POWISER VOLIX 3 ULTRA 12K — 12kW Portable Backup, on Casters
Ships freight — what to expect
Pre-order. POWISER's next U.S. stock of the ULTRA 12K is due at the end of December 2026. Orders placed now are expected to ship in January 2027.
Description
The POWISER VOLIX 3 ULTRA 12K is a 12 kW split-phase backup power system on casters. It delivers 120/240 V from a built-in 10.24 kWh lithium iron phosphate battery, switches over in 10 ms like a UPS, and takes up to 10,000 W of solar through two MPPT inputs plus a separate 1,300 W low-voltage input.
It plugs in rather than mounting to a wall, so the whole-home output moves with you. It is a pre-order item, expected to ship in January 2027.
Shipping and Delivery
Availability: Pre-order. U.S. stock is due at the warehouse at the end of December 2026, and orders placed now are expected to ship in January 2027.
Delivery: Freight within the 48 contiguous states, a flat $750 shown at checkout. We do not ship to Alaska or Hawaii.
Freight details: Class 9 hazardous goods, so it travels by ground or LTL freight only, never air. Delivery is curbside on a liftgate truck, and someone must be there to receive it. The carrier will not bring it into the garage, so confirm your delivery access before ordering.
At delivery: At 309 lb, getting it off the truck and over a threshold takes two people. Inspect the crate before you sign, and contact us within 48 hours with photos if anything arrives damaged.
Key Features
12 kW split-phase: 12,000 W / 12,000 VA at 120/240 V, with 18,000 VA peak, for 240 V tools and appliances as well as 120 V ones.
UPS switchover: A 10 ms transfer time, so computers, networking gear and diagnostic equipment ride through an outage.
10.24 kWh battery: Lithium iron phosphate, built in.
Outlets for real equipment: Three 20 A 120 V, one 30 A 120 V and one 30 A 120/240 V outlet, plus USB-A and USB-C, so RV service and 240 V tools plug in directly, with no adapter or subpanel.
Dual solar inputs: Two high-voltage MPPT channels up to 10,000 W, and a 1,300 W low-voltage input that takes 12 V or 24 V panels directly, so a camper, trailer or existing 12 V setup needs no second charge controller.
On casters: Plug-connected, with no wall mounting.
Parallel capable: Up to six units for 72 kW of output and about 60 kWh of storage.
Flexible charging: Solar only, grid priority, solar priority or hybrid, with scheduled charge and discharge and an energy-saving mode.
Product Specifications
| Rated output | 12,000 W / 12,000 VA |
| Peak power | 18,000 VA |
| Output voltage | Split-phase: 120 Vac (L1/N, L2/N), 240 Vac (L1/L2) |
| Output frequency | 50 / 60 Hz |
| Waveform | Pure sine wave |
| UPS transfer time | 10 ms typical |
| AC outlets | 3x 20 A 120 V, 1x 30 A 120 V, 1x 30 A 120/240 V |
| DC outputs | 2x USB-A 18 W QC3.0, 2x USB-C 100 W PD, overcurrent protected |
| Protection | Short-circuit, over-voltage, under-voltage, overload and reverse-feed |
| Battery | Lithium iron phosphate (LiFePO4), 10.24 kWh, 51.2 V, 200 Ah; not expandable |
| Battery voltage range | 40 to 58.6 Vdc |
| Grid or generator charging | 160 A |
| Hybrid charging | 200 A max |
| High-voltage PV | 2 MPPT channels, 10,000 W max, 32 A / 32 A, 500 Vdc max open-circuit |
| MPPT operating range | 90 to 485 Vdc |
| Low-voltage PV | 1,300 W max, 22 A / 22 A, 12 to 60 Vdc, 60 Vdc max open-circuit |
| MPPT efficiency | 99.9% |
| Inverter efficiency | Over 92% |
| Grid or generator input | 120 Vac (L1/N, L2/N), 240 Vac (L1/L2), 85 to 140 Vac, 50/60 Hz |
| Bypass overcurrent | 60 A / 60 A (L1, L2) |
| Parallel | Up to 6 units: 72 kW, about 60 kWh |
| Certifications | UL 9540, UL 9540A, UL 1741, UL 1973 and FCC in progress, expected by the end of December 2026; not yet listed |
| Protection rating | IP20, indoor use only |
| Temperature | Discharging 5 to 131°F (-15 to 55°C), derated above 113°F (45°C); charging 32 to 131°F (0 to 55°C) |
| Cooling | Forced air |
| Noise | Under 60 dB |
| Communication | CAN, parallel port, CT port, dry contact port, Wi-Fi monitoring through the POWISER app |
| Dimensions (L x W x H) | 19.6 x 29.8 x 35.2 in (498 x 758 x 894 mm) |
| Weight | 309 lb (140 kg) |
| Warranty | 10 years, home energy storage |
What's Included
In the box: The VOLIX 3 ULTRA 12K on its integrated casters, and the user manual.
