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Household Inverter丨Off-Grid Inverter丨BK-MKSII-5KVA
PRODUCT PARAMETERS
The BK-INV series is a wall-mounted off-grid all-in-one photovoltaic inverter designed specifically for residential villas, rural pastoral areas, RV camping, small commercial spaces (convenience stores, clinics), and emergency backup scenarios. It integrates an MPPT solar controller, pure-sine-wave inverter, smart battery charger, and UPS-level transfer switch into a single compact unit, realizing autonomous scheduling of solar, battery, and mains power.
- Four-in-One Highly Integrated Design
- Double-Conversion Online UPS for Uninterrupted Power
- Ultra-Wide MPPT Range for Efficient Solar Harvesting
- High Efficiency & Energy Savings
- Flexible Parallel Expansion & Multi-Scene Adaptation
- Rugged Design for Harsh Environments
- Smart Monitoring & Easy Operation
- Comprehensive Safety Protection
Description
FAQs
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Description
Product Overview
BK-MKSII-5KVA is a 5 kVA / 5 kW wall-mounted off-grid all-in-one inverter. It integrates an MPPT solar controller, pure-sine-wave inverter, smart battery charger and UPS-level transfer switch in a single 11 kg box. Without the grid, it autonomously schedules solar, battery and mains power to deliver 24-hour green energy for homes and small businesses. Only 480 mm wide, it can be wall-mounted and commissioned in 30 minutes—literally “a solar power plant in a box”.
Application
- Residential / Villas
3–5 kW rooftop PV + 5–10 kWh battery for 80 % self-consumption.
- Rural & Pastoral Areas
Stand-alone micro-grid powering pumps, refrigerators, lighting and internet.
- RV & Camping
48 V Li-ion + 600 W roof panels for 3–5 days off-grid power.
- Small Commercial
Convenience stores, clinics, telecom shelters, security systems—automatic backup when the grid fails.
- Emergency Backup
Parallels with diesel gensets to cut fuel consumption by 50 %.
Product Features
- Four-in-one highly integrated design
saves space, reduces cabling, and minimizes labor—installation can be completed by a single person.
- Double-conversion online UPS
Seamless switching in 10 ms, ensuring zero power interruptions for critical loads such as computers and medical equipment.
- Ultra-wide MPPT
Input voltage range of 120–430 V, single-channel 4.5 kW tracking, and full-power generation even under low-light or high-temperature conditions.
- High Efficiency and Energy Savings
Input power factor of 0.99, overall efficiency of 95%, extending battery runtime by 8–10% under equivalent conditions.
- Multi-Unit Parallel Operation
Supports up to 9 units in parallel, scaling up to 45 kVA, ideal for villa or small commercial upgrades.
- Battery Compatibility
Fully compatible with lead-acid, AGM, and lithium-ion batteries; BMS adaptive control; three-stage/balanced charging extends cycle life by 20%.
- Rugged Environment Design
Full-power operation from -10°C to 50°C; removable dust filter; suitable for desert, island, and high-altitude environments.
- Smart Monitoring
RS232 + USB + dry contacts; supports remote monitoring of power generation, consumption, and SOC via an app.
Specifications
| Model | BK- MKSII-5KVA | |
| Product Type | Household Photovoltaic Inverter | |
| Power Capacity | 5000VA | |
| AC Input | Voltage | 230VAC |
| Voltage Range | 170-280Vac (for personal computers) 90-280Vac (suitable for household appliances) | |
| Frequency | 50/60HZ | |
| PV input | Maximum PV array power | 4500W |
| Maximum PV array open circuit voltage | 450Vdc | |
| MPPT Range @operating voltage | 120Vdc-430Vdc | |
| Rated Voltage | 360V | |
| MPPT Quantity | 1 | |
| Output | Voltage | 230V±5% |
| Frequency | 50HZ | |
| Efficiency | ≥90% | |
| Maximum Output | 5000W | |
| Switching Time | 10ms (UPS), 20ms (household appliances) | |
| Harmonic | 3% | |
| Overload | 5s@≥150%load;10s@110%-150%load | |
| Mains mode | Voltage | 230Vac±5% |
| Frequency | 50HZ | |
| Efficiency | ≥95% | |
| Battery | Voltage | 48V |
| Charging | Three-stage charging | |
| Maximum Charging Current | 80A | |
| Cold start voltage | 46V | |
| Parallel connection function | Supports up to 9 units in parallel | |
| Battery type | Lead-acid, AGM, lithium-ion | |
| Protection function | Output short circuit, overload, and over-temperature protection functions, etc. | |
| Communication port | RS232, USB, dry contact | |
| Environment | Operating Temperature | -10℃-50℃ |
| Storage Temperature | -15℃-60℃ | |
| Humidity | 5%-95% | |
| Physical | dimensions （D×W×H） | 480x310x125mm |
| 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.
