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ETHOS + EG4 18kPV ESS · 2× Inverter / 6× Battery ("Large")
A complete, high-performance energy storage system pairing six scalable ETHOS 48V lithium battery modules with two EG4 18kPV hybrid inverters — delivering 61.44kWh of storage and 24,000W of continuous AC output in one integrated, UL 9540-certified package.
Combining the scalable ETHOS 48V lithium battery system with two EG4 18kPV hybrid inverters, this system delivers reliable, efficient, and intelligent energy management for both on-grid and off-grid applications. Expandable well beyond this configuration, the ETHOS battery adapts to growing energy needs while the 18kPV inverters seamlessly manage power from solar, battery storage, and the grid.
Designed with UL 9540-certified configurations, advanced battery management, and U.S.-engineered components, this system ensures safe, maintenance-free performance with seamless closed-loop communication between battery and inverter.
Ships From: Texas, USA | Warranty: 12 Years (Battery), 10 Years (Inverter) | Support: Lifetime USA-Based Tech Support
This configuration pairs 2× EG4 18kPV inverters with 6× ETHOS battery modules (the "Large" tier). Totals — 61.44kWh storage, 24,000W continuous AC output, 36,000W max combined PV input — are calculated from BigBattery's confirmed per-unit specs, since the source page doesn't state a single combined figure for this specific tier.
ETHOS Battery (Each Module)
| System voltage | 48V |
| Nominal voltage | 51.2V |
| Chemistry | LiFePO4 |
| kWh capacity | 10.24 kWh |
| Ah capacity | 200 Ah |
| Charging voltage range | 55.6–57V |
| Max charge voltage | 57V |
| Operating voltage range | 48–57V |
| Suggested low-voltage cutoff | 48–50.8V |
| BMS cutoff range | 42–47V |
| Cell configuration | 16S 2P |
| Max continuous discharge current | 200A |
| Max continuous power | 10,240W |
| Max discharge peak current | 300A (5s max) |
| Max charge current | 200A |
| Charge temperature range | 32°F–113°F (0°C–45°C) |
| Discharge temperature range | -4°F–140°F (-20°C–60°C) |
| Weight | 273 lb (123.8 kg) |
| Dimensions (D×W×H) | 6.7 × 26.5 × 43.3 in |
| Max parallel connections | Up to 16 per control box |
| Protection rating | IP65 / NEMA 4X |
| Certifications | UL9540, UL9540A, UL1973, UN38.3 |
EG4 18kPV Inverter (Each Unit)
| AC voltage | 120V / 240V AC |
| AC frequency | 50 / 60 Hz |
| Max continuous AC current | 50A @ 240V AC |
| Max AC input power | 12,000W |
| Output power | 12,000W |
| Max AC bypass | 200A |
| Surge capacity (with PV) | 14,700W (10min) / 15,500W (5min) |
| Power factor | 0.99 (full load) |
| Total harmonic distortion | < 5% (full load) |
| Transfer time | 10–20ms (single) / 20ms (parallel) |
| Number of MPPTs | 3 |
| DC input voltage range | 100–600V DC |
| MPPT operating voltage range | 140–500V DC |
| Max PV array power | 18,000W |
| Max efficiency | 94–99.9% |
| Battery voltage range | 40–60V DC |
| Max charge/discharge current | 250A |
| Operating/storage temp. | -13°F–140°F (-25°C–60°C) |
| Protection rating | IP65 / NEMA 4X |
| Communications | RS485 / CANBus / WiFi |
| Weight | 121 lbs (55 kg) |
| Dimensions (D×W×H) | 11.2 × 20.5 × 34.3 in |
Free shipping on all orders within the mainland US (Hawaii, Alaska and overseas territories excluded - a freight forwarder is required). Orders ship directly from our brand partners' warehouses across the U.S. Order confirmation is emailed immediately; if an item is unexpectedly backordered we notify you before your card is charged. In-stock items are processed within 1-4 business days (cut-off 4:00 PM EST), transit is 3-6 business days, and tracking is emailed within 24 hours of shipment. Typical delivery is 4-10 business days from purchase. Minimum order value is $69.
You have 30 days from the delivery date to initiate a return (35 days for orders placed Nov 25-30 and Dec 25-31). Items must be unused, in original packaging with tags attached, and returns require prior authorization from our team.
To start a return: +1 (307) 317-7213, hello@ecosolarkits.com, or live chat. Read the full return and refund policy
