US-S / US-R Series 120/240 V split-phase hybrid inverter, 3.6–12 kW
Built for the North American panel: 120/240 V split-phase output, anti-reflux CT in the box, and a 10 ms transfer that keeps a well pump and a furnace controller alive.
Product image
- Brand
- HighIdea
- Type
- Split-phase 120/240 V hybrid inverter, US market
- Typical applications
- US residential backup, off-grid cabins, workshops, small commercial 120/240 V systems
- Models in range
- US-R3600-24, US-R3600-48, US-S4000-24, US-R6500-48, US-R6200-48, US-R7200-48, US-R12000-48
- Category
- Solar Inverters
A North American product, not an export afterthought
A 120/240 V split-phase panel is not the same as a 230 V single-phase panel with a different plug. The inverter has to supply two live legs 180° apart, carry the neutral imbalance, and handle 240 V loads like a well pump or a dryer without unbalancing the legs.
The US-S/US-R series is built around that. Models run from 3.6 kW to 12 kW on 24 V and 48 V batteries, with L1, L2, N and PE landed separately and a neutral sized for the worst-case imbalance. The 6-unit parallel limit covers residential expansion and light commercial work.
Anti-reflux and battery-free operation
Many US utilities prohibit export from a residential system, or require a zero-export relay. The CT supplied with the inverter measures the service entrance current and holds export at zero, which is simpler and cheaper than a dedicated relay.
Battery-free operation is the other feature that matters in that market: a customer can install PV with the inverter now and add a battery in two years. The inverter runs the loads from PV and grid in the meantime, and the battery is a later purchase rather than a precondition.
Service and updates
Firmware is updated over the air through the monitoring portal. On a remote cabin or a site 300 km from the nearest installer, that is the difference between a service visit and a remote fix.
Key Features
- 3.6 kW to 12 kW across seven models, 24 V and 48 V battery
- 120/240 V split-phase output, L1 + L2 + N + PE
- Anti-reflux CT supplied as standard
- Transfer time under 10 ms for critical loads
- Up to 6 units in parallel, single- or three-phase arrangement
- Battery-free operation: PV and grid can supply loads without a battery
- Remote diagnosis and OTA firmware updates
- Handles continuous surge loads when mixed with the grid
Applications
US residential backup
120/240 V output feeds a split-phase panel directly; the CT prevents export where the utility forbids it.
Well pumps and HVAC
Surge tolerance covers pump and compressor starts that trip smaller inverters.
Cabins and workshops
Battery-free mode runs loads from PV during the day, with the battery added later for night coverage.
FAQ
Does it work on a 120 V-only panel?
What is anti-reflux CT?
Can I install it without a battery?
How many in parallel?
Specification reference
| Parameter | US-R3600-24 | US-R3600-48 | US-S4000-24 | US-R6500-48 | US-R6200-48 | US-R7200-48 | US-R12000-48 |
|---|---|---|---|---|---|---|---|
| PV Input | |||||||
| Max. Input Power (kW) | 4.5 | 4.5 | 5 | 4.5+4.5 | 9 | 4.5+4.5 | 6+6 |
| Open Circuit Voltage (VDC) | 300 | 300 | 500 | 300 | 500 | 500 | 500 |
| MPPT Voltage (VDC) | 90~260 | 90~260 | 60~450 | 90-260 | 90~450 | 90Vdc~450Vdc | 90Vdc~450Vdc |
| Max. Input Current (A) | 27 | 27 | 18 | 22+22 | 27 | 16A+16A | 22A+22A |
| PV Input Short-circuit Current (A) | — | — | 22 | — | — | — | — |
| Number of MPPT Trackers | 2 | 2 | — | 2 | 1 | 2 | 2 |
| AC Input | |||||||
