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EG4

EG4 18kPV All-in-One Hybrid Solar Inverter | 18 kW PV / 12 kW AC | Split-Phase

SKU INV024

Regular price: $4,999.00

Regular price: $4,999.00

✅ Order by 12:00 PM EST and processing starts the same day (ships within 1–2 business days). Free, insured US shipping — delivery in 4–7 business days. Oversized items ship via LTL freight and we coordinate delivery with you by phone.

Quantity

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Shipping: how fast & how it works

Free standard shipping on every US order — no shipping charges at checkout, no hidden fees, and every shipment is insured against loss or damage.

Processing: 1–2 business days. Order before 12:00 PM EST and processing begins the same day.
Delivery: 4–7 business days via USPS, UPS or FedEx. Tracking is emailed the moment your order ships.
Large items (solar kits, batteries, shelters): delivered by LTL freight carriers such as FedEx Freight, Old Dominion or XPO. The carrier calls ahead to schedule a delivery window — please inspect the pallet and note any damage on the delivery receipt before signing, and we’ll take care of the rest.

Questions about delivery to your location? Call (302) 496-3554 (Mon–Fri, 9am–4pm EST) — we’re happy to check before you order.

What is your Return Policy?

At OffGrid Horizon, we want every customer to shop with confidence. If something doesn’t go as planned, we’ve made returns and refunds simple and fair. Here’s how it works:

1. Return Window

You can request a return within 30 days of receiving your order. Unfortunately, we’re unable to accept returns after that time frame.

2. Who Pays for Return Shipping?

If your item arrives damaged, defective, or incorrect, we’ll cover the return shipping cost — and you’ll receive a full 100% refund or replacement, including any original shipping costs.
If you’re returning an item because you changed your mind, you’ll be responsible for return shipping, and a 25% restocking fee applies.

3. Damaged or Defective Items

Received something broken or not working properly? Contact us within 30 days. We’ll provide a prepaid return label and once the item is returned and inspected, we’ll issue either a full refund or a replacement.

4. Changed Your Mind?

If you no longer want the item, you can return it within 30 days — as long as it’s unused, unopened, in its original packaging, and in resellable condition.

5. Refund Processing

Once we receive and approve your return, we’ll send a confirmation email and issue a refund to your original payment method within 7 business days. Please allow additional time for banks or credit card companies to process and reflect the refund.

How to start a return: email sales@offgridhorizon.com or call (302) 496-3554 (Mon–Fri, 9am–4pm EST) with your order number — we’ll send return instructions and your RMA right away.

Product Description

The EG4 18kPV is an all-in-one hybrid solar inverter for whole-home energy systems. It accepts up to 18 kW of solar PV input and delivers 12 kW-class split-phase AC output, handling grid-tied operation, battery charging, and backup power in a single unit. Paired with a 48V battery bank such as the BigBattery ETHOS, it forms the core of a complete home energy storage system — one enclosure managing solar, battery, grid, and generator power.

Why the 18kPV

Up to 18 kW of solar input — headroom for large rooftop or ground-mount arrays, managed by built-in MPPT charge controllers
12 kW-class split-phase 120/240V output — carries whole-home loads including 240V appliances
True hybrid operation: grid-tied self-consumption, off-grid, and battery-backup modes with seamless transfer when the grid drops
Closed-loop communication with compatible 48V LiFePO4 battery banks for accurate state-of-charge and coordinated charging
Generator input supported for extended outages

Who it's for

Homeowners building a whole-home solar-plus-storage system — whether the goal is backup power, solar self-consumption, or full energy independence. For a pre-matched system, see our ETHOS + EG4 18kPV kits with 10.24–30.72 kWh of stackable storage.

Specifications

Solar (PV) input	Up to 18 kW
AC output	12 kW-class, split-phase 120/240V
Operating modes	Grid-tied, off-grid, battery backup, generator input
Battery voltage	48V nominal
Battery communication	Closed-loop with compatible LiFePO4 banks
Form factor	Wall-mounted all-in-one
SKU	INV024

Warranty

The EG4 18kPV carries a 10-year manufacturer warranty covering parts exchanges throughout the warranty period. EG4 requires warranty registration within the first year of purchase (or proof of purchase from an authorized distributor) to keep coverage valid.

Common questions

Can it sell power back to the grid?

The 18kPV supports grid-interactive operation. Whether you can export depends on your utility's interconnection rules — your installer will handle the application and settings.

Do I need an electrician?

Yes — a hybrid inverter interconnects with your main panel and the utility. Installation should be performed by a licensed electrician, and residential energy storage installations are subject to local permitting.

Which battery should I pair it with?

Any compatible 48V LiFePO4 bank; the BigBattery ETHOS platform is the natural companion — UL1973/UL9540A-certified, stackable, and available in matched kits in the store.