Grid service
Responds to grid dispatch commands during CERP contracted dispatch windows.
DuoBox residential energy node
80 kWh reserve, installed at home.
DuoBox is the battery at the center of CERP: a modular LFP system with a 24 kW inverter, sized for homeowner backup and operated by DuoPower as dispatchable local grid capacity.
Human scale
Large enough to matter, still installable at home.
DuoBox is larger than a typical home battery, while keeping a compact form that fits beside homes and garages.
Dimensions
Compact footprint.
DuoBox stacks capacity vertically, keeping the ground footprint small for residential installation.
31.3 inWidth
16.7 inDepth
72.4 inHeight
3.6 sq ftGround footprint
Technical specifications
DuoBox-80/24 specifications.
| Parameter | Specification |
|---|---|
| Nameplate energy | 79.8 kWh |
| Usable system energy | 78.8 kWh |
| Inverter rated power | 24 kW continuous / 36 kW peak for 10 seconds |
| System dimensions | 31.3 in W x 16.7 in D x 72.4 in H |
| Enclosure | NEMA 4X / IP67 |
| Home-use allocation | 8.0 kWh is always allocated for household daily use. 78.8 kWh backup is available during grid outage events. |
| Grid-service allocation | 70.8 kWh allocated for CERP dispatch. |
| NQC base case | 17.7 kW (70.8 kWh over 4-hour dispatch window) |
| Backup transfer | Less than 10 ms |
| Round-trip efficiency | 90% |
| Max charge/discharge rate | 24 kW (0.3C) |
| Cycle life | 10,000 cycles |
| Calendar life | 20 years |
| Cell chemistry | Lithium Iron Phosphate (LFP) prismatic |
| Module energy | 15.95 kWh nominal |
| System modules | 5 stacked battery modules |
| System voltage | 256V DC nominal, 200-292V DC range |
| Operating temperature | -20°C to +55°C |
| Compliance | UL 9540, UL 9540A, UL 1741-SA, IEEE 1547, CA Rule 21, and California Energy Commission equipment listing |
Operating modes
Extended backup and grid services.
DuoPower manages grid-service operation under CERP rules, while your home receives backup reserve, bill savings, and CERP payments without buying the battery.
PSPS event watch
Suspends dispatch and pre-charges ahead of planned power outage events.
Emergency blackout
Whole home power backup during an emergency blackout from the available DuoBox state of charge under CERP terms.
Back to program
See what CERP could mean for your home.
Connect with a DuoPower energy expert to estimate potential bill savings, backup value, and CERP payments for your specific usage case.
