Name: 3kW Off-Grid Solar Inverter
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3kW Off-Grid Solar Inverter

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Product Description

3kW Off-Grid Solar Inverter

Certifications: CE, IEC 62109, IEC 61727, UL, TUV, RoHS

Rated Output Power: 3,000W / 3kVA

Peak Power: 6,000W (5 seconds)

Battery Voltage: 24V / 48V DC (varies by model)

Output Waveform: Pure Sine Wave

MPPT Charge Controller: Built-in, 80A (typical)

Max PV Input Power: 4,000W ~ 5,000W

Protection Level: IP21 (indoor) / IP65 (outdoor optional)

Transfer Time: 10ms (UPS mode) / 20ms (Appliance mode)

Product Description

The 3kW Off-Grid Solar Inverter is a core independent power supply device designed for areas without grid access or with unstable grids. It integrates PV charge control, battery charge/discharge management, DC-AC inversion, and load power supply. Using a 48V/24V low-voltage battery bank as the energy storage core, the system efficiently harvests PV power through a built-in MPPT charge controller and outputs pure sine wave AC power for loads, achieving fully independent off-grid operation.

The product adopts high-frequency switching technology with high power density, compact size, light weight, and high overall efficiency. The built-in 80A MPPT solar charge controller has an MPPT voltage range of 60~450VDC (varies by model) and supports a maximum PV input power of 4,000W~5,000W, allowing PV oversizing to boost generation during early/late hours and cloudy days. The pure sine wave output has a total harmonic distortion of ＜3%, safely driving motors, compressors, switching power supplies, and various inductive and capacitive loads.

The system supports flexible priority settings among PV, grid/generator, and battery, selectable via LCD screen among PV priority, grid priority, or battery priority modes. Battery compatibility is strong, supporting lead-acid (AGM, Gel, Flooded) and lithium-ion batteries, with lithium charging strategies adaptive to BMS (RS485/CAN communication).Some models support parallel expansion of up to 6~12 units or three-phase configuration, flexibly expandable to 18kW~36kW for various off-grid power needs. The product is equipped with comprehensive protection functions including battery over-discharge protection, overload protection, over-temperature protection, short circuit protection, and output overvoltage protection, ensuring safe and reliable system operation.

Application Scenarios

Residential Off-Grid PV Systems — Provide independent power for daily lighting, TV, refrigerator, fans, and other household appliances in remote mountainous areas, plateaus, and pastoral regions without grid coverage

RV & Vehicle Power Systems — Provide AC power for RVs, campervans, and marine systems, supporting PV charging and complementary grid/generator charging

Communication Base Stations & Monitoring Systems — Provide stable and reliable off-grid power for communication base stations, microwave relay stations, and video surveillance equipment in remote areas

Emergency Backup Power — Provide uninterrupted power for emergency lighting, communication equipment, and medical devices during natural disasters or grid failures

Islands & Border Outposts — Work with PV modules to build independent microgrids, solving power supply issues for remote islands and border outposts

Agriculture & Field Operations — Provide mobile off-grid power for agricultural irrigation pumps, geological exploration equipment, and temporary construction sites

Small Commercial & Pastoral Areas — Provide economical and practical independent power solutions for pastoral shops, small clinics, and tourist stations

Product Parameters

The following are general specifications for mainstream 3kW off-grid inverters (typical configuration: 48V battery platform, 120VAC output):

