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Household Inverter丨Off-Grid Inverter丨BK-SCMK-3KVA
PRODUCT PARAMETERS
The BK-INV series is a wall-mounted off-grid all-in-one photovoltaic inverter designed specifically for 120V homes (North & Latin America), RVs/camper vans, rural pastoral areas, small commercial spaces (convenience stores, clinics), and emergency backup scenarios.
- All-in-One Compact Design for Space-Saving Deployment
- Dual-Mode Solar Charging for Efficient Energy Harvesting
- UPS-Grade Seamless Power Switching
- 2× Surge Power for Heavy Load Startup
- Flexible Battery Management & Parallel Expansion
- Full-Stack Communication & Remote Monitoring
- Harsh-Environment Adaptability
- Comprehensive Safety Protection
Description
FAQs
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Description
Product Overview
BK-SCMK-3KVA is a 3 KVA / 2.4 KW wall-mounted off-grid all-in-one inverter that integrates a dual-mode (PWM+MPPT) solar charger, pure-sine-wave inverter, 24 V intelligent battery charger and UPS-grade transfer switch. Measuring only 120 × 295 × 468 mm and weighing 11 kg, it can be wall-mounted and commissioned in 30 minutes, delivering 24-hour stable green power for 120 V homes, RVs and small commercial sites.
Application
- 120 V homes in North & Latin America
3–4 kW rooftop PV + 5–10 kWh battery for 70 % self-consumption.
• RVs / camper vans
24 V system + 400–600 W roof panels for 2–3 days off-grid power.
• Rural & pastoral areas
Stand-alone micro-grids powering water pumps, freezers, lighting and Wi-Fi where grid is absent or unstable.
• Small commercial
Convenience stores, clinics, EV chargers with automatic backup, reducing diesel dependence.
• Emergency power
Peak-shaving with small gensets, cutting fuel use by 30 % and lowering noise & emissions.
Product Features
- Dual-mode charging
PWM baseline + MPPT high-efficiency tracking, 30–80 V / 2 kW PV input maintains full output even in weak light.
- 10 ms true UPS
Seamless switch among grid, solar and battery—zero interruption for PCs and routers.
- 2× surge power
Delivers 6 kVA for 5 seconds, easily starting inductive loads such as refrigerators and water pumps.
- 24 V battery bay
Compatible with lead-acid, AGM and Li-ion; 60 A adjustable charging current; battery swap or expansion in 3 minutes.
- Six-unit parallel
Single unit 3 kVA, scalable up to 18 kVA on demand.
- Full-stack communication
RS232 + USB + dry contact, supporting PC software and mobile app remote monitoring.
- Harsh-environment ready
Full power from –10 °C to +50 °C, washable dust filter, suitable for deserts, islands and highlands.
Specifications
| Model | BK-SCMK-3KVA | ||
| Product Type | Residential photovoltaic inverter | ||
| Power Capacity | 3000VA | ||
| AC Input | Voltage | 120VAC | |
| Voltage Range | 95-150Vac (for personal computers) 65-150Vac (suitable for household appliances) | ||
| Frequency | 50 Hz/60 Hz (automatic detection) | ||
| PV Input | PWM | MPPT | |
| Rated Power | 1250W | 2000W | |
| Efficiency | 98.5% | 98% | |
| Maximum Open-circuit Voltage Of Photovoltaic array | 80VDC | 145VDC | |
| Operating Voltage Range | 30~40VDC | N/A | |
| Maximum Photovoltaic Array Voltage Range | N/A | 30~80VDC | |
| Maximum Charging Current | 110A | 140A | |
| Output Parameters (PV/Battery mode) | Voltage | 110/120VAC±5% | |
| Frequency | 50 Hz/60 Hz | ||
| Efficiency | ≥90% | ||
| Maximum Output Power | 2400W | ||
| Switching Time | 10 ms (UPS), 20 ms (household appliances) | ||
| Surge Power | Twice the rated capacity for 5 seconds | ||
| Overload Capacity | 5s@≥150%load;10s@110%-150%load | ||
| Mains Mode | Voltage | 110/120VAC±5% | |
| Frequency | 50 Hz | ||
| Efficiency | 95% (resistive load, battery saturated state) | ||
| Battery | Voltage | 24V | |
| Charging Method | Three-stage charging | ||
| Charging Current | Adjustable 2A/10A/20/30A/40/50/60A | ||
| Cold Start Voltage | 23V | ||
| Parallel Operation Function | Up to 6 units in parallel | ||
| Battery Type | Lead-acid, AGM, lithium-ion | ||
| Protective Function | Output short circuit, overload, and over-temperature protection functions, etc. | ||
| Communication | RS232, USB, dry contact | ||
| Environment | Operating Temperature | -10℃-50℃ | |
| Storage Temperature | -15℃-60℃ | ||
| Humidity | 5%-95% | ||
| Physical | dimensions （D×W×H） | 120x295x468mm | |
| Weight | 11kg | ||
FAQs
What is UPS?
UPS stands for Uninterruptible Power Supply and is a device that provides a continuous supply of power to protect critical loads from power failures or fluctuations.
What is the main role of UPS?
The main role of a UPS is to provide a backup power source to ensure that critical equipment can continue to operate when utility power is interrupted or unstable, avoiding data loss or equipment damage.
What are the types of UPS?
UPS is mainly divided into three types: offline, online and online interactive.
How to choose the power capacity of UPS?
When choosing the power capacity of the UPS, you need to consider the total power demand of the load, it is usually recommended to choose a slightly larger than the total load power of the UPS to ensure sufficient standby time.
How is the standby time of a UPS determined?
The standby time of a UPS depends on the battery capacity and load power. Standby time usually ranges from 10 minutes to several hours, and the specific needs can be determined according to the actual application scenario.
