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BLUETTI APEX 300 + B500K | 7.88 kWh Power Station Combo
€3,498.00
BLUETTI APEX 300 + B500K combo with 3,840W output, 7.88 kWh LiFePO4 storage, UPS backup, solar charging and expandable BLUETTI ecosystem.
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Modular power station combo with 7.88 kWh storage
BLUETTI APEX 300 + B500K power station combo
The BLUETTI APEX 300 + B500K is a powerful and scalable energy solution for users who need more than a standard portable power station. This bundle combines the BLUETTI APEX 300 power station with 2,764.8 Wh internal LiFePO4 battery capacity and a BLUETTI B500K expansion battery with 5,120 Wh capacity. Together, the system delivers a total storage capacity of 7,884.8 Wh, or more than 7.88 kWh.
With 3,840W continuous AC output, up to 7,680W peak output and a fast UPS backup function, this combo is suitable for emergency power, campers, tiny homes, workshops, off-grid use, mobile applications and situations where reliable power supply is essential.
7,884.8 Wh total capacity 3,840W continuous output LiFePO4 battery technology UPS backup
Why this BLUETTI combo is a strong choice
The APEX 300 is the central power station in this set. The B500K significantly increases the available runtime, allowing you to power appliances for longer without relying on the grid. This makes the combination especially interesting when you need a quiet, portable and expandable power supply for both home and mobile use.
• High total storage capacity of 7,884.8 Wh
• 3,840W continuous AC output for heavy-duty appliances and professional use
• 7,680W peak output for devices with high start-up power demand
• LiFePO4 battery technology for safety and long service life
• UPS backup function for fast switching during power outages
• Expandable within the BLUETTI ecosystem
• Can be combined with solar panels and optional BLUETTI accessories
• Suitable for emergency backup, campers, workshops, off-grid homes, tiny houses and events
Large storage capacity
The APEX 300 and B500K together provide 7,884.8 Wh of energy storage, offering significantly more autonomy than a standalone power station.
Strong AC output
With 3,840W continuous output, this set can handle much heavier appliances than compact portable power stations.
Scalable system
The B500K is part of a modular ecosystem and can be used to expand the total storage capacity of the system.
For backup and off-grid use
Ideal for users who want to be prepared for power outages or need long-lasting power in locations without a fixed grid connection.
Detailed explanation of the BLUETTI APEX 300 + B500K
The BLUETTI APEX 300 is designed as a powerful portable energy hub. Unlike smaller power stations, this system is not only intended for phones, laptops or lighting, but also for heavier loads such as power tools, kitchen appliances, refrigerators, pumps, mobile workstations and essential equipment during power outages.
The B500K expansion battery adds 5.12 kWh of extra storage. This does not only make the APEX 300 more flexible in practical use, but also greatly extends the available runtime. Where a standalone power station is often mainly suitable for short backup moments, this combo enables much longer operation.
Important to know: this set is primarily a modular power station system. For fixed home integration, use on dedicated electrical circuits or automatic backup integration in a distribution board, additional accessories, correct cabling and professional assessment may be required. Off Grid Supply can advise on the right setup based on your intended application.
How does this combo work?
The APEX 300 is the heart of the system. Appliances are connected to the available AC and DC outputs. The B500K acts as additional energy storage and connects to the APEX 300 through the dedicated battery connection. The APEX 300 then manages charging, discharging and energy flow to the connected devices.
When the battery is charged via mains power, solar panels or suitable accessories, energy is stored in the internal battery of the APEX 300 and the connected B500K. When appliances are in use, the APEX 300 provides the output power and intelligently uses the available battery capacity.
During a power outage, the UPS function can help keep connected essential devices powered with a fast switch to backup energy. For critical applications, it is important to determine in advance which appliances need to remain powered and how much runtime is required.
Suitable applications
The BLUETTI APEX 300 + B500K is especially suitable for situations where a large amount of energy is needed, but a fixed fuel generator is not preferred. The set is quiet, emission-free during use and flexible to deploy.
• Backup power for refrigerators, freezers, routers, lighting, laptops, pumps, medical peripheral equipment and small household appliances
• Campervan, caravan and motorhome use for extended off-grid stays
• Tiny homes, chalets, garden rooms or outdoor buildings without a stable grid connection
• Workshops or mobile job sites where electric tools are required
• Events, markets and temporary power supply
• Backup for home office or network equipment
• Combination with solar panels for renewable energy generation
• Off-grid projects where scalability is important
Who is the APEX 300 + B500K suitable for?
