HomeGrid’s Stack’d Series is a modular 48V LFP home battery that scales from 9.6kWh to 38.4kWh in a single stack and up to 576kWh with 15 stacks in parallel, with up to 14.4kW of continuous power from four modules or more, according to HomeGrid’s January 2026 specification sheet. It’s built from 4.8kWh modules that stack on a base with a battery management unit, and HomeGrid lists UL 9540 and UL 9540A certification along with a 10-year warranty. This review walks through the specs, how sizing works and which homes it fits best.
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All figures come from HomeGrid’s Stack’d Series specification sheet (21240.4P, Jan 2026) and HomeGrid’s installation documentation. I haven’t installed a Stack’d system, so runtime numbers are labeled estimates. This is typically an installer-sold product; get a quote for your exact configuration.
What is the HomeGrid Stack’d Series?
Stack’d is a low-voltage (48V nominal) lithium iron phosphate battery system for homes, off-grid cabins and solar-plus-storage installs. Each stack sits on a base with a BMS, holds two to eight 4.8kWh modules, and connects to a compatible hybrid or off-grid inverter over CAN or RS485. You can add modules later, and HomeGrid says the warranty is per component to support upgrades.
Stack’d Series specs by size
| Modules | Energy | Continuous power | Surge (10 s) | Max charge/discharge | Height | Weight |
|---|---|---|---|---|---|---|
| 2 | 9.6kWh | 8.6kW | 14.4kW | 180A | 25.25 in | 304 lb |
| 3 | 14.4kWh | 12.9kW | 14.4kW | 270A | 30.5 in | 412 lb |
| 4 | 19.2kWh | 14.4kW | 24kW | 300A | 35.75 in | 520 lb |
| 5 | 24kWh | 14.4kW | 24kW | 300A | 41 in | 628 lb |
| 6 | 28.8kWh | 14.4kW | 24kW | 300A | 46.25 in | 736 lb |
| 7 | 33.6kWh | 14.4kW | 24kW | 300A | 51.5 in | 844 lb |
| 8 | 38.4kWh | 14.4kW | 24kW | 300A | 56.75 in | 952 lb |
System-wide specs
| Spec | Stack’d Series |
|---|---|
| Chemistry | Lithium iron phosphate (LFP), cobalt-free |
| Nominal voltage / range | 48V / 46–56V |
| Pulse current (10 s) | 300A (2–3 modules); 500A (4+ modules) |
| Round-trip efficiency | >98% (HomeGrid) |
| Footprint | 29 in wide × 15.8 in deep, floor standing |
| Enclosure | IP55; all-weather modules, heated module option |
| Charging temperature | 32–113°F |
| Discharging temperature | 14–131°F |
| Max altitude | 11,000 ft |
| Scalability | 15 stacks in parallel, 576kWh |
| Communication | CAN / RS485; app monitoring |
| Certifications | UL 1642, UL 1973, UN 38.3, UL 9540, UL 9540A, CEC, SGIP, OGPe |
| Warranty | 10 years |
Compatible inverters
HomeGrid’s sheet lists Sol-Ark 12K and 15K for on-grid UL 9540 systems, and Sol-Ark, Schneider, SMA, Victron, OutBack and others for off-grid use. If you run Victron gear, my guide to third-party lithium batteries that talk to Victron explains how closed-loop communication works.
What stands out
- High power from one stack. 14.4kW continuous and 24kW surge from four modules up is enough for many whole-home backup loads, including central AC with a properly sized inverter.
- Add capacity in 4.8kWh steps. Start with two modules and grow to eight without replacing the base.
- Massive scaling. Up to 576kWh across 15 stacks suits large homes, farms and small commercial sites.
- Outdoor-capable. IP55 all-weather modules and an optional heated module broaden where it can go.
- Safety certifications. UL 9540 and UL 9540A listings help with permitting.
Things to plan for
- Weight. A full eight-module stack is 952 lb, so floor strength and delivery logistics matter.
- Inverter match. Confirm your inverter is on HomeGrid’s compatibility list and set up for closed-loop communication.
- Power ramps with modules. Two modules give 8.6kW; full 14.4kW starts at four.
- Cold charging. Like all LFP, it won’t charge below 32°F unless you use the heated module option.
Sizing worked example (estimate)
Say your home averages 30kWh a day and you want to cover essentials during an outage: fridge, freezer, furnace blower, well pump, lights, internet and some cooking, totaling about 12kWh a day. A four-module stack (19.2kWh) would cover about 1.4 days of essentials on battery alone (19.2 × 0.9 usable ÷ 12 ≈ 1.4), and much longer with solar. A six-module stack (28.8kWh) covers about 2.2 days of essentials or most of a full day of normal use.
| Average load | 4 modules (19.2kWh) | 6 modules (28.8kWh) | 8 modules (38.4kWh) |
|---|---|---|---|
| Essentials, 500W | ~35 hr | ~52 hr | ~69 hr |
| Typical home, 1.25kW | ~14 hr | ~21 hr | ~28 hr |
| Heavy use, 3kW | ~5.8 hr | ~8.6 hr | ~11.5 hr |
*Estimates: kWh × 0.9 ÷ load; inverter losses and battery reserve settings vary.