Installation and Compatibility
Not yet listed: Until the UL certificates are issued, use it off-grid and for plugged-in loads, and check what your local authority requires before it feeds household circuits.
Home circuits: Feeding household circuits through a transfer switch is a job for a licensed electrician, and rules vary by area. It supports CT metering, a UPS-style backup panel or an external automatic transfer switch.
Indoors only: IP20 rated. Keep it out of carports, open garages and exposed walls.
Solar strings: Keep each high-voltage string's open-circuit voltage under 500 Vdc, with room to spare for cold weather, when it rises.
Space and floor: 19.6 x 29.8 x 35.2 in and 309 lb. Plan a flat route on the casters from the delivery point to where it will sit.
Overload behavior: Above 102% of rated load it alarms and shuts down after 5 minutes, above 110% after 10 seconds, and above 125% after 5 seconds.
App: Wi-Fi monitoring runs through the POWISER app. Ask us about app access before you rely on it.
Warranty
Term: 10 years on the home energy storage system, for units bought from an authorized dealer.
Claims: Keep your order confirmation. Contact us first with your order number and a description of the fault, and we take the claim to POWISER.
Returns: Within 30 days of delivery, unused and in the original packaging, under our return and refund policy.
Frequently Asked Questions
When will it ship?
It is a pre-order. U.S. stock is due at the end of December 2026, and orders placed now are expected to ship in January 2027.
Can it run 240 V equipment?
Yes. The output is split-phase 120/240 V, with a dedicated 30 A 120/240 V outlet alongside a 30 A 120 V and three 20 A 120 V outlets.
Is it UL listed?
Not yet. Certification to UL 9540, UL 9540A, UL 1741 and UL 1973, plus FCC, is expected by the end of December 2026. Until then, treat it as an off-grid and plugged-loads unit, and check local requirements before it feeds household circuits.
Does it need an electrician?
Not for plugged-in loads, since it rolls on casters and plugs in. Feeding household circuits through a transfer switch does need a licensed electrician.
How much solar can I connect?
Up to 10,000 W across two high-voltage MPPT channels at 32 A each, with a 500 Vdc open-circuit ceiling, plus 1,300 W on the separate 12 to 60 Vdc low-voltage input.
Can I add more later?
Up to six units run in parallel for 72 kW and about 60 kWh. A single unit's battery is not expandable.
Certifications
-
POWISER VOLIX 3 ULTRA 12K — UL and FCC certification pending Pending
- Issued by
- Pending. POWISER expects certification by the end of December 2026
- Model
- VOLIX 3 ULTRA 12K
- Standards
-
- UL 9540 — PENDING, not yet listed
- UL 9540A — PENDING, not yet listed
- UL 1741 — PENDING, not yet listed
- UL 1973 — PENDING, not yet listed
- FCC — PENDING
Each record is taken from the certificate itself or the issuing body’s register. A radio or EMC authorization is not a product-safety listing — every record states its own scope.
Shipping & returns
Returns follow the stated return window — see returns & exchanges. Freight returns are arranged by our team.
Lithium battery shipments travel by ground only, never air, and can carry destination restrictions. Feeding household circuits through a transfer switch needs a licensed electrician, who will tell you whether your area needs a permit and inspection.
Who it is for
For backup power that moves when you do
The ULTRA 12K is the caster-mounted version of POWISER's 12kW split-phase platform: real 120/240V output from a unit you roll into place rather than hardwire. Plug equipment into its five AC outlets from day one. Feeding household circuits through a panel or transfer switch waits on UL certification, which is still pending. If you want a permanent wall installation with storage in the enclosure, its sibling is the VOLIX 3 H12 PRO.
