1 7

BLUETTI

BLUETTI SolarX 4K | World’s First 4kW Solar Charge Controller

BLUETTI SolarX 4K | World’s First 4kW Solar Charge Controller

$699.00 USD
$599.00 USD $699.00 USD
Sale Sold out
Taxes included. Shipping calculated at checkout.
Buying Options

BLUETTI SolarX 4K | World’s First 4kW Solar Charge Controller

Compatibility: Apex 300, B300, B300K, B300S, AC300, AC500

  • Ultra-Fast Solar Charging: Delivers up to 4 kW of solar power, so your BLUETTI batteries charge faster and your devices stay powered longer, even off the grid.
  • Universal Solar Support : Supports solar panels from 150 V to 500 V, safely stepping down to below 60 V for effortless, worry-free charging.
  • Reliable & Safe Power: MPPT technology with isolation ensures steady performance, maximizes solar energy, and protects your devices.

SolarX 4K & PO9OD Adapter Cable  For Single Apex 300 Use

Specs

SolarX 4K Specs

 

INPUT

Max. Input Power4,200 W
Open-Circuit Voltage500 VDC
Startup Voltage150 VDC
MPPT Operating Voltage120 VDC to 450 VDC
Number of MPPT1
Rated Input Current13 A
Max. Input Current17 A

OUTPUT

Output Power4,000 W
Max. Output Voltage58 V
Min. Output Voltage35 V
Max. Output Current80 A
Communication InterfaceRJ45

GENERAL

MPPT Efficiency99% Max.
ConnectivityCAN 2.0/Bluetooth/Wi-Fi
Overtemperature Protection55°C (131°F)
Storage Temperature-20°C to 55°C (-4°F to 131°F)
Working Humidity10% to 90% RH
Protection GradeIP21
Noise52 dB
Weight7.6 kg (16.8 lbs)
Dimensions (L × W × H)288.4 × 474.0 × 90.2 mm (11.35 × 18.66 × 3.55 in)
Warranty2 Years

IN THE BOX

View full details

Seamless Solar Compatibility, Supercharged

Meet the world's first 4kW solar charge controller. The BLUETTI SolarX 4K takes 150–500V from nearly any rooftop or ground array and converts it into safe, sub-60V charging for BLUETTI power stations—up to 4,000W. That means faster charging, more stored energy, and reliable power whether you're backing up your home, running an off-grid cabin, or building your own solar farm.

Charge Your BLUETTI System, Your Way

SolarX 4K works seamlessly with a wide range of BLUETTI power stations and battery packs, from Apex 300 and AC300 to AC500, B300K, B300, and B300S. Whether you're charging one unit, several at once, or mixing stations with batteries, SolarX 4K delivers safe, efficient, and flexible solar charging tailored to your setup.

*For details, please refer to the FAQs.

Control Your Solar Power Anywhere, Anytime

Easily monitor your system in real-time, receive firmware updates, and troubleshoot instantly, all from the BLUETTI app, giving you complete control wherever you are.

Scalable Solar Power, 4 kW to 12 kW

SolarX 4K lets you decide how much solar power fits your life. Use one unit to cover daily essentials, or scale up to three for your whole home. It connects to your existing solar setup via AC coupling, keeping BLUETTI's DC input ports free for extra panels, so you get more energy, faster, without tying up your system.

Apex 300 + B300K + SolarX 4K

Charge to full in just 1.9 hours with 4,000 W of solar, fast enough to keep lights, small appliances, and everyday devices ready when needed.

Note: Data tested by BLUETTI Labs. Actual charging times may vary.

2 × Apex 300 + 4 × B300K + 2 × SolarX 4K

8,000 W solar delivers reliable energy for for larger appliances, power tools, and extended off-grid living.

3 × Apex 300 + 9 × B300K + 3 × SolarX 4K + AT

Scale to 12 kW, and with AT1*, reach up to 30 kW solar for heavy loads like central air conditioners, refrigerators, or a full home backup.

*Sold separately.

Operation Guide

BLUETTI SolarX 4K User Manual

BLUETTI SolarX 4K User Manual

FAQ

Q1: Any installation precautions for SolarX 4K?

Can I do it myself?Wear insulated gloves for safety. You can install it yourself if you have basic electrical knowledge. If you're unsure, it's best to let a professional handle the installation.

Q2: Is grounding required?

