BMS protection, not enough input, communication problems, or problems with setting parameters are the main reasons why energy storage can't be charged. It can be fixed by figuring out what's wrong with each component.
Power outages that happen suddenly in energy storage systems are generally caused by inverter overload, battery protection, problems with the grid, or the climate.
To keep permanent and portable energy storage systems stable, you need to pay attention to the temperature, load, and connection state.
With the right care and use, household energy storage may not only make life more comfortable, but it can also become a very reliable Household Power Supply Standby solution, giving homes secure, intelligent backup power support all the time.
Common problems and how to fix them
The energy storage battery can't be charged, and you can look into this from a few different angles, such the battery, inverter, photovoltaic input, BMS protection, and so on.
1. Not enough photovoltaic or grid input
If the lighting is too dim, the inverter can't see the AC power grid input, or the line contact is bad, the energy storage system can't start charging.
resolvent:
Check the photovoltaic panel for any dust or other things that might be blocking it.
Make sure the inverter shows "normal grid input."
Check to see whether the input circuit is loose or not making good contact.
2. Battery BMS enters protection mode
If the battery voltage is too high, too low, too hot, or there is a short circuit, the Battery Management System (BMS) will immediately go into a protective state to stop charging.
resolvent:
Make sure the battery isn't too cold (<0 ° C) or too hot (>45 ° C).
See if the battery is very low in power and causes undervoltage.
Restart the battery or the BMS through the app.
3. The battery is fully charged or set to a low charging power
Some home energy storage systems may limit how much they can charge (for example, to 95% SOC) to protect the battery's life. When that limit is reached, the system will cease charging. The user may have also lowered the charging power in the system settings.
resolvent:
Find out if the system's SOC upper limit has been set lower on purpose.
Set the charge parameters back to their defaults
Check to see whether there is trickle protection mode when the battery is almost full.
4. Inverter malfunction or communication abnormality
Protocols like CAN and RS485 need to be used so that the energy storage inverter and battery can talk to each other. You won't be able to charge if the connection is loose.
resolvent:
Make sure that the CAN/485 connection wire is not loose.
Check to see whether the inverter says there is a fault, like "BMS communication error."
If you need to, restart the inverter and the whole system.
5. Battery aging or abnormal individual cells
When the battery gets old or the voltage difference between cells is too big, the system will stop charging.
resolvent:
Check the balance of the battery cells
Use tools from the manufacturer to test the battery.
If the defect is not fixable, the battery cell or the whole battery pack must be replaced.
二,Analysis of the Reasons for Sudden Power Outage in Energy Storage Systems
When energy storage devices suddenly lose power, it usually means that the protection is not working right or the operating environment is not stable. This needs to be looked into from three angles: electrical, load, and battery.
1. Too much power going out from the inverter
When high-power appliances run at the same time and household gadgets like air conditioners and refrigerators turn on right away, it might cause inverter overload protection and a power loss.
Normal event:
Turn off right away when starting high-power tools
Alarm for "overload" on the inverter
resolvent:
Don't turn on a lot of high-power devices at the same time.
Boost the power of the inverter, for example, by going from 5kW to 8kW.
2. Battery running out or abrupt overcurrent protection
If the battery's internal resistance goes up when it is putting out a lot of power, it could cause BMS overcurrent protection to kick in and cut off power.
resolvent:
Check to see if SOC is not enough
Stay away from high-power instantaneous discharge
After restarting the machine, turn the power back on.
3. High or low temperatures make things protect themselves.
Batteries and inverters are quite sensitive to temperature, and if they are in a hot or humid region, they can easily go into temperature protection mode.
Idea:
It is best to install home energy storage inside or in regions with good air flow.
Stay away from places that are damp, frosty, or in direct sunlight.
This kind of thing happens more often when portable energy storage devices are put in the wrong places. Because of this, home energy storage needs to pay more attention to how to control the temperature.
4. An unusual way to connect to the grid or changes in the grid
The inverter will automatically disconnect to protect the system if the power grid's fluctuations go outside of what the inverter can handle.
Answer:
See if the grid voltage is too high or too low.
Make sure the inverter settings are set to "off grid mode" or "automatic switching."
5. The system's internal wiring is loose or old.
Power outages can also happen when wire terminals are loose or cables are old, and these problems need to be fixed on a regular basis.
三, What can be done to make energy storage systems more stable?
To keep the energy storage system stable and safe for long-term use in the home, it is best to:
Check the status of the battery cells and BMS inverters on a regular basis.
Change the system's temperature control and ventilation based on the time of year.
Don't let the full power output last too long.
Set up in a dry spot with the right temperature
Don't mix communication wires and battery packs; use only official accessories from the manufacturer.