This combo is suitable for users looking for a serious yet flexible power solution. It is not a small power bank, but a powerful modular energy system for people who value longer runtime, high output and expandability.
• Households that want to keep essential appliances running during power outages
• Campervan and caravan owners who want to stay self-sufficient for several days
• Owners of tiny houses, chalets or off-grid locations
• Installers, tradespeople and entrepreneurs who need mobile power
• Users who want to expand later within the BLUETTI ecosystem
• People looking for a quieter alternative to a fuel generator
• Users who want to combine solar panels with portable energy storage
Key technical features
BLUETTI APEX 300
• Battery capacity: 2,764.8 Wh
• Battery type: LiFePO4
• Nominal battery voltage: 51.2V / 54Ah
• Continuous AC output: 3,840W
• Peak output: 7,680W
• AC output: 230V, 50/60Hz
• DC input: 2 × XT60PM-M
• Solar/DC input: up to 1,200W per port
• Standard AC charging: up to 2,300W
• UPS backup: 20 ms according to EU information
• Weight: approx. 38 kg
• Dimensions: 525 × 327 × 320 mm
• Charging temperature: 0°C to 40°C
• Discharging temperature: -20°C to 40°C
BLUETTI B500K
• Battery capacity: 5,120 Wh
• Battery type: LiFePO4
• Designed as an expansion battery
• Compatible with APEX 300 configuration
• Weight: approx. 45 kg
• Dimensions: 525 × 327 × 308.5 mm
• Charging temperature: 0°C to 40°C
• Discharging temperature: -20°C to 40°C
• Operating humidity: 5% to 95% RH
• Maximum charging current: 65A
• Maximum discharging current: 70A
• Expansion ports: 2 × 58.4V DC max., 90A max.
• Suitable for modular capacity expansion
Combo specifications
• Total capacity: 7,884.8 Wh
• Total capacity rounded: 7.88 kWh
• Continuous AC output: 3,840W
• Peak output: 7,680W
• Chemistry: LiFePO4
• Suitable for heavy-duty appliances
• Suitable for longer backup runtime
• Expandable within the BLUETTI ecosystem
• Can be combined with solar panels
• App functionality through the BLUETTI ecosystem
• Mobile use depending on weight and setup
• No fuel and no exhaust emissions during use
Compatibility and expandability
The strength of the APEX 300 series lies in its modular design. You can start with this combination of one APEX 300 and one B500K, and expand further later when your required runtime increases. This is particularly useful for emergency backup, off-grid systems or mobile energy storage for longer periods.
The B500K is designed as an expansion battery for, among others, the APEX 300. Within the wider BLUETTI ecosystem, accessories such as SolarX 4K, Hub D1, charging cables and trolley solutions are also available. Which accessories are required depends on the application: home backup, camper use, DC distribution, faster charging or solar expansion.
Please note: for fixed integration into a home electrical installation, a technical assessment is always required. A power station should not simply be connected as a fixed home battery to a distribution board without suitable equipment, protection and installation checks.
Charging with mains power and solar panels
The APEX 300 can be charged via mains power and also supports DC input through two XT60PM-M ports. This makes the system suitable for use with solar panels, provided the selected panels and cabling remain within the required specifications.
For larger solar setups, BLUETTI offers additional accessories such as SolarX 4K. This allows the APEX system to be used in more extensive configurations with higher solar input and more advanced off-grid applications.
For Off Grid Supply, this is important: we always recommend matching the charging setup to the intended use. A camper requires a different charging strategy than a home, workshop or tiny house.
Practical advantages in daily use
The BLUETTI APEX 300 + B500K is practical because it combines high output and large storage capacity in one modular system. In real-world use, this means you are far less likely to run into the limitations of a small power station.
