Savant Power Storage 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 18.8 kWh capacity advantage provides 25 additional hours of essential-load backup.
Key Differences
- • HomeGrid Stack'd Series 28.8kWh provides 28.8 kWh vs 10 kWh usable capacity.
- • HomeGrid Stack'd Series 28.8kWh achieves 96% round-trip efficiency vs 90%.
Specifications Breakdown
Usable Storage Capacity
The Savant Power Storage provides 10 kWh of usable capacity (10 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 Savant Power Storage provides approximately 13.3 hours of backup versus 38.4 hours for the HomeGrid Stack'd Series 28.8kWh. The HomeGrid Stack'd Series 28.8kWh's 18.8 kWh capacity advantage translates to roughly 25 additional hours of essential-load backup during a grid outage. The Savant Power Storage is scalable up to 20 units (200 kWh total), while the HomeGrid Stack'd Series 28.8kWh scales up to 15 units (432 kWh total).
Power Output
The Savant Power Storage delivers 5 kW continuous and 7 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 Savant Power Storage uses LFP chemistry with a rated cycle life of 6,000 cycles (approximately 16.4 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. Identical cycle ratings mean both batteries have the same expected operational lifespan under daily cycling.
Round-Trip Efficiency
The Savant Power Storage achieves 90% 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 9.0 kWh for the other. Over 10 years of daily cycling with 15 kWh average daily throughput, the more efficient battery saves approximately $493 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 Savant Power Storage carries a 10-year warranty, 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 | Savant Power Storage | HomeGrid Stack'd Series 28.8kWh |
|---|---|---|
| Capacity | 10 kWh | 28.8 kWh |
| Usable Capacity | 10 kWh | 28.8 kWh |
| Power Output | 5 kW | 25.8 kW |
| Chemistry | LFP (Lithium Iron Phosphate) | LFP (Lithium Iron Phosphate) |
| Efficiency | 90% | 96% |
| Cycle Life | 6,000 | 6,000 |
| Weight | 115 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 10 kWh — 18.8 kWh more usable storage. At typical essential-load consumption of 0.75 kW, this equals approximately 25 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 5 kW. This is enough to run a central AC unit, refrigerator, and general household loads simultaneously. The 20.8 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: HomeGrid Stack'd Series 28.8kWhThe HomeGrid Stack'd Series 28.8kWh achieves 96% round-trip efficiency versus 90%. Over 10 years of daily cycling with 15 kWh throughput per day, the more efficient battery saves approximately 493 dollars in energy that would otherwise be lost as heat (at $0.15/kWh). This efficiency gap is significant and meaningfully impacts lifetime economics.
5. Warranty Coverage
Winner: TieBoth carry 10-year warranties — equal long-term manufacturer protection.
Savant Power Storage
The Savant Power Storage is a 10 kWh LFP battery module designed to integrate with Savant's intelligent power management ecosystem, which includes the Savant Power Module smart circuit panel for per-circuit monitoring and control. Each storage unit pairs with Savant's energy management software to provide granular control over which circuits receive backup power and when. The system supports up to 20 battery modules for 200 kWh of total storage, making it suitable for the largest luxury residential installations. Savant's heritage in premium home automation means the storage system integrates natively with lighting, climate, and entertainment control.
Pros
- + Deep integration with Savant smart home and power management ecosystem
- + Per-circuit monitoring and control via Savant Power Module panel
- + Scales to 200 kWh with 20 units for ultra-large residential installations
- + LFP chemistry with 100% depth of discharge and 6,000-cycle life
Cons
- - Requires Savant Power Module ecosystem for full functionality
- - Premium luxury market pricing significantly above mass-market alternatives
- - Smaller installer network compared to mainstream battery brands
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 Savant Power Storage If...
- ✓ You want the flexibility to expand storage capacity over time (up to 20 units)
- ✓ Luxury smart home owners with Savant automation systems who want deeply integrated energy storage with per-circuit intelligence
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 Savant Power Storage in 3 of 5 dimensions. Unless you have a specific requirement that the Savant Power Storage uniquely addresses, the HomeGrid Stack'd Series 28.8kWh is the stronger choice for virtually every installation scenario.
Frequently Asked Questions
Which is better, Savant Power Storage 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 18.8 kWh capacity advantage provides 25 additional hours of essential-load backup.
Which battery lasts longer?
The Savant Power Storage is rated for 6,000 cycles versus 6,000 for the HomeGrid Stack'd Series 28.8kWh. Both have identical expected cycle life. LFP chemistry generally outlasts NMC in cycle life testing.
Which battery provides more backup power?
The Savant Power Storage provides 5 kW continuous (7 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 Savant Power Storage or HomeGrid Stack'd Series 28.8kWh storage later?
Savant Power Storage: Yes, up to 20 units for 200 kWh total. HomeGrid Stack'd Series 28.8kWh: Yes, up to 15 units for 432 kWh total. Savant Power Storage 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