Yes, grounding is required for safe operation.The SolarX 4K has three grounding terminals (left, middle, and right):Right terminal: Mandatory grounding. Connect this to earth (usually to the ground bar of the home's electrical panel).Middle terminal: For input-side grounding. Use this if your solar panels require grounding.Left terminal: For battery charging. Connect to this if the battery has grounding requirements.

Q3: What's the terminal on the right side of the solar input used for?

It's for the ACFI (Arc Fault Circuit Interrupter) connection, designed to protect the system from arc faults by automatically disconnecting when a fault occurs.

Q4:Can glass solar panels connect to SolarX 4K?

Yes, provided the voltage and current are within SolarX 4K's limits.

Q5: Can different types of solar panels be mixed with SolarX 4K?

No. The SolarX 4K has only one MPPT input.

Q6: What kind of PV disconnect switch is needed?

Use a DC switch (PV isolator) rated for at least 600 V and 20 A. Make sure to use 2 positive and 2 negative wires (12–10 AWG, around 4–5 mm²) with MC4 connectors to match your solar panels.

Q7: Is there a minimum or start‑up PV voltage for SolarX 4K?

Yes, the starting voltage is 150V. Below that, the charging won't begin.

Q8: What BLUETTI models work with SolarX 4K?

The SolarX 4K works with these models:Power stations: Apex 300, AC300/AC500 (with expansion battery).Battery packs: B300K, B300, B300S, B4810, B1210, B1232.IMPORTANT: Ensure you use the correct connection cable for each unit.The AC300 requires an ARM version in the 4032 series, while the AC500 requires the 4044 series. For update details, please contact us at service@bluettipower.com with your product model, SN, and current ARM version.

Q9: Can SolarX 4K charge multiple Apex 300 units in parallel?

Yes. Use the XT60 DC output cable (sold separately).

Q10: What if there are two SolarX 4K units for two Apex 300s in parallel?

The setup is nearly the same. Install each SolarX 4K normally and then connect them.

Q11: How to update the ARM for AC300/AC500 to work with SolarX 4K?

Please check your current ARM version first. The AC300 requires an ARM version in the 4032 series, while the AC500 requires the 4044 series. For update details, please contact us at service@bluettipower.com with your product model, SN, and current ARM version.

Q12: Are other brands or lead-acid batteries supported?

No.

Q13: What is the maximum output of SolarX 4K?

4,000 W.

Q14: Why are there CA90 short cables and P090D/A long cables for connecting SolarX 4K?

Both connect the same way, but they support different power levels:CA90 short cable: Up to 4,000 W.P090D/A long cable: Up to 3,000 W-3,500 W. The difference is due to cable length—shorter cables have less power loss, so they deliver more power efficiently.

Q15: How much input power is available with Apex 300 + B300K?

Up to 4,000 W with the CA90 short cable, or 3,500 W with the long cable. Extra solar panels can be added directly to the Apex 300's DC input, achieving up to 6,400 W combined (4,000 W + 2,400 W).

Q16: Since SolarX 4K is designed for off-grid systems without grid connection, how does it handle excess power if the storage (like Apex 300) is fully charged?

When the Apex 300 is fully charged, it will send a request for 0 A current, preventing SolarX 4K from charging the unit further.

Q17: Can solar panels be connected if the total voltage exceeds 500 V?

No, the total voltage from the solar panels must not exceed 500V, as this can damage the unit. However, the current can exceed the 13A limit. For example, a 350 W solar panel with an open-circuit voltage of 43.8 V should be limited to a maximum of 12 panels in series.

Q18: When should I consider SolarX 4K?

Consider SolarX 4K if:You experience frequent outages without home battery system.You rely heavily on solar power.You need fast charging for off-grid cabins or RVs.SolarX 4K handles high-voltage solar input (150V–500V) and safely steps it down to a range (35V–58V) for efficient, high-power charging.

Q19: Can I connect other devices to the remaining XT60 ports on SolarX 4K if I use one or two Apex 300 units?

No.

Q20: Can SolarX 4K charge a system with mixed battery packs?

Yes, supported combinations include:Apex 300 with mixed battery packs (Apex 300 + B300/B300K/B300S)Battery pack mixes (B300 + B300K + B300S)AC300/AC500 with mixed battery packs (AC300 + B300/B300K, AC500 + B300/B300K)Note: Mixing different battery packs may result in uneven charge/discharge SOC (State of Charge).