Q1: Does it support DC side over-allocation?

A: The light resources in different regions are different. For areas with limited solar irradiance, DC side over-allocation can guarantee the power generation needs of users. Bluesun inverter can support up to 1.3-1.5 times of DC side over-allocation and has stable overload output capacity.

Q2: The external cooling fan of the inverter does not rotate. Is this normal?

A: This is normal. The BLUESUN inverter adopts intelligent air cooling design. When the internal temperature of the inverter is not high, the cooling fan does not work. Only when the internal temperature of the inverter reaches the threshold, the cooling fan will rotate to promote heat dissipation.

Q3: The temperature on the back of the inverter is a bit high when it is working. Is this normal?

A: It is normal. The inverter dissipates heat through the heat sink on the back. Only when the heat dissipation is normal can the inverter operate normally. The ambient temperature for normal operation of the inverter is generally required to be within 60 degrees. If the ambient temperature is too high, the inverter will reduce the load. It is recommended to install the inverter in a cool and ventilated place to avoid exposure to the sun.

Q4: What to do if the power generation is insufficient

1. Check whether there are any obstructions around the photovoltaic panels (such as trees, buildings, etc.)

2. Check whether there are any foreign objects on the photovoltaic panels or dust accumulated for a long time without cleaning

3. If the above troubleshooting methods still cannot solve the problem, please contact our after-sales staff for processing

Q5: Will the inverter have radiation when installed indoors? Will it affect your health?

A: The inverter has been strictly tested and qualified. There is no radiation hazard and it will not affect your health.

Why the output power of solar system does not reach the ideal power

There are many factors that affect the output power of a photovoltaic power station, including the amount of solar radiation, the tilt angle of the solar cell module, dust and shadow obstruction, and the temperature characteristics of the module.

The system power is too low due to improper system configuration and installation. Common solutions include:

(1) Before installation, check whether the power of each solar panel is sufficient.

(2) Adjust the installation angle and orientation of the solar panel.

(3) Check the solar panels for shadows and dust.

(4) Check whether the voltage of the solar panels after series connection is within the voltage range. If the voltage is too low, the system efficiency will be reduced.

(5) Before installing multiple strings, check the open circuit voltage of each string. The difference should not exceed 5V. If the voltage is found to be wrong, check the wiring and connectors.

(6) It can be connected in batches during installation. When each group is connected, the power of each group is recorded. The power difference between strings does not exceed 2%.

(7) The ventilation in the installation place is not smooth, the heat of the inverter is not dissipated in time, or it is directly exposed to the sun, causing the inverter temperature to be too high.

(8) The inverter has dual MPPT connections, and the input power of each channel is only 50% of the total power. In principle, the design and installation power of each channel should be equal. If it is connected to only one MPPT terminal, the output power will be halved.

(9) Poor contact of cable joints, too long cables and too thin wire diameters will cause voltage loss and eventually power loss.

(10) The grid-connected AC switch capacity of the photovoltaic power station is too small and cannot meet the inverter output requirements.

Precautions for paralleling Bluesun off-grid inverters

1. The off-grid inverter can realize up to 6 parallel inverters, multiple parallel inverters can be realized to form a single-phase system, and 3 to 6 inverters can be paralleled to form a three-phase system.

2. For off-grid inverter parallel systems, all lithium batteries need to use bus copper bars or battery combiner boxes to connect all lithium batteries together in parallel.

3. When using low-voltage lithium batteries in parallel, in addition to connecting the power cables and communication cables, you also need to set the DIP switch of the lithium battery, set the address of the lithium battery, set the host to address 1, and set the address of the subsequent batteries in sequence.

4. Off-grid multiple parallel systems use busbars or combiner boxes. When placing orders, attention should be paid to adding power cables from the combiner box or busbar to the inverter.

5. The inverse control integrated machine can realize split-phase use of up to 6 machines. The split-phase system can output two voltages of 120V and 240V at the same time. This demand is mostly in the Americas, and there are two voltage appliances in the home.

The difference between hybrid solar system and off-grid systems:

1. Off-grid systems cannot sell electricity. In application scenarios where customers do not sell electricity, off-grid systems are preferred.

2. The protection levels are different: mixed network IP65, off-grid machine IP20

3. The battery voltage levels are different: the battery voltage of the off-grid system is mainly 24 or 48V, and there is no high-voltage system

4. Off-grid systems are cost-effective

Off-grid system application scenarios:

1. Regions mainly in the Middle East and Africa

2. No electricity is sold, mainly for self-use.

3. Areas with unstable or no power grid

4. It is necessary to flexibly use multiple parallel machines to realize single-phase parallel machine or three-phase parallel machine.

One of the advantages of high-frequency off-grid machines is that they output pure sine waves, and the power quality is better than modified sine waves.

Our company mainly provides the following products for reverse control integrated inverters:

① 3.5KW European version inverter: BSM-3500LV-24, BSM-3500LV-24-DA (cannot be paralleled)

② 5.5KW European version inverter: BSM-5500LV-48, BSM-5500LV-48-DA (can achieve parallel operation of up to 6 units)

③10.2KW European version inverter: BSM-10200LV-48 (cannot be paralleled)

④ 3KW US version inverter: BSM-3000USLV-48 (two units must be used to output split-phase voltage)

⑤ 10KW US version inverter: BSJ10KW-JP (cannot be paralleled)

⑥ 5KW American version inverter: Shuori SYP 5K-U (can parallel up to 6 machines)