Question 1

Q1: Any installation precautions for SolarX 4K? Can I do it myself?

Accepted Answer

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.

Question 2

Q2:  Is grounding required?

Accepted Answer

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.

Question 3

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

Accepted Answer

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.

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

Q6: What kind of PV disconnect switch is needed?

Accepted Answer

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.

Question 7

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

Accepted Answer

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

Question 8

Q8: What BLUETTI models work with SolarX 4K?

Accepted Answer

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.

Question 9

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

Accepted Answer

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

Question 10

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

Accepted Answer

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

Question 11

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

Accepted Answer

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.

Question 12

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

Accepted Answer

No.

Question 13

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

Accepted Answer

4,000 W.

Question 14

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

Accepted Answer

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.

Question 15

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

Accepted Answer

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).

Question 16

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?

Accepted Answer

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

Question 17

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

Accepted Answer

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.

Question 18

Q18: When should I consider SolarX 4K?

Accepted Answer

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.

Question 19

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

Accepted Answer

No.

Question 20

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

Accepted Answer

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).

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

Seamless Solar Compatibility, Supercharged

Scalable Solar Power, 4 kW to 12 kW

Charge Your BLUETTI System, Your Way

Control Your Solar Power Anywhere, Anytime

Tech Specs

IN THE BOX