Make sure the battery is in a well-ventilated area.
Disconnect the battery from any load.
Connect the tubular Deep Cycle lead acid battery to the inverter/UPS to the battery terminals.
Please check the inverter/UPS settings for tubular battery settings at the back of the Inverter/UPS selection switch. The recommended voltage for a tubular deep-cycle battery is 14.4 volts. The current setting should be no more than 10% of the battery’s capacity. For example, a 100Ah battery should be charged with a current of no more than ten amps. And 150 Ah Tubular battery should not be charged more than 15 Amps Charging Current.
Turn on the Inverter/UPS and allow it to charge the battery for 24 hours for the first charging, which is very important when the first time Inverter/UPS is installed.
After 24 hours, check the battery voltage. After 24 hours of charging, it should reach 13.5 to 13.6 Volts.
The Inverter/UPS should have four stages of minimum charging, described as the Bulk stage, Absorption stage, Float mode and Trickle charging stage, to maintain the battery life and proper backup time for a Tubular Lead Acid battery.https://suvastika.com/what-is-charging-rate-of-a-battery/
Once the battery is properly charged, then connect the Load to the Inverter/UPS.
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