Category	Item	Specification
DC Input Parameters	Rated Battery Voltage	48 VDC / 24 VDC (varies by model)
	Battery Voltage Range	40 VDC ~ 60 VDC (48V system) / 21 VDC ~ 30 VDC (24V system)
	Float Charging Voltage	54 VDC (48V system)
	Overcharge Protection Voltage	60 VDC ~ 63 VDC (48V system)
	Battery Type	Lead-acid (AGM/Gel/Flooded) / Li-Ion / Self-Defined
	Li-ion BMS Communication	RS485 / CAN
PV Input Parameters	Built-in MPPT Charge Controller	Yes, 80A (typical)
	Max PV Input Power	4,000W ~ 5,000W
	Max PV Open-Circuit Voltage	145 VDC ~ 500 VDC (varies by model)
	MPPT Voltage Range	60 VDC ~ 450 VDC (varies by model)
	Max Solar Charge Current	80 A
	Number of MPPT	1
	Max PV Input Current	15 A ~ 18 A
AC Output Parameters	Rated Output Power	3,000W / 3,000VA
	Peak Power	6,000W (5 seconds)
	Rated Output Voltage	110V / 120V / 220V / 230V (varies by model)
	Output Voltage Regulation	±5%
	Rated Output Frequency	50Hz / 60Hz (auto-sensing)
	Output Waveform	Pure Sine Wave
	Output Current	30 A (at 120VAC output)
	Peak Efficiency (Inverter)	93%
	Peak Efficiency (PV to Inverter)	97% ~ 98%
	Overload Protection	5s @ ≥150% load; 10s @ 110%~150% load
	Crest Factor	3:1
	Admissible Power Factor	0.6 ~ 1 (inductive or capacitive)
AC Input Parameters	Nominal Input Voltage	110V / 120V / 220V / 230V
	Acceptable Voltage Range	95~140VAC (PC mode) / 65~140VAC (Appliance mode) / 90~140VAC (UPS mode)
	Max AC Charge Current	40 A ~ 60 A (varies by model)
	Transfer Time (UPS Mode)	10 ms
	Transfer Time (Appliance Mode)	20 ms
Efficiency Parameters	Max Efficiency	93% (inverter) / 98% (solar charging)
	Line Mode Efficiency	＞95%
	No-Load Loss	2 W
General Parameters	Protection Level	IP21 (indoor) / IP65 (outdoor optional)
	Operating Temperature	0℃ ~ 50℃ / -10℃ ~ 50℃ (varies by model)
	Storage Temperature	-15℃ ~ 60℃
	Relative Humidity	5% ~ 95% (non-condensing)
	Cooling Method	Smart fan cooling
	Installation	Wall-mounted
	Dimensions (W×H×D)	Approx. 309×505×147mm ~ 448×315×122mm (varies by model)
	Net Weight	Approx. 10kg ~ 13.3kg
Protection Functions	DC Protection	Battery over-discharge, overcharge, reverse polarity protection
	AC Protection	Output overload, short circuit, output overvoltage protection
	Other Protection	Over-temperature protection, fan failure detection
Communication & Monitoring	Communication Interfaces	RS485 / RS232 / USB / Dry contact
	Monitoring	LCD screen / WiFi (optional) / Mobile APP (optional)
	Parallel Expansion	Up to 6~12 units (varies by model)
	Parallel Mode	Single-phase parallel / Three-phase parallel / Split-phase output

System Components

The system consists of a PV MPPT charge control unit (with maximum power point tracking module and 80A charge controller), battery charge/discharge management unit (supporting adaptive management of lead-acid and lithium-ion batteries), DC-AC inversion unit (high-frequency pure sine wave output, rated power 3kW), AC bypass and charging unit (grid/generator input switching and battery charge management), intelligent control and protection unit (including LCD display, multi-mode priority settings, and comprehensive protection functions), communication and monitoring unit (including RS485/RS232 interfaces and optional WiFi monitoring module), and wall-mounted metal enclosure. The system supports flexible priority settings among PV, grid/generator, and battery, with operation parameter viewing and mode switching via LCD screen or mobile APP.

Factory Display

FAQ

Q : How much money can a C&I energy storage system save my business?
A : Savings depend on your electricity consumption, local peak/off-peak price differentials, and system capacity. For a 215kWh system with one charge-discharge cycle per day, assuming a price differential of $0.10/kWh, a single cycle can save approximately $21.50. Actual returns vary by local utility rates and load profiles. We can provide a customized ROI analysis for your business.
Q : How do I choose the right storage capacity for my business?
A : Capacity selection is based on two key factors: peak load power (determines PCS rating) and energy shifting demand (determines battery capacity). Typically, we analyze your past 12 months of utility bills to calculate maximum demand and off-peak charging needs. We recommend leaving about 20% capacity margin for future load growth.
Q : What is the typical payback period for a C&I ESS?
A : The payback period for C&I energy storage projects is typically 3–6 years, depending on local peak/off-peak price differentials, system costs, government incentives, and your company's self-consumption capability. With declining battery costs and ongoing power market reforms, payback periods continue to shorten.
Q : Liquid-cooled vs. air-cooled – which should I choose?
A : Here's a quick comparison:
Liquid-cooled series: Provides precise thermal control with temperature differences maintained within < 3°C, significantly extending battery cycle life and improving efficiency in high-temperature environments. Ideal for high-density, high-power projects.
Air-cooled series: Mature technology with lower upfront investment and simpler maintenance. Suitable for small to medium-sized projects or cost-sensitive applications.