• No petrol or diesel required during use
• Quieter than a traditional generator
• Suitable for indoor use when placed safely and in a dry environment
• Quick deployment during power outages
• Longer autonomy thanks to the B500K expansion battery
• Suitable for appliances with relatively high power demand
• Flexible placement for camper, workspace, home or outdoor building
• Expandable later with accessories and additional battery capacity
• Can be combined with solar energy for greater independence
Important difference compared to a fixed home battery
The APEX 300 + B500K is a powerful power station combo, but it is not a standard grid-connected home battery such as a hybrid inverter with fixed battery modules. That difference is important. A fixed home battery is integrated with solar panels, an inverter, smart meter, distribution board and optionally emergency backup circuits. A power station primarily works as a standalone energy source to which appliances are connected directly.
For emergency power, this is actually an advantage when you want a fast, flexible solution without a major installation. For automatic charging based on smart meter data, feed-in optimisation, fixed grid connection or peak shaving in the distribution board, a different system architecture is required.
Are you looking for a fixed home battery for solar panels, self-consumption, smart energy control or backup power for selected circuits? Off Grid Supply can also advise on hybrid home battery systems and fixed energy storage solutions.
What is included in the set?
The exact package contents may vary depending on batch or bundle configuration. Always check the current product contents when placing an order. Based on the typical BLUETTI configuration, this combo consists of the main unit and the expansion battery with the required basic connections for normal use.
• BLUETTI APEX 300 power station
• BLUETTI B500K expansion battery for APEX 300
• AC charging cable for the APEX 300
• User documentation
• Required battery connection, depending on bundle configuration
• Additional accessories only if explicitly included or selected
Why choose Off Grid Supply?
Off Grid Supply specialises in power stations, home batteries, backup power solutions, solar panels and off-grid energy systems. That means we do not only look at the product name, but mainly at the right application. A power station combo must match the power demand of your appliances, the desired backup runtime, the available charging options and the way you want to use the system.
• Advice based on actual energy demand
• Knowledge of BLUETTI power stations and expansion batteries
• Experience with backup power, off-grid and mobile energy solutions
• Support in choosing the right solar panel and charging setup
• Clear explanation of the difference between power stations and fixed home batteries
• Delivery from the Netherlands and support from a specialised supplier
Frequently asked questions about the BLUETTI APEX 300 + B500K
How much capacity does the BLUETTI APEX 300 + B500K have?
The APEX 300 has 2,764.8 Wh of internal battery capacity and the B500K adds 5,120 Wh. Together this equals 7,884.8 Wh, or 7.88 kWh.
Is this combo suitable as an emergency backup power supply?
Yes, the set is suitable as a backup for connected devices. Examples include a refrigerator, freezer, router, lighting, laptop, pump or other essential equipment. For fixed integration with home circuits, additional assessment and possibly extra equipment are required.
Can I connect solar panels?
Yes, the APEX 300 supports DC input through two XT60PM-M ports. The solar panels used must remain within the permitted voltage and current range. For larger solar setups, additional BLUETTI accessories may be required.
Is this the same as a plug-in home battery?
No. This is a powerful power station combo with an expansion battery. A plug-in home battery usually works with grid-connected AC control and sometimes smart meter control. The APEX 300 + B500K is mainly designed as a standalone power source and modular backup solution.
Can the B500K be expanded further later?
The B500K is part of the modular BLUETTI ecosystem. Depending on the chosen configuration, the storage capacity can be further expanded. Always check which expansion cables, ports and accessories are required for your intended setup.
Can I use heavy-duty appliances?
With 3,840W continuous output and 7,680W peak output, the APEX 300 is suitable for many heavier appliances compared to compact power stations. Always check the actual power demand and start-up current of the appliance you want to connect.
Is the APEX 300 waterproof?
No. The APEX 300 must be used in a dry and safe environment. Do not place the system in rain, wet areas or conditions where moisture can enter the connections.
Does Off Grid Supply provide advice on the right configuration?
Yes. Off Grid Supply can help determine whether this combo fits your appliances, desired backup runtime, charging options and any plans for solar panels or future expansion.
Ready for powerful and expandable backup power?
The BLUETTI APEX 300 + B500K is a strong choice for anyone looking for high output, long runtime and flexibility in one modular system. Use the set for emergency backup, off-grid energy, campervan use, work on location or as a reliable portable power supply.
Contact Off Grid Supply for advice on capacity, solar panels, accessories and the right configuration for your situation.
APEX+B500K
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BLUETTI APEX 300 + B500K combo with 3,840W output, 7.88 kWh LiFePO4 storage, UPS backup, solar charging and expandable BLUETTI ecosystem.