HomeGrid Stack'd Series 38.4kWh vs Fortress Power LFP-10
The HomeGrid Stack'd Series 38.4kWh wins this battery comparison by a decisive margin. It delivers 38.4 kWh of usable storage with 34.4 kW continuous output and a 6,000-cycle rating. The 28.2 kWh capacity advantage provides 38 additional hours of essential-load backup.
Key Differences
- • HomeGrid Stack'd Series 38.4kWh provides 38.4 kWh vs 10.24 kWh usable capacity.
- • Fortress Power LFP-10 achieves 98% round-trip efficiency vs 96%.
Specifications Breakdown
Usable Storage Capacity
The HomeGrid Stack'd Series 38.4kWh provides 38.4 kWh of usable capacity (38.4 kWh total, 100% DoD), while the Fortress Power LFP-10 offers 10.24 kWh usable (10.24 kWh total, 100% DoD). At an average essential-load consumption rate of 750 watts, the HomeGrid Stack'd Series 38.4kWh provides approximately 51.2 hours of backup versus 13.7 hours for the Fortress Power LFP-10. The HomeGrid Stack'd Series 38.4kWh's 28.2 kWh capacity advantage translates to roughly 38 additional hours of essential-load backup during a grid outage. The HomeGrid Stack'd Series 38.4kWh is scalable up to 15 units (576 kWh total), while the Fortress Power LFP-10 scales up to 8 units (82 kWh total).
Power Output
The HomeGrid Stack'd Series 38.4kWh delivers 34.4 kW continuous and 50 kW peak power, while the Fortress Power LFP-10 provides 5.12 kW continuous and 5.12 kW peak. The HomeGrid Stack'd Series 38.4kWh'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 38.4kWh's 50 kW peak is capable of starting most residential HVAC systems.
Battery Chemistry & Cycle Life
The HomeGrid Stack'd Series 38.4kWh uses LFP chemistry with a rated cycle life of 6,000 cycles (approximately 16.4 years of daily cycling), while the Fortress Power LFP-10 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. Identical cycle ratings mean both batteries have the same expected operational lifespan under daily cycling.
Round-Trip Efficiency
The HomeGrid Stack'd Series 38.4kWh achieves 96% round-trip efficiency versus 98% for the Fortress Power LFP-10. This means for every 10 kWh of solar energy stored in the Fortress Power LFP-10, 9.8 kWh is recoverable, compared to 9.6 kWh for the other. Over 10 years of daily cycling with 15 kWh average daily throughput, the more efficient battery saves approximately $164 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 HomeGrid Stack'd Series 38.4kWh carries a 10-year warranty, while the Fortress Power LFP-10 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 | HomeGrid Stack'd Series 38.4kWh | Fortress Power LFP-10 |
|---|---|---|
| Capacity | 38.4 kWh | 10.24 kWh |
| Usable Capacity | 38.4 kWh | 10.24 kWh |
| Power Output | 34.4 kW | 5.12 kW |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Efficiency | 96% | 98% |
| Cycle Life | 6,000 | 6,000 |
| Weight | 268 kg | 52 kg |
| Warranty | 10 years | 10 years |
| Scalable | Yes | Yes |
5-Dimension Head-to-Head Analysis
1. Storage Capacity
Winner: HomeGrid Stack'd Series 38.4kWhThe HomeGrid Stack'd Series 38.4kWh provides 38.4 kWh versus 10.24 kWh — 28.2 kWh more usable storage. At typical essential-load consumption of 0.75 kW, this equals approximately 38 additional hours of backup power. This is a substantial capacity gap.
2. Power Output
Winner: HomeGrid Stack'd Series 38.4kWhThe HomeGrid Stack'd Series 38.4kWh delivers 34.4 kW continuous versus 5.12 kW. This is enough to run a central AC unit, refrigerator, and general household loads simultaneously. The 29.3 kW power gap significantly impacts what appliances you can run during outages.
