Marcus R.
2025-10-15
Exceeded expectations
The StackMax Reserve 220 has been running flawlessly. Sizing was spot-on and install was clean.
Verified purchase
Why we recommend this
Our Energy Score for this model is 72/100 (Very Good). We weighed round-trip efficiency, warranty depth, compatibility, and real-world use cases for home batteries.
- LiFePO4 chemistry with long cycle life
- Integrated BMS with thermal protection
- Expandable with additional modules
Purchases through our links support independent testing at no extra cost to you.
Overview
StackMax Reserve 220 delivers 15 kWh of reliable energy storage with LFP Rack cells, intelligent BMS protection, and seamless integration into modern solar ecosystems. Engineered by StackMax for homeowners who demand performance, transparency, and long-term value.
- Whole-home backup
- Off-grid cabin
- Peak shaving & demand charges
Compatibility
HomeCabinCommercial
Pros & cons
Pros
- LiFePO4 chemistry with long cycle life
- Integrated BMS with thermal protection
- Expandable with additional modules
Cons
- Requires compatible inverter for full backup
- Professional install recommended
Technical specifications
- Capacity
- 15 kWh
- Voltage
- 51.2 V
- Chemistry
- LFP Rack
- Warranty
- 10 years
- Cycle Life
- 7000 cycles @ 80% DoD
- Operating Temp
- -4°F to 122°F (-20°C to 50°C)
- Backup Power
- 14 kW continuous
- Mounting
- Wall
- IP Rating
- IP65
Compare similar models
Customer reviews
Priya N.
2025-09-15
Solid performance
The StackMax Reserve 220 has been running flawlessly. Monitoring is intuitive and savings are real.
Verified purchase
Tom V.
2025-08-15
Great value
The StackMax Reserve 220 has been running flawlessly. Monitoring is intuitive and savings are real.
Verified purchase
Dana W.
2025-07-15
Great value
The StackMax Reserve 220 has been running flawlessly. Monitoring is intuitive and savings are real.
Verified purchase
Elena K.
2025-06-15
Great value
The StackMax Reserve 220 has been running flawlessly. Monitoring is intuitive and savings are real.
Verified purchase
FAQ
Most residential battery and solar equipment qualifies for the 30% federal ITC when paired with solar. Consult your tax advisor for your specific situation.
Affiliate disclosure: We may earn a commission if you buy through our links. Price and availability are set by the retailer and may change. Always confirm the current price before checkout.
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Price shown is for comparison only. See the live price at checkout.
4.5
- Capacity
- 15 kWh
- Voltage
- 51.2 V
- Cycles
- 4,000
- Weight
- 76 lbs
Affiliate disclosure: We may earn a commission if you buy through our links. Price and availability are set by the retailer and may change. Always confirm the current price before checkout.