Enphase IQ Battery 5P vs LG Energy Solution RESU Prime 16H
The LG Energy Solution RESU Prime 16H wins this battery comparison by a decisive margin. It delivers 15.2 kWh of usable storage with 7 kW continuous output and a 6,000-cycle rating. The 10.2 kWh capacity advantage provides 14 additional hours of essential-load backup.
Key Differences
- • LG Energy Solution RESU Prime 16H provides 15.2 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.
- • Enphase IQ Battery 5P is rated for 8,000 cycles vs 6,000.
Specifications Breakdown
Usable Storage Capacity
The Enphase IQ Battery 5P provides 5 kWh of usable capacity (5 kWh total, 100% DoD), while the LG Energy Solution RESU Prime 16H offers 15.2 kWh usable (16 kWh total, 95% DoD). At an average essential-load consumption rate of 750 watts, the Enphase IQ Battery 5P provides approximately 6.7 hours of backup versus 20.3 hours for the LG Energy Solution RESU Prime 16H. The LG Energy Solution RESU Prime 16H's 10.2 kWh capacity advantage translates to roughly 14 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 LG Energy Solution RESU Prime 16H scales up to 2 units (30 kWh total).
Power Output
The Enphase IQ Battery 5P delivers 3.84 kW continuous and 5.76 kW peak power, while the LG Energy Solution RESU Prime 16H provides 7 kW continuous and 9 kW peak. The LG Energy Solution RESU Prime 16H'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 LG Energy Solution RESU Prime 16H's 9 kW peak is suitable for lighter startup loads.
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 LG Energy Solution RESU Prime 16H uses LFP with 6,000 cycles (approximately 16.4 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 Enphase IQ Battery 5P'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 LG Energy Solution RESU Prime 16H. 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 LG Energy Solution RESU Prime 16H offers 10 years and 22.4 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 | LG Energy Solution RESU Prime 16H |
|---|---|---|
| Capacity | 5 kWh | 16 kWh |
| Usable Capacity | 5 kWh | 15.2 kWh |
| Power Output | 3.84 kW | 7 kW |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Efficiency | 96% | 95% |
| Cycle Life | 8,000 | 6,000 |
| Weight | 68 kg | 120 kg |
| Warranty | 15 years | 10 years |
| Scalable | Yes | Yes |
5-Dimension Head-to-Head Analysis
1. Storage Capacity
Winner: LG Energy Solution RESU Prime 16HThe LG Energy Solution RESU Prime 16H provides 15.2 kWh versus 5 kWh — 10.2 kWh more usable storage. At typical essential-load consumption of 0.75 kW, this equals approximately 14 additional hours of backup power. This is a substantial capacity gap.
2. Power Output
Winner: LG Energy Solution RESU Prime 16HThe LG Energy Solution RESU Prime 16H delivers 7 kW continuous versus 3.84 kW. Sufficient for most essential backup loads including a small AC unit. The 3.2 kW power gap significantly impacts what appliances you can run during outages.
3. Chemistry & Longevity
Winner: Enphase IQ Battery 5PBoth use LFP chemistry with Enphase IQ Battery 5P at 8,000 cycles vs LG Energy Solution RESU Prime 16H at 6,000 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
LG Energy Solution RESU Prime 16H
The LG RESU Prime 16H is a high-voltage residential battery that pairs LFP chemistry with 16 kWh of total capacity for dependable long-duration energy storage. Operating at 400V nominal, it achieves 95% round-trip efficiency and works with a wide range of compatible hybrid inverters from SMA, SolarEdge, and others. The compact design delivers excellent energy density, fitting comfortably in a garage or utility room. LG backs it with a 10-year warranty and 22.4 MWh throughput guarantee, reflecting confidence in the LFP cell longevity.
Pros
- + High-voltage architecture pairs efficiently with leading hybrid inverters
- + 16 kWh capacity covers most household overnight energy needs
- + 95% round-trip efficiency among the best for high-voltage batteries
- + LFP chemistry with robust 22.4 MWh throughput warranty
Cons
- - Limited to 2-unit stacking for 32 kWh maximum
- - Narrower operating temperature range than some competitors at -10 to 45 degrees C
Choose Enphase IQ Battery 5P If...
- ✓ Maximum battery longevity (8,000 cycles) is your top priority
- ✓ You want to minimize energy losses during daily charge/discharge cycling
- ✓ A 15-year warranty gives you the confidence you need
- ✓ You want the flexibility to expand storage capacity over time (up to 8 units)
- ✓ Enphase microinverter system owners who want a modular, highly efficient battery they can scale incrementally
Choose LG Energy Solution RESU Prime 16H 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
- ✓ Homeowners with compatible hybrid inverters who want a high-capacity, high-efficiency DC-coupled LFP battery
Our Recommendation
The LG Energy Solution RESU Prime 16H is the decisive winner in this battery comparison, outperforming the Enphase IQ Battery 5P in 2 of 5 dimensions. Unless you have a specific requirement that the Enphase IQ Battery 5P uniquely addresses, the LG Energy Solution RESU Prime 16H is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Enphase IQ Battery 5P or LG Energy Solution RESU Prime 16H?
The LG Energy Solution RESU Prime 16H wins this battery comparison by a decisive margin. It delivers 15.2 kWh of usable storage with 7 kW continuous output and a 6,000-cycle rating. The 10.2 kWh capacity advantage provides 14 additional hours of essential-load backup.
Which battery lasts longer?
The Enphase IQ Battery 5P is rated for 8,000 cycles versus 6,000 for the LG Energy Solution RESU Prime 16H. Enphase IQ Battery 5P 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 7 kW continuous (9 kW peak) for the LG Energy Solution RESU Prime 16H. LG Energy Solution RESU Prime 16H 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 LG Energy Solution RESU Prime 16H storage later?
Enphase IQ Battery 5P: Yes, up to 8 units for 40 kWh total. LG Energy Solution RESU Prime 16H: Yes, up to 2 units for 30 kWh total. Enphase IQ Battery 5P 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.
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Last updated: February 2026