| Rated Input Voltage (VAC) | 120Vac±5% | 120Vac±5% | 120Vac±5%; L+N+PE | 120Vac ±5% | 120(L1/N, L2/N) / 240Vac(L1/L2) | 120(L1/N, L2/N) / 240Vac(L1/L2) | 120(L1/N, L2/N) / 240Vac(L1/L2) |
| Voltage Range (VAC) | (90Vac~140Vac)±2% | (90Vac~140Vac)±2% | (90Vac~140Vac)±2% | (90Vac~140Vac)±2% | 90~140Vac ±2% | 90~140Vac ±2% | 90~140Vac ±2% |
| Frequency (Hz) | 50Hz/60Hz (Auto Detect) | ||||||
| Max. Bypass Input Current (A) | 40 | 40 | 40A | 63 | 2-pole, 40A/40A (L1/L2) | 2-pole, 40A/40A (L1/L2) | 2-pole, 40A/40A (L1/L2) |
| CT count | — | — | 1 | — | — | — | — |
| Max.Parallel Quantity | — | 6 | — | 6 | — | — | — |
| AC Output | |||||||
| Rated Capacity (kW) | 3.6 | 3.6 | 4000 | 6.5 | Split-phase 6200; Single-phase 4800 | Split-phase 7200; Single-phase 6000 | Split-phase 12000; Single-phase 7200 |
| Voltage (VAC) | 120 | 120 | 100/110/120/127 | 120 | 120Vac(L1/N, L2/N)/240Vac(L1/L2) | 120Vac(L1/N, L2/N)/240Vac(L1/L2) | 120Vac(L1/N, L2/N)/240Vac(L1/L2) |
| Frequency (Hz) | 50/60 ±0.3Hz | ||||||
| Output Wave Form | Pure Sine Wave | ||||||
| Motor Load Performance | 2HP | 2HP | 2HP | 4HP | 3HP | 4HP | 6HP |
| Battery Mode Overload Capacity | 5min@102%~110%Load; 10s@110%~125%Load; 5s@Load>125% | 5min@102%~110%Load; 10s@110%~125%Load; 5s@Load>125% | 1min@102%~120%Load; 10s@120%~200%Load | 5min@102%~110%Load; 10s@110%~125%Load; 5s@Load >125% | 5min@102%~110%Load; 10s@110%~125%Load; 5s@Load >125% | 5min@102%~110%Load; 10s@110%~125%Load; 5s@Load >125% | 5min@102%~110%Load; 10s@110%~125%Load; 5s@Load >125% |
| Battery Mode Max. Efficiency | 91% | 91% | 93% | 91% | 91% | 91% | 91% |
| Switch Time (ms) | <10 | ||||||
| Battery | |||||||
| Nominal Voltage(VDC) | 24VDC | 48VDC | 24VDC | 48VDC | 48VDC | 48VDC | 48VDC |
| Max. AC Charge Current (A) | 80 | 80 | 100 | 100 | 100 | 150 | 160 |
| Max. PV Charge Current (A) | 120 | 80 | 100 | 150 | 120 | 150 | 220 |
| Max. Charge Current (PV + AC) (A) | 120 | 80 | 100 | 150 | 120 | 150 | 220 |
| Max.Discharge Current (A) | — | — | 170 | — | — | — | — |
| Operating Voltage Range | 21.6Vdc～29.2Vdc | 43.2Vdc～58.4Vdc | 21.6Vdc～29.2Vdc | 43.2Vdc~58.4Vdc | 43.2Vdc~58.4Vdc | 43.2Vdc~58.4Vdc | 43.2Vdc~58.4Vdc |
| General Data | |||||||
| reveal | LCD | ||||||
| communication | USB/RS485(/WiFi/GPRS)/Dry Contact Control | USB/RS485(/WiFi/GPRS)/Dry Contact Control | USB/RS485 | USB/RS485(/WiFi/GPRS)/Dry Contact Control | USB/RS485(/WiFi/GPRS)/Dry Contact Control | USB/RS485(/WiFi/GPRS)/Dry Contact Control | USB/RS485(/WiFi/GPRS)/Dry Contact Control |
| Monitoring | WiFi | ||||||
| Ingress Protection | IP20 | IP20 | IP21 | IP20 | IP20 | IP20 | IP20 |
| Operating Temperature | -10 °C~55 °C | ||||||
| Relative Humidity | 5%～95% (Non-condensing) | ||||||
| Max. Operating Altitude | 4000m (Derating above 2000m) | ||||||
| DIMENSION | |||||||
| LxWxH (products size, mm) | 410x300x130mm | 410x300x130mm | 420x316x130mm | 550x360x140mm | 483x353x142mm | 580*360*127mm | 600*450*140mm |
| LxWxH (package size, mm) | 486x376x186mm | 486x376x186mm | 500x396x210mm | 616x426x196mm | 536x406x211mm | 630x410x177mm | 660x510x200mm |
| NW (Kg) | 6.2 | 6.3 | 7.2 | 11 | 11.5 | 14.2 | 23.3 |
| GW (Kg) | 7.2 | 7.3 | 7.9 | 12.5 | 13 | 15.7 | 25 |
| Quantity 20GP | 616 | 616 | 616 | 430 | 520 | 470 | 320 |
| Quantity 40GP | 1276 | 1276 | 1320 | 930 | 1120 | 990 | 680 |
| Quantity 40HQ | 1508 | 1508 | 1420 | 1110 | 1344 | 1170 | 816 |
Specifications subject to the latest factory data. Final configuration is sized against the actual load, backup runtime and site power conditions — this table is for pre-selection only.
Specifications subject to the latest revision; need other technical documents? Ask our engineers.