Enphase IQ Battery 5P vs EG4 WallMount All Weather 314Ah
The EG4 WallMount All Weather 314Ah wins this battery comparison by a decisive margin. It delivers 16 kWh of usable storage with 10.24 kW continuous output and a 10,000-cycle rating. The 11.0 kWh capacity advantage provides 15 additional hours of essential-load backup.
Key Differences
- • EG4 WallMount All Weather 314Ah provides 16 kWh vs 5 kWh usable capacity.
- • Enphase IQ Battery 5P achieves 96% round-trip efficiency vs 95%.
- • Enphase IQ Battery 5P offers a longer 15-year warranty vs 10 years.
- • EG4 WallMount All Weather 314Ah is rated for 10,000 cycles vs 8,000.
Specifications Breakdown
Usable Storage Capacity
The Enphase IQ Battery 5P provides 5 kWh of usable capacity (5 kWh total, 100% DoD), while the EG4 WallMount All Weather 314Ah offers 16 kWh usable (16 kWh total, 100% DoD). At an average essential-load consumption rate of 750 watts, the Enphase IQ Battery 5P provides approximately 6.7 hours of backup versus 21.3 hours for the EG4 WallMount All Weather 314Ah. The EG4 WallMount All Weather 314Ah's 11.0 kWh capacity advantage translates to roughly 15 additional hours of essential-load backup during a grid outage. The Enphase IQ Battery 5P is scalable up to 8 units (40 kWh total), while the EG4 WallMount All Weather 314Ah scales up to 16 units (256 kWh total).
Power Output
The Enphase IQ Battery 5P delivers 3.84 kW continuous and 5.76 kW peak power, while the EG4 WallMount All Weather 314Ah provides 10.24 kW continuous and 12.8 kW peak. The EG4 WallMount All Weather 314Ah's higher continuous output means it can simultaneously power more demanding appliances during an outage. A central air conditioner typically draws 3-5 kW, a refrigerator 0.1-0.2 kW, and an EV Level 2 charger 7-11 kW. Peak power rating matters for motor-driven loads with high startup current, such as air conditioners, well pumps, and sump pumps. The EG4 WallMount All Weather 314Ah's 12.8 kW peak is capable of starting most residential HVAC systems.
Battery Chemistry & Cycle Life
The Enphase IQ Battery 5P uses LFP chemistry with a rated cycle life of 8,000 cycles (approximately 21.9 years of daily cycling), while the EG4 WallMount All Weather 314Ah uses LFP with 10,000 cycles (approximately 27.4 years). Both use LFP chemistry, which is considered the gold standard for residential energy storage due to its inherent safety, long cycle life, and environmental friendliness. The EG4 WallMount All Weather 314Ah's additional 2,000 cycles translates to approximately 5.5 more years of daily use before reaching the rated end of life.
Round-Trip Efficiency
The Enphase IQ Battery 5P achieves 96% round-trip efficiency versus 95% for the EG4 WallMount All Weather 314Ah. This means for every 10 kWh of solar energy stored in the Enphase IQ Battery 5P, 9.6 kWh is recoverable, compared to 9.5 kWh for the other. Over 10 years of daily cycling with 15 kWh average daily throughput, the more efficient battery saves approximately $82 in energy that would otherwise be lost as heat (at $0.15/kWh average retail rate). Higher round-trip efficiency is especially valuable in time-of-use rate environments where you are storing cheap off-peak energy for expensive peak-hour consumption.
Warranty & Long-Term Protection
The Enphase IQ Battery 5P carries a 15-year warranty, while the EG4 WallMount All Weather 314Ah offers 10 years and 122.2 MWh throughput. The Enphase IQ Battery 5P provides 5 additional years of manufacturer protection against capacity degradation and defects. Battery warranties typically guarantee the unit will retain 60-70% of original capacity by end of warranty, so the length of coverage directly impacts your financial risk over the system's lifetime.
Specification Comparison
| Specification | Enphase IQ Battery 5P | EG4 WallMount All Weather 314Ah |
|---|---|---|
| Capacity | 5 kWh | 16 kWh |
| Usable Capacity | 5 kWh | 16 kWh |
| Power Output | 3.84 kW | 10.24 kW |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Efficiency | 96% | 95% |
| Cycle Life | 8,000 | 10,000 |
| Weight | 68 kg | 140 kg |
| Warranty | 15 years | 10 years |
| Scalable | Yes | Yes |
5-Dimension Head-to-Head Analysis
1. Storage Capacity
Winner: EG4 WallMount All Weather 314AhThe EG4 WallMount All Weather 314Ah provides 16 kWh versus 5 kWh — 11.0 kWh more usable storage. At typical essential-load consumption of 0.75 kW, this equals approximately 15 additional hours of backup power. This is a substantial capacity gap.
2. Power Output
Winner: EG4 WallMount All Weather 314AhThe EG4 WallMount All Weather 314Ah delivers 10.24 kW continuous versus 3.84 kW. This is enough to run a central AC unit, refrigerator, and general household loads simultaneously. The 6.4 kW power gap significantly impacts what appliances you can run during outages.
