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Attention! Diesel generator battery maintenance of these few misconceptions users must avoid

June 22, 2022
Diesel generator starting battery as an important part of the starting system, can provide important energy support for diesel generator sets, its ability to work properly for diesel generator sets is vital, and other industrial equipment, the battery also needs regular maintenance, but many users in this area is not very experienced, and even for maintenance projects and maintenance methods there are some misunderstandings . Today's generator manufacturers - top Bo power to take you together to understand the battery maintenance in a few major misconceptions, I hope that the majority of users must try to avoid the wrong maintenance methods.
Myth one: "maintenance-free lead-acid batteries" do not need regular maintenance
The so-called "maintenance-free" is relative to the traditional open battery does not need to regularly add electrolyte or distilled water, rather than the need to regularly check its "health status".
If these maintenance-free batteries are not checked regularly, they are very susceptible to deterioration and failure. Lightly, the leakage of liquid corrosion, internal short circuit, serious will cause local fire, causing fire, to the user caused serious economic losses.
Myth 2: Maintenance battery only need to monitor the voltage can
Due to the cost factor, some engineers tend to use a multimeter to test the float voltage of the battery, and the current online system on the market also monitors and evaluates the health status of the backup or storage battery through the voltage of the battery. However, the float voltage can only reflect whether the charger is working properly, but not the health of the battery. When the battery capacity drops, the float voltage is likely to remain falsely high due to the control of the UPS charger. This is why in many cases the UPS voltage display is normal, but after a power outage the battery pack is quickly dropped and can not be discharged.
Myth 3: Measuring the internal resistance of the battery with a multimeter is enough
Can not use a multimeter to measure the internal resistance of the battery for three reasons:
1. method - as we all know, multimeter resistance measurement is based on Ohm's law, Ohm's law is only applicable to metal conductors. But the battery belongs to the chemical battery, its internal chemical reaction can not be calculated by Ohm's law, so the internal resistance value measured by the multimeter has no reference significance. At present, there are basically three methods to measure the internal resistance of the battery: AC injection measurement of internal resistance, AC discharge measurement of conductivity, DC internal resistance discharge method. It is recommended that engineers use professional instruments to test battery internal resistance accurately and reliably.
2. Accuracy - battery internal resistance size is generally at the milliohm level, but the resolution of ordinary multimeter resistance file is around 0.1Ω, and does not meet the testing accuracy requirements.
3. Safety - the resistance file of the multimeter does not allow the existence of voltage, but there is always voltage at both ends of the battery. Using a multimeter to test the internal resistance of the battery is easy to burn the multimeter.
Myth 4: Battery voltage is low, no need to pay attention to the safety level of the test equipment
According to the International Electrotechnical Commission standards, the battery test environment belongs to CATIII electricity environment. Since the UPS or DC screen is not completely isolated from the utility, transient high voltage shocks in the grid (due to lightning strikes or capacitor bank switching, etc.) may be transmitted to the battery side and cause personal injury to the tester. The concept of CAT rating is not alarming, as it is designed to ensure sufficient creepage distance between the exposed metal parts of the meter and the human hand in case of a transient high voltage shock to the test pen.