Full specifications

Brand	SolarMax
Inverter Specifications
Model	SM-ORRA-3KW
Inverter type	Off-Grid
Grid type	Single Phase
PV Input Data
Max DC input power	4000 W
PV input voltage	450 V
MPPT voltage range	30-400 V
Max. PV input current	18 A
No. of MPPT	1
Startup voltage	70 V
AC Output Data
Rated AC output	3000 W
Rated voltage	230 V
Battery Data
Battery type	Lithium & Lead-Acid
Battery voltage range	24 V
Max. charging current	100 A
Max. discharging current	100 A
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	7.2 kg
Operating temperature	-10°C ~ +50°C
Max. efficiency	93%
Size (W×H×D)	288 × 357 × 90 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. Note the rating is conditional: 3 kW is available with PV and battery together, but only 2.5 kW on battery alone - size against the lower figure if the load runs at night. 24 V bank with 100 A combined charging (80 A of that from utility). MPPT window 30-400 V on a 450 V open-circuit ceiling, 18 A input, minimum 60 V to start without a battery connected. Surge is twice rated power for 5 s. Transfer 10 ms in UPS mode, 20 ms for appliances. 3-step charging with separate flooded and AGM/gel set points. 7.2 kg, rated -10 to +50 degC.