- CONTINUOUS SPLIT-PHASE OUTPUT
- 12kW
- PEAK SURGE HEADROOM
- 18,000VA
- GRID-TO-BATTERY TRANSFER
- 10 ms
- MAX SOLAR INPUT, BOTH INPUTS
- 11,300W
What sets the ULTRA 12K apart
-
Real 240V circuits
Split-phase output and a dedicated 30A 120/240V outlet run RV service or 240V tools without an adapter or subpanel
-
Rolls, does not install
Locking casters and a removable rolling base: plug-connected rather than hardwired, so it moves when you do
-
Solar at two voltages
Two high-voltage MPPT channels to 10,000W, plus a separate 1,300W input that takes 12V or 24V panels directly
-
Parallels to 72kW
Six units run in parallel for 72kW of output and about 60kWh of storage
Built to move, sized for the house
Split-phase output on casters, with UPS switching and two solar inputs
-
Switches before your electronics notice
Transfer to battery is 10 ms typical, fast enough that computers, networking gear and diagnostic equipment ride through an outage without rebooting. The unit takes grid, generator and solar input, and can be set to solar only, grid priority, solar priority or hybrid charging.
10 ms typical transfer time
-
Outlets that match real equipment
Three 20A 120V outlets, a 30A 120V outlet and a 30A 120V/240V outlet, all pure sine wave, plus two 100W USB-C and two 18W USB-A ports for bench electronics. A touchscreen shows what the unit is doing.
5 AC outlets, 12,000W continuous
-
Built to move between sites
Locking casters roll it from the garage to an RV, a cabin or a job site and hold it in place once it is set up. The rolling base is removable for transport. It is rated IP20, so every location has to be indoors.
Locking casters, removable rolling base
-
Scales up as your needs grow
Run up to six units in parallel for 72kW of output and about 60kWh of storage. Feeding household circuits waits on UL certification, expected by the end of December 2026.
Up to 6 units in parallel, 72kW
How it compares
The largest backup systems in the range, side by side
| Feature | ULTRA 12K | H12 PRO | Explorer 5000 Plus |
|---|---|---|---|
| Installation | Caster-mounted, plug-connected | Wall-mounted, hardwired | Portable, on wheels |
| Continuous output | 12,000W split-phase | 12,000W split-phase | 7,200W |
| Peak output | 18,000VA | 18,000VA | 14,400W |
| Transfer time | 10 ms typical | 10 ms typical | 0 ms online / 20 ms backup |
| Max solar input | 10,000W + 1,300W low-voltage | 10,000W | 4,000W high-PV |
| Parallel capability | Up to 6 units, 72kW | Up to 6 units, 72kW | Two stations, 14,400W |
| Battery voltage | 51.2Vdc | 51.2Vdc | Not stated |
| Weight | 309 lb (140 kg) | 309 lb (140 kg) | 134.5 lb (61 kg) |
Full specifications
Specifications for the VOLIX 3 ULTRA 12K
- Rated output power
- 12,000W / 12,000VA
- Maximum peak power
- 18,000VA
- Rated output voltage
- Split-phase: 120Vac (L1/N, L2/N) / 240Vac (L1/L2)
- Output frequency
- 50Hz / 60Hz
- Output waveform
- Pure sine wave
- UPS transfer time
- 10 ms (typical)
- AC outlets
- 3× 20A 120V, 1× 30A 120V, 1× 30A 120V/240V
- DC outputs
- 2× USB-A 18W QC3.0, 2× USB-C 100W PD, overcurrent protected
- Battery type
- Lithium iron phosphate (LiFePO₄)
- Battery capacity
- 10.24kWh (51.2V, 200Ah). Not expandable: external battery packs fit the H12 PRO only
- Rated battery voltage
- 51.2Vdc (range 40–58.6Vdc)
- Grid / generator charging current
- 160A
- Maximum hybrid charging current
- 200A
- High-voltage PV input
- 2 MPPT channels, 10,000W max (PV1 / PV2), 32A / 32A, 500Vdc max open-circuit
- MPPT operating voltage window
- 90–485Vdc
- Low-voltage PV input
- 1,300W max, 22A / 22A, 12–60Vdc operating, 60Vdc max open-circuit
- MPPT tracking efficiency
- 99.9%
- Battery inverting efficiency
- >92%
- Grid / generator input
- 120Vac (L1/N, L2/N) / 240Vac (L1/L2), 85–140Vac, 50/60Hz
- Bypass overcurrent
- 60A / 60A (L1, L2)
- Charging modes
- Solar only, grid priority, solar priority, hybrid
- System configurations
- Plugged loads; UPS-style backup panel; CT metering or external automatic transfer switch (the last two once UL certification is issued)
- Parallel capability
