x Pytes V5 LFP Battery Brackets | Pair
MID Options

EG4 GridBOSS MID, No EG4 GridBOSS MID

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Frequently Asked Questions

If you're currently paying $250/month to the utility, this system pays for itself in roughly 2.6 years. After that, that $250 stays in your pocket every month — $3,000 per year, indefinitely. Unlike a grid-tied system that only reduces your bill and goes dark during outages, this off-grid proven bundle eliminates the bill entirely and keeps your home powered no matter what the grid does. The LiFePO4 chemistry delivers 10+ years at 80% capacity, so you're looking at well over a decade of utility-free power.
Off Grid Vault is an authorized dealer for EG4 and carries Pytes products through verified distribution channels. When you buy from us, warranty claims go through us — not through a ticket queue on a marketplace. You receive full manufacturer warranty coverage on the inverter, batteries, and optional GridBOSS MID. We stand behind every component in this bundle because we specced it to work together. If something fails, you call us and we handle it directly.
That depends on your specific daily kWh consumption and peak surge wattage. With 15.36kWh of LiFePO4 storage and your choice of 18kPV or FlexBoss21 inverter, this bundle handles substantial residential loads — but the right configuration depends on your actual usage. That's why every Off Grid Vault bundle includes a free system design consultation. Tell us your consumption, your appliances, and your setup, and our engineers will confirm whether this package fits your needs or recommend the correct configuration.
Lithium iron phosphate delivers significantly longer cycle life — typically 6,000+ cycles at 80% depth of discharge compared to 500–1,500 cycles for AGM and 2,000–3,000 for standard lithium-ion. LiFePO4 also handles higher temperatures without thermal runaway risk, maintains stable voltage under load, and weighs substantially less than lead-acid equivalents. For an off-grid system you're relying on for years, LiFePO4 is the chemistry that matches the investment. The Pytes V5 cells in this bundle are built for that kind of long-term service.
This bundle ships free via LTL freight. Lead time depends on current stock, but we don't inflate timelines — we give you the real number when you order. Installation complexity depends on your existing electrical setup and whether you choose the outdoor cabinet or indoor brackets. For most intermediate-level installers comfortable working with 48V systems, this is a straightforward build. If you need guidance, our free system design consultation covers the installation plan before your equipment arrives.
Yes. Finance with Affirm — pay as low as $644/month on approved credit. You can also split the purchase into 4 interest-free payments with Klarna. At $644/month, this system costs less than many utility bills — and unlike your utility bill, those payments stop. We show financing upfront because serious off-grid equipment is a significant investment, and you should have clear options. No hidden fees, no surprise freight charges — the price you see is the price you pay, with free shipping included.
SKU: BNDL-E0024-21-1-NO Category: Brand:

The Off Grid Vault Promise

Every component in this bundle is pre-vetted to work together. No guessing, no incompatible parts.

Free System Design Consultation Our engineers size your system for your actual consumption — no guesswork, no incompatible components.
30-Day Performance Guarantee If it doesn't perform as specified, we make it right — uninstalled returns accepted within 30 days.
Compatibility Guarantee Every component in this package is specced to work together. We stand behind the system architecture.

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About eg4 Inverter Bundle

eg4 is a trusted manufacturer of premium inverter bundle. OffGridVault is an authorized dealer offering the full eg4 lineup with free delivery, price match guarantee, and expert support.

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