3. Chemistry & Longevity
Winner: TieBoth use LFP chemistry with identical 6,000-cycle ratings. LFP chemistry provides excellent thermal stability, long cycle life, and no cobalt dependency.
4. Round-Trip Efficiency
Winner: Fortress Power LFP-10The Fortress Power LFP-10 achieves 98% round-trip efficiency versus 96%. Over 10 years of daily cycling with 15 kWh throughput per day, the more efficient battery saves approximately 164 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.
HomeGrid Stack'd Series 38.4kWh
The HomeGrid Stack'd Series 38.4kWh is the maximum single-stack configuration with 8 modules. Delivering 34.4 kW continuous and 50 kW peak power with 38.4 kWh capacity, it provides multi-day backup capability for energy-intensive homes pursuing full off-grid or near-off-grid living.
Pros
- + 38.4 kWh provides multi-day backup for most homes
- + 34.4 kW continuous output surpasses most residential needs
- + Still expandable — up to 15 stacks in parallel for 576 kWh
- + Highest energy density per stack in the 48V residential category
Cons
- - 268kg requires reinforced concrete pad or heavy-duty rack
- - Maximum stack height may require ceiling clearance planning
- - Very high current draw at peak — requires heavy gauge wiring
Fortress Power LFP-10
The Fortress Power LFP-10 is a 10.24 kWh 48V lithium iron phosphate battery with an integrated 150A DC breaker for safe service. It offers 98% round-trip efficiency and 100% depth of discharge. Compact and relatively lightweight at 52kg, it's designed for indoor rack-mount or shelf installation and is compatible with most 48V hybrid inverters.
Pros
- + 98% round-trip efficiency — among the highest in its class
- + Integrated 150A DC breaker enhances safety during service
- + 10.24 kWh in a compact, 52kg package
- + Compatible with Sol-Ark, Victron, Growatt, and many other inverters
Cons
- - 5.12 kW continuous output limits high-load backup scenarios
- - Indoor-only installation
- - Less modular than competitors — fixed 10.24 kWh per unit
Choose HomeGrid Stack'd Series 38.4kWh 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 the flexibility to expand storage capacity over time (up to 15 units)
- ✓ Off-grid homes, preppers, and energy-intensive households seeking maximum battery autonomy
Choose Fortress Power LFP-10 If...
- ✓ You want to minimize energy losses during daily charge/discharge cycling
- ✓ DIY and professional installers seeking high-efficiency 48V storage at a competitive price point
Our Recommendation
The HomeGrid Stack'd Series 38.4kWh is the decisive winner in this battery comparison, outperforming the Fortress Power LFP-10 in 2 of 5 dimensions. Unless you have a specific requirement that the Fortress Power LFP-10 uniquely addresses, the HomeGrid Stack'd Series 38.4kWh is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, HomeGrid Stack'd Series 38.4kWh or Fortress Power LFP-10?
The HomeGrid Stack'd Series 38.4kWh wins this battery comparison by a decisive margin. It delivers 38.4 kWh of usable storage with 34.4 kW continuous output and a 6,000-cycle rating. The 28.2 kWh capacity advantage provides 38 additional hours of essential-load backup.
Which battery lasts longer?
The HomeGrid Stack'd Series 38.4kWh is rated for 6,000 cycles versus 6,000 for the Fortress Power LFP-10. Both have identical expected cycle life. LFP chemistry generally outlasts NMC in cycle life testing.
Which battery provides more backup power?
The HomeGrid Stack'd Series 38.4kWh provides 34.4 kW continuous (50 kW peak) versus 5.12 kW continuous (5.12 kW peak) for the Fortress Power LFP-10. HomeGrid Stack'd Series 38.4kWh 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 HomeGrid Stack'd Series 38.4kWh or Fortress Power LFP-10 storage later?
HomeGrid Stack'd Series 38.4kWh: Yes, up to 15 units for 576 kWh total. Fortress Power LFP-10: Yes, up to 8 units for 82 kWh total. HomeGrid Stack'd Series 38.4kWh 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