- Up to 6 units: 72kW output, about 60kWh storage
- Certifications
- UL 9540, UL 9540A, UL 1741, UL 1973 and FCC in progress, expected by the end of December 2026. Not yet listed
- Protection rating
- IP20, indoor use only
- Ambient temperature
- Discharging: 5°F to 131°F (−15°C to 55°C), derated above 113°F (45°C). Charging: 32°F to 131°F (0°C to 55°C)
- Cooling
- Forced air
- Noise
- <60dB
- Communication
- CAN, parallel communication port, CT port, dry contact port, Wi-Fi monitoring through the POWISER app
- Dimensions (L×W×H)
- 19.6 × 29.8 × 35.2 in (498 × 758 × 894 mm)
- Weight
- 309 lb (140 kg)
- Mobility
- Locking casters, removable rolling base
- Warranty
- 10 years, home energy storage
Overload protection is staged: above 102% of rated load the unit alarms and shuts output down after 5 minutes, above 110% after 10 seconds, and above 125% after 5 seconds.
Build out the rest of the garage
Plain answers
Certification, solar sizing and moving it
Is it UL listed?
Not yet. Certification to UL 9540, UL 9540A, UL 1741 and UL 1973, plus FCC, is expected by the end of December 2026. Until the certificates are issued, treat this as an off-grid and plugged-loads unit rather than a grid-tied installation, and check what your local authority requires before feeding household circuits.
Can it run 240V equipment?
Yes. Output is split-phase 120/240Vac, with a dedicated 30A 120V/240V outlet alongside a 30A 120V and three 20A 120V outlets.
Does it need an electrician?
Not for plugged loads: roll it in and plug equipment into its outlets. Feeding household circuits through a backup panel or a transfer switch does need a licensed electrician, requirements vary by jurisdiction, and that option waits on UL certification. It is rated IP20, so it must stay indoors.
How much solar can I connect?
Two high-voltage MPPT channels take up to 10,000W combined at 32A per channel, with a 500Vdc open-circuit ceiling. A separate 1,300W input accepts 12–60Vdc panels directly. The high-voltage channels track between 90 and 485Vdc. Size each string so its open-circuit voltage stays under 500Vdc with margin for cold weather, when Voc rises.
How is it different from the H12 PRO?
Same 12kW split-phase output and the same 10 ms transfer. The H12 PRO mounts to a wall and hardwires into your panel; the ULTRA 12K rolls on casters and plugs in. The H12 PRO takes up to two 10kWh expansion packs, while the ULTRA 12K's 10.24kWh battery is not expandable.
Can I add more later?
Up to six units run in parallel for 72kW of output and about 60kWh of storage. A single unit's battery is not expandable.
Is it easy to move between locations?
It rolls on locking casters from the garage to an RV, a cabin or a job site and locks in place once set up. At 309 lb, getting it over a threshold is a two-person job, and every location has to be indoors.
Before you order
Availability. POWISER's next U.S. stock of the ULTRA 12K is due at its U.S. warehouse at the end of December 2026. Orders placed now are expected to ship in January 2027.
At 309 lb (140 kg) the ULTRA 12K ships by freight on a pallet, not parcel: Class 9 hazardous goods, ground or LTL freight only, no air. Freight is a flat $750 within the 48 contiguous states, shown at checkout before you pay; we do not ship to Alaska or Hawaii. Expect curbside delivery on a liftgate truck; the carrier will not bring it into the garage. Someone must be present to receive it, and the crate should be inspected before signing.
For plugged loads there is nothing to install. Feeding household circuits through a backup panel or an external transfer switch requires a licensed electrician and waits on UL certification. The IP20 rating means indoor use only, never a carport or an exposed wall.
Warranty: 10 years on the home energy storage system, for units bought from an authorized dealer. Contact us first with any fault, and we take the claim to POWISER. Returns are handled under our return and refund policy. Freight items must be inspected at delivery and any transit damage noted on the carrier paperwork before signing.
