
Voltronic Axpert MAX II TWIN HMI 12K Off-Grid Solar Inverter
- Parallel Capability:YES, 12 units
- Selectable Voltage Range:170-280 VAC (For Personal Computers)

The Axpert MAX II TWIN HMI PV11K PV13K PV18K Axpert MAX II TWIN HMI 11K is an off-grid solar inverter rated Axpert MAX II TWIN HMI 11K.
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The Axpert MAX II TWIN HMI PV11K PV13K PV18K Axpert MAX II TWIN HMI 11K is an off-grid solar inverter rated Axpert MAX II TWIN HMI 11K. Every figure on this page is read from the manufacturer's manual for the Axpert MAX II TWIN HMI PV11K PV13K PV18K series.
Specifications last updated 18 August 2026
| Parallel Capability | YES, 12 units |
|---|---|
| Selectable Voltage Range | 170-280 VAC (For Personal Computers) |
| AC Voltage Regulation (Batt. Mode) | 230VAC ± 5% |
| Efficiency (Peak) | 93% |
| Communication Interface | USB/RS232/RS485/WiFi/Dry-contact |
| Rated Power | 11000VA/11000W |
| Surge Power | 22000VA |
| Maximum PV Array Power | 13000W (6500W x 2) |
| Maxmum Solar Charge Current | 150A |
| Maximum AC Charge Current | 150A |
| Maximum Charge Current | 150A |
| Floating Charge Voltage | 54 VDC |
| Maximum PV Input Current | 27A x 2 (MAX 40A) |
| Waveform | Pure sine wave |
| Solar Charger Type | MPPT |
| Maximum PV Array Open Circuit Voltage | 500 VDC |
| Humidity | 5% to 95% |
|---|---|
| Operating Temperature | -10°C to 50°C |
| Storage Temperature | -15°C to 60°C |








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Read: How to Monitor Voltronic Inverters and UPS via WiFi →The Axpert MAX II TWIN HMI 11K is rated 11000VA/11000W continuous, with 22000VA available on surge for the second a motor or a compressor starts. Size the load you actually intend to run against the continuous figure, never against the surge one.
The Axpert MAX II TWIN HMI 11K takes up to 13000W (6500W x 2) of PV array. The string has to stay below 500 VDC open-circuit — that ceiling is reached on a cold bright morning, not at noon.
Peak efficiency is 93%. Whatever is not converted leaves as heat, so the Axpert MAX II TWIN HMI 11K needs clear air around it and a mounting spot that is not the hottest wall in the building.