EG4 WallMount All Weather 314Ah vs HomeGrid Stack'd Series 28.8kWh
The HomeGrid Stack'd Series 28.8kWh wins this battery comparison by a decisive margin. It delivers 28.8 kWh of usable storage with 25.8 kW continuous output and a 6,000-cycle rating. The 12.8 kWh capacity advantage provides 17 additional hours of essential-load backup.
Key Differences
- • HomeGrid Stack'd Series 28.8kWh provides 28.8 kWh vs 16 kWh usable capacity.
- • HomeGrid Stack'd Series 28.8kWh achieves 96% round-trip efficiency vs 95%.
- • EG4 WallMount All Weather 314Ah is rated for 10,000 cycles vs 6,000.
Specifications Breakdown
Usable Storage Capacity
The EG4 WallMount All Weather 314Ah provides 16 kWh of usable capacity (16 kWh total, 100% DoD), while the HomeGrid Stack'd Series 28.8kWh offers 28.8 kWh usable (28.8 kWh total, 100% DoD). At an average essential-load consumption rate of 750 watts, the EG4 WallMount All Weather 314Ah provides approximately 21.3 hours of backup versus 38.4 hours for the HomeGrid Stack'd Series 28.8kWh. The HomeGrid Stack'd Series 28.8kWh's 12.8 kWh capacity advantage translates to roughly 17 additional hours of essential-load backup during a grid outage. The EG4 WallMount All Weather 314Ah is scalable up to 16 units (256 kWh total), while the HomeGrid Stack'd Series 28.8kWh scales up to 15 units (432 kWh total).
Power Output
The EG4 WallMount All Weather 314Ah delivers 10.24 kW continuous and 12.8 kW peak power, while the HomeGrid Stack'd Series 28.8kWh provides 25.8 kW continuous and 40 kW peak. The HomeGrid Stack'd Series 28.8kWh'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 HomeGrid Stack'd Series 28.8kWh's 40 kW peak is capable of starting most residential HVAC systems.
Battery Chemistry & Cycle Life
The EG4 WallMount All Weather 314Ah uses LFP chemistry with a rated cycle life of 10,000 cycles (approximately 27.4 years of daily cycling), while the HomeGrid Stack'd Series 28.8kWh 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 EG4 WallMount All Weather 314Ah's additional 4,000 cycles translates to approximately 11.0 more years of daily use before reaching the rated end of life.
Round-Trip Efficiency
The EG4 WallMount All Weather 314Ah achieves 95% round-trip efficiency versus 96% for the HomeGrid Stack'd Series 28.8kWh. This means for every 10 kWh of solar energy stored in the HomeGrid Stack'd Series 28.8kWh, 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 EG4 WallMount All Weather 314Ah carries a 10-year warranty and 122.2 MWh throughput, while the HomeGrid Stack'd Series 28.8kWh offers 10 years. Both offer identical warranty duration. 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 | EG4 WallMount All Weather 314Ah | HomeGrid Stack'd Series 28.8kWh |
|---|---|---|
| Capacity | 16 kWh | 28.8 kWh |
| Usable Capacity | 16 kWh | 28.8 kWh |
| Power Output | 10.24 kW | 25.8 kW |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Efficiency | 95% | 96% |
| Cycle Life | 10,000 | 6,000 |
| Weight | 140 kg | 206 kg |
| Warranty | 10 years | 10 years |
| Scalable | Yes | Yes |
5-Dimension Head-to-Head Analysis
1. Storage Capacity
Winner: HomeGrid Stack'd Series 28.8kWhThe HomeGrid Stack'd Series 28.8kWh provides 28.8 kWh versus 16 kWh — 12.8 kWh more usable storage. At typical essential-load consumption of 0.75 kW, this equals approximately 17 additional hours of backup power. This is a substantial capacity gap.
2. Power Output
Winner: HomeGrid Stack'd Series 28.8kWhThe HomeGrid Stack'd Series 28.8kWh delivers 25.8 kW continuous versus 10.24 kW. This is enough to run a central AC unit, refrigerator, and general household loads simultaneously. The 15.6 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 EG4 WallMount All Weather 314Ah at 10,000 cycles vs HomeGrid Stack'd Series 28.8kWh at 6,000 cycles. LFP chemistry provides excellent thermal stability, long cycle life, and no cobalt dependency.
4. Round-Trip Efficiency
Winner: HomeGrid Stack'd Series 28.8kWhThe HomeGrid Stack'd Series 28.8kWh 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: TieBoth carry 10-year warranties — equal long-term manufacturer protection.
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
HomeGrid Stack'd Series 28.8kWh
The HomeGrid Stack'd Series 28.8kWh uses 6 modules for a full day of storage for average US households. With 25.8 kW continuous power output, it handles whole-home backup including HVAC, EV charging, and high-draw appliances simultaneously.
Pros
- + 28.8 kWh covers a full day of average US household consumption
- + 25.8 kW continuous output handles any residential load scenario
- + Tool-free modular design — no inter-module wiring needed
- + UL 9540 and UL 9540A fire safety certified
Cons
- - 206kg requires dedicated floor space and structural support
- - High upfront cost for full 6-module configuration
- - 48V architecture means very high current at full power output
Choose EG4 WallMount All Weather 314Ah If...
- ✓ 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
Choose HomeGrid Stack'd Series 28.8kWh 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
- ✓ You want to minimize energy losses during daily charge/discharge cycling
- ✓ Whole-home backup and energy independence with high power demands
Our Recommendation
The HomeGrid Stack'd Series 28.8kWh is the decisive winner in this battery comparison, outperforming the EG4 WallMount All Weather 314Ah in 3 of 5 dimensions. Unless you have a specific requirement that the EG4 WallMount All Weather 314Ah uniquely addresses, the HomeGrid Stack'd Series 28.8kWh is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, EG4 WallMount All Weather 314Ah or HomeGrid Stack'd Series 28.8kWh?
The HomeGrid Stack'd Series 28.8kWh wins this battery comparison by a decisive margin. It delivers 28.8 kWh of usable storage with 25.8 kW continuous output and a 6,000-cycle rating. The 12.8 kWh capacity advantage provides 17 additional hours of essential-load backup.
Which battery lasts longer?
The EG4 WallMount All Weather 314Ah is rated for 10,000 cycles versus 6,000 for the HomeGrid Stack'd Series 28.8kWh. EG4 WallMount All Weather 314Ah lasts approximately 11 more years of daily cycling. LFP chemistry generally outlasts NMC in cycle life testing.
Which battery provides more backup power?
The EG4 WallMount All Weather 314Ah provides 10.24 kW continuous (12.8 kW peak) versus 25.8 kW continuous (40 kW peak) for the HomeGrid Stack'd Series 28.8kWh. HomeGrid Stack'd Series 28.8kWh 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 EG4 WallMount All Weather 314Ah or HomeGrid Stack'd Series 28.8kWh storage later?
EG4 WallMount All Weather 314Ah: Yes, up to 16 units for 256 kWh total. HomeGrid Stack'd Series 28.8kWh: Yes, up to 15 units for 432 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