Q: The battery voltage is low, but the battery voltage is still not charged after more than ten hours of charging.

A:Judging from the phenomenon that the battery or charging circuit is faulty, you can check according to the following steps:
①Check whether the input and output voltage of the charging circuit is normal
② if the input of the charging circuits is normal and the output is faulty， pls disconnect the battery and test again,. If it is still abnormal, the charging circuit is faulty;
③if the output is normal after turning off the battery，It means that the battery has been damaged due to long-term uncharged, over-discharged, or has reached its lifespan.

Q: The UPS output is normal when there is mains power, but when there is an outage, the buzzer beeps for a long time.

A:Judging from the phenomenon that the battery or the inverter may be faulty, you can check according to the following steps:
①Check the battery voltage to see if the battery is undercharged. If the battery is undercharged, check whether the battery itself is faulty or the charging circuit is faulty.
②If the working voltage of the battery is normal, check whether the drive circuit of the inverter works normally. If the output of the drive circuit is normal, it means the inverter is damaged.

Q: When I turned on the UPS, there is no display on the panel, and the UPS does not work.
A:
1) Check whether the mains input fuse is burnt;
2) If the mains input fuse is in good condition, check whether the battery fuse is burnt because some UPS will turn off all the output and display of the UPS when the battery voltage cannot be checked by itself;
3) If the battery insurance is in good condition, check whether the main detection circuit works normally. If the mains detection circuit does not work properly and the UPS does not have the function of starting without mains, the UPS will also turn off all outputs and displays. ——If the city detection circuit works normally, then check whether the battery voltage detection circuit is normal.

If you are tired of testing it, call your IT team, or write an e-mail to the after-sales team of your UPS brand. Kstar UPS after-sales contact:service_datacenter@kstar.com.