3. Chemistry & Longevity
Winner: EG4 WallMount All Weather 314AhBoth use LFP chemistry with Enphase IQ Battery 5P at 8,000 cycles vs EG4 WallMount All Weather 314Ah at 10,000 cycles. LFP chemistry provides excellent thermal stability, long cycle life, and no cobalt dependency.
4. Round-Trip Efficiency
Winner: Enphase IQ Battery 5PThe Enphase IQ Battery 5P achieves 96% round-trip efficiency versus 95%. Over 10 years of daily cycling with 15 kWh throughput per day, the more efficient battery saves approximately 82 dollars in energy that would otherwise be lost as heat (at $0.15/kWh). The difference is moderate but compounds over the battery's lifespan.
5. Warranty Coverage
Winner: Enphase IQ Battery 5PThe Enphase IQ Battery 5P offers a 15-year warranty versus 10 years. This is among the longest battery warranties in the residential market.
Enphase IQ Battery 5P
The Enphase IQ Battery 5P is a compact, microinverter-based energy storage system featuring LFP chemistry and six embedded IQ8 microinverters for module-level monitoring and redundancy. With 96% round-trip efficiency and a 15-year warranty, it delivers industry-leading energy retention. The modular 5 kWh capacity allows homeowners to start small and expand up to 40 kWh with eight units. It integrates seamlessly with the Enphase IQ ecosystem and IQ System Controller 2 for whole-home backup.
Pros
- + Industry-leading 96% round-trip efficiency
- + Microinverter architecture provides module-level monitoring and redundancy
- + 15-year warranty is among the longest in the residential market
- + Compact form factor with straightforward wall-mount installation
Cons
- - 5 kWh base capacity requires multiple units for whole-home backup
- - Higher per-kWh cost compared to larger monolithic battery systems
EG4 WallMount All Weather 314Ah
The EG4 WallMount All Weather 314Ah is the outdoor-rated flagship battery with IP67 dust and water resistance, 16 kWh LFP capacity, and 10,000-cycle longevity. It features Bluetooth, WiFi, and RS485/CAN communication with over-the-air firmware updates via the EG4 app, built-in internal heaters for cold climates, and the same auto-addressing smart BMS as the indoor version.
Pros
- + IP67 outdoor rating — fully dust-tight and submersion-resistant
- + WiFi + Bluetooth with OTA firmware updates via EG4 app
- + 16 kWh and 10,000 cycles in a weather-proof enclosure
- + Built-in heaters enable year-round outdoor operation
Cons
- - Heaviest EG4 battery at 140 kg requires robust mounting
- - Premium pricing — highest cost in EG4 lineup
- - UL 1973 pending full certification details
Choose Enphase IQ Battery 5P If...
- ✓ You want to minimize energy losses during daily charge/discharge cycling
- ✓ A 15-year warranty gives you the confidence you need
- ✓ Enphase microinverter system owners who want a modular, highly efficient battery they can scale incrementally
Choose EG4 WallMount All Weather 314Ah If...
- ✓ You need more backup storage to cover overnight consumption or extended outages
- ✓ You need to power demanding appliances (AC, EV charger) simultaneously during outages
- ✓ Maximum battery longevity (10,000 cycles) is your top priority
- ✓ You want the flexibility to expand storage capacity over time (up to 16 units)
- ✓ Outdoor installations in harsh climates where IP67 protection and wireless monitoring are essential
Our Recommendation
The EG4 WallMount All Weather 314Ah is the decisive winner in this battery comparison, outperforming the Enphase IQ Battery 5P in 3 of 5 dimensions. Unless you have a specific requirement that the Enphase IQ Battery 5P uniquely addresses, the EG4 WallMount All Weather 314Ah is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Enphase IQ Battery 5P or EG4 WallMount All Weather 314Ah?
The EG4 WallMount All Weather 314Ah wins this battery comparison by a decisive margin. It delivers 16 kWh of usable storage with 10.24 kW continuous output and a 10,000-cycle rating. The 11.0 kWh capacity advantage provides 15 additional hours of essential-load backup.
Which battery lasts longer?
The Enphase IQ Battery 5P is rated for 8,000 cycles versus 10,000 for the EG4 WallMount All Weather 314Ah. EG4 WallMount All Weather 314Ah lasts approximately 5 more years of daily cycling. LFP chemistry generally outlasts NMC in cycle life testing.
Which battery provides more backup power?
The Enphase IQ Battery 5P provides 3.84 kW continuous (5.76 kW peak) versus 10.24 kW continuous (12.8 kW peak) for the EG4 WallMount All Weather 314Ah. EG4 WallMount All Weather 314Ah can run more appliances simultaneously during an outage. A central AC typically needs 3-5 kW, a refrigerator 0.2 kW, and an EV charger 7-11 kW.
Can I expand Enphase IQ Battery 5P or EG4 WallMount All Weather 314Ah storage later?
Enphase IQ Battery 5P: Yes, up to 8 units for 40 kWh total. EG4 WallMount All Weather 314Ah: Yes, up to 16 units for 256 kWh total. EG4 WallMount All Weather 314Ah offers more expansion potential.
Which battery chemistry is safer?
Both use LFP (Lithium Iron Phosphate) chemistry, which is the safest lithium battery chemistry for residential use. LFP does not undergo thermal runaway, uses no cobalt, and is inherently stable.
Related Resources
Last updated: February 2026