Full specifications

Brand	SolarMax
Inverter Specifications
Model	SM-ORION-PLUS-4KW
Inverter type	Off-Grid
Grid type	Single Phase
PV Input Data
Max DC input power	5600 W
PV input voltage	500 V
MPPT voltage range	60-450 V
Max. PV input current	40 A
No. of MPPT	1
AC Output Data
Rated AC output	4000 W
Rated voltage	230 V
Battery Data
Battery type	Lithium & Lead-Acid
Battery voltage range	24 V
Max. charging current	120 A
Max. discharging current	120 A
BMS	USB / RS232 / RS485 / WiFi / Dry-contact
Protections
PV reverse polarity detection	Yes
Insulation resistance detection	Yes
Leakage current detection	Yes
AC overcurrent protection	Yes
Output short circuit protection	Yes
Surge protection	Yes
Over voltage protection	Yes
General Specifications
Weight	10 kg
Operating temperature	-10°C ~ +50°C
Max. efficiency	93%
Size (W×H×D)	300 × 400.2 × 136 mm

Note: No grid export and no net metering: the datasheet has no grid-output or feed-in section. It runs the load from PV and battery and takes utility or generator as a backup charging source, which is not the same as being grid-interactive. 40 A of PV input current is unusually high for a 4 kW unit: it takes 5600 W of array on a single tracker, so a 24 V system can be genuinely oversized. 120 A solar charging and 100 A from utility, 120 A combined. MPPT window 60-450 V on a 500 V ceiling. Surge 8000 VA, peak efficiency 90-93%. Dual output for smart load management, RGB status ring, 4.3-inch colour LCD, built-in WiFi with OTA firmware upgrade. Battery-independent design, so it will run on PV alone. 10 kg, rated -10 to +50 degC. Price shown is the sunsolar.pk listing, Rs 102,000 (in stock), read 22 September 2026. w11stop.com and Kamal Solar do not list this model.