How it compares
| System | Step size | Max per system | Continuous power |
|---|---|---|---|
| HomeGrid Stack’d | 4.8kWh | 38.4kWh per stack | Up to 14.4kW per stack |
| Anker SOLIX X1 | 5kWh | 30kWh per system | 6.6kW backup per system |
| SolarEdge Home Battery | 9.7kWh units | See SolarEdge | See SolarEdge |
For more on the alternatives, see my Anker SOLIX X1 review and SolarEdge Home Battery review.
Installation overview
Stack’d is floor-standing and assembled in place: the base with its BMS goes down first, then modules stack on top. Each module adds about 5.25 inches of height, which is why a two-module stack stands 25.25 inches and a full eight-module stack reaches 56.75 inches. The 29 × 15.8 inch footprint stays the same no matter how tall it gets, so wall space, not floor space, is usually the deciding factor in a garage or utility room.
- Location: a level floor that can carry up to 952 lb, with clearance for cable entry and service.
- Cabling: at 48V, 300A of continuous current calls for heavy DC cable and proper overcurrent protection sized by your installer.
- Communication: connect CAN or RS485 to the inverter so it can follow the BMS’s charge limits in closed loop.
- Commissioning: set the inverter’s battery type to the HomeGrid profile and confirm state of charge reads correctly in the monitoring app.
Because the low-voltage 48V design is common in off-grid and hybrid systems, many installers already stock compatible inverters, fuses and busbars. If you’re planning cable runs yourself, my fuse sizing guide explains the basics before you talk to an electrician.
Who it’s for
Stack’d suits homeowners and installers who want high power and room to grow on a 48V system, especially with Sol-Ark hybrid inverters or off-grid setups using Victron, Schneider, SMA or OutBack. It’s a strong fit for rural properties with well pumps, large homes and anyone planning to add capacity over time.
Worked example: sizing an off-grid cabin (estimate)
Say an off-grid cabin uses about 8kWh a day: a fridge and freezer, a well pump, lights, internet, a laptop and some evening cooking. You want three days of battery backup for cloudy stretches.
- Energy needed: 8kWh × 3 days = 24kWh usable. At a 0.9 usable factor, that’s about 26.7kWh of rated capacity.
- Stack size: six modules (28.8kWh) meet that with a small margin, in one stack.
- Power: six modules support the full 14.4kW continuous and 24kW surge, plenty for a well pump starting while other loads run, as long as the inverter is sized to match.
- Solar to refill a day’s use: 8kWh ÷ (5 sun hours × ~0.8 system efficiency) ≈ 2kW of panels. A 3–4kW array refills faster after cloudy days.
| Daily use | Days of backup wanted | Rated capacity needed (est.) | Stack’d modules |
|---|---|---|---|
| 5kWh | 2 | ~11.1kWh | 3 (14.4kWh) |
| 8kWh | 3 | ~26.7kWh | 6 (28.8kWh) |
| 12kWh | 2 | ~26.7kWh | 6 (28.8kWh) |
| 15kWh | 2 | ~33.3kWh | 7 (33.6kWh) |
Growing the system over time
One practical way to use Stack’d’s 4.8kWh steps is to start with the power level you need and add energy later. Four modules is a natural starting point if you want the full 14.4kW continuous rating, because power stops rising after four modules. From there, each added module mainly adds runtime. Plan the location for the final height from day one. An eight-module stack stands 56.75 inches tall, so leave room above the first install and keep cable entry and service clearances in mind. Ask your installer to note the planned final size in the design so the overcurrent protection and cabling already fit the bigger system.
FAQ
How many modules can a Stack’d hold?
Two to eight 4.8kWh modules per stack, from 9.6kWh to 38.4kWh.
How much power does it deliver?
Up to 14.4kW continuous and 24kW surge for 10 seconds with four or more modules.
Can it be installed outdoors?
HomeGrid lists an IP55 enclosure and all-weather modules, with a heated module option for cold climates.
What’s the warranty?
10 years, per component.
Is it UL 9540 certified?
Yes. HomeGrid lists UL 9540 and UL 9540A, plus UL 1973 and UL 1642.
Can I add modules later?
Yes. A stack grows from two to eight 4.8kWh modules on the same base. HomeGrid’s per-component warranty is designed to support upgrades.
Does it need solar?
No. It stores energy from whatever the inverter charges it with, including the grid or a generator if your inverter supports those sources. Solar is the most common pairing.
How tall is a full stack?
An eight-module stack is 56.75 inches tall on the same 29 × 15.8 inch footprint, per HomeGrid’s sheet.
Bottom line
The HomeGrid Stack’d Series combines 4.8kWh building blocks with serious power: up to 14.4kW continuous and 24kW surge per stack, 38.4kWh per stack and 576kWh at full scale. With strong safety listings and broad inverter support, it’s an excellent choice for whole-home backup and off-grid systems that need room to grow.