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- Regular price
- $6,460.00
- Regular price
- $6,460.00
✅ 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.
🏔️ OffGrid Horizon is family-owned & off-grid obsessed. Read our story →
Shipping: how fast & how it works
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?
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
BigBattery and EG4 orders of $5,000 or more qualify for $250 off, applied automatically at checkout. No discount code required.
The step-up configuration: stackable BigBattery ETHOS LiFePO4 batteries paired with the EG4 FlexBOSS21 hybrid inverter — 21 kW of PV input and 16 kW of split-phase AC output with four MPPTs, scalable design, and remote Wi-Fi monitoring. Configure 10.24 kWh to 30.72 kWh of storage to match your backup goals.
What's in the kit
- 1 × EG4 FlexBOSS21 hybrid solar inverter (21 kW PV / 16 kW AC, split-phase, 4 MPPT)
- Your choice of 2, 3, 4, or 6 × BigBattery ETHOS 48V 5.12 kWh LiFePO4 battery modules
Key features
- Higher AC output: 16 kW split-phase output for larger homes and heavier simultaneous loads.
- Four MPPT inputs for complex arrays across multiple orientations.
- Safety-certified battery platform: ETHOS modules are built on UL1973-listed cells with UL9540A-tested design.
- Remote monitoring: app-based visibility of production and battery state via Wi-Fi.
- Scalable: add ETHOS modules over time as your storage needs grow.
Good to know
Select your storage capacity from the Battery Configuration menu — pricing shown is for the complete kit. Ships by freight carrier; delivery timing is confirmed once your order is accepted. Professional installation by a licensed electrician is recommended.