The OUPES Mega 3 is designed for serious backup and off-grid use, offering a 3072Wh LiFePO₄ battery, 3600W continuous output, and expandable capacity. With rapid charging, app controls, and UPS functionality, it’s ideal for homeowners, RV travelers, and professionals who need dependable power.
Product Overview Table
| Feature | Specification |
|---|---|
| Battery Capacity | 3072Wh |
| Inverter Power | 3600W (pure sine) / 7200W surge |
| Battery Type | LiFePO₄ (>3,500 cycles to 80%) |
| Weight | 70.5 lbs |
| Charging Methods | AC (1800W fast / 900W slow), Solar (1200W MPPT), Car, AC+Solar up to 3000W |
| Expandability | Up to 10.24kWh with two B2 batteries |
| UPS/EPS | <20 ms switchover |
| Ports | 6× AC outlets, 2× USB-C (100W PD), 4× USB-A, 2× DC5521, 1× Car port |
| Dimensions | 17.9 × 10.6 × 14.9 in |
| App Control | Wi-Fi + Bluetooth (OUPES App) |
| Protection | IP21, 5-year warranty (+1 year with registration) |
Performance
The Mega 3’s 3600W continuous output and 7200W surge capacity provide enough power for heavy-duty appliances like air conditioners, power tools, and kitchen gear. Its pure sine wave inverter ensures clean electricity for sensitive electronics, while UPS/EPS mode keeps systems online during outages.
Battery & Specs
- Base capacity: 3072Wh
- Expandable: Pair with B2 batteries for 10.24kWh total
- Cycle life: 3,500+ to 80% capacity
- BMS: Protects against overload, overheating, and short-circuit
This large capacity makes it suitable for extended blackouts or multi-day off-grid adventures.
Portability & Design
At 70.5 lbs, the Mega 3 is hefty but manageable with dual handles and optional accessories like a roll cart. Its footprint of 17.9 × 10.6 × 14.9 inches is compact relative to its power class. A large LCD display and app connectivity provide real-time system monitoring.
Charging Options
The OUPES Mega 3 supports fast and hybrid charging:
- AC (Fast Mode): 1800W (~1.7 hrs)
- AC (Slow Mode): 900W (~3.5 hrs)
- Solar: 1200W MPPT (12–150V) ~2.5 hrs in ideal sun
- AC + Solar Hybrid: up to 3000W (~1.2 hrs)
- Car Input: slower charging option for travel
Price & Value
The Mega 3 sits in the high-power class, offering more wattage and capacity than the Mega 2 while remaining less expensive and lighter than the Mega 5. With expansion up to 10.24kWh and strong input/output specs, it delivers strong long-term value for both home backup and professional users.
Ideal Use Cases
- Whole-Home Backup: Keeps fridges, HVAC, and multiple appliances powered.
- RV & Off-Grid Living: Handles cooking gear, A/C, and large electronics.
- Professional Worksites: Reliable off-grid power for tools and equipment.
- Emergency Preparedness: Enough storage and expandability for multi-day outages.
Pros and Cons
Pros:
- 3600W continuous / 7200W surge output
- 1200W solar input + 3000W hybrid charging
- Expandable to 10.24kWh
- App control (Wi-Fi + Bluetooth)
- UPS/EPS <20 ms
Cons:
- Heavy at 70+ lbs
- IP21 rating (indoor/covered use only)
- Higher price than smaller Mega units
Final Verdict
The OUPES Mega 3 is a powerhouse in the portable backup category. With its 3600W output, large 3072Wh LiFePO₄ battery, and expansion capability, it’s an excellent choice for families, RV travelers, and professionals needing robust and scalable power.
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FAQs
Does the OUPES Mega 3 support UPS?
Yes, it has <20 ms switchover for continuous backup.
How expandable is the Mega 3?
It can be paired with two B2 batteries for a total of 10.24kWh capacity.
How fast does it recharge?
With AC + solar hybrid input, recharge time can be as fast as ~1.2 hours.
What appliances can it run?
With 3600W continuous and 7200W surge, it can handle large kitchen appliances, power tools, and even A/C units.
Last update on 2026-03-07 / Affiliate links / Images from Amazon Product Advertising API