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BigBattery

BigBattery ETHOS + EG4 6000XP Off-Grid Kit | 15.36 kWh | 48V LiFePO4

SKU K0709

Regular price: $5,619.99

Regular price: $5,619.99

✅ 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.

Product variants

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OffGrid Horizon Family Owned and Operated

🏔️ OffGrid Horizon is family-owned & off-grid obsessed. Read our story →

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

A compact off-grid starter system: three stackable BigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — 15.36 kWh in a single tower — paired with the EG4 6000XP split-phase off-grid inverter. Ideal for cabins, tiny homes, and essential-loads backup where floor space is at a premium but you still want real overnight capacity and room to grow.

What's in this kit

1 × EG4 6000XP off-grid inverter — an all-in-one split-phase unit: 6,000W continuous 120/240V output, dual MPPT charge controllers accepting up to 8,000W of solar, and built-in AC charging
3 × BigBattery ETHOS 48V 5.12 kWh LiFePO4 modules — 15.36 kWh of storage stacked vertically in one column
Closed-loop communication between battery and inverter for accurate state-of-charge reporting and coordinated charging

Is this the right size for you?

It fits if: you're powering a cabin, tiny home, or a defined set of backup circuits — refrigeration, lights, electronics, a water pump, and a moderate 240V load. 6,000W covers those comfortably, and 15.36 kWh typically carries an efficient small household overnight.

Size up if: you need more output for simultaneous heavy loads (see the ETHOS + EG4 12000XP V2 kit) or more storage for daily cycling — the ETHOS platform accepts additional modules, so this tower can grow after purchase.

Key features

Safety-certified battery platform: ETHOS modules are built on UL1973-listed cells with UL9540A-tested design
Small-footprint tower: three modules stack vertically in one column — no wall of batteries
All-in-one inverter: the 6000XP combines inverter, solar charging, and battery charging in one split-phase unit
Expandable later: add ETHOS modules as your needs grow

Specifications

Battery	3 × BigBattery ETHOS, 48V LiFePO4, 5.12 kWh per module
Total storage	15.36 kWh
Battery certifications	UL1973-listed cells; UL9540A-tested design
Inverter	EG4 6000XP all-in-one
Continuous output	6,000W, split-phase 120/240V
Solar (PV) input	Up to 8,000W via dual MPPT controllers
System voltage	48V
Expandable	Yes — add ETHOS modules over time

Warranty & support

Battery: ETHOS modules are covered by BigBattery's 12-year manufacturer warranty, backed by lifetime USA-based technical support. Inverter: the EG4 6000XP carries a 5-year full parts-or-product replacement manufacturer warranty; EG4 requires warranty registration within the first year of purchase (or proof of purchase from an authorized distributor) to keep coverage valid.

Common questions

Do I need an electrician?

Stacking the modules and mounting the inverter are owner-level tasks, but the AC side — panel interconnection, grounding, bonding, and code compliance — is work for a licensed electrician and typically requires a permit and inspection.

Are solar panels included?

No. The 6000XP accepts up to 8,000W of panels, which are sold separately so you can match your site. The system also runs as battery-plus-charger without solar. Pricing shown is for the complete kit.

How does LiFePO4 handle cold weather?

LiFePO4 batteries discharge reliably in freezing temperatures, but charging below freezing is restricted by the BMS to protect the cells. Install the tower in an insulated or conditioned space to keep charging available year-round.