Here are the steps to charge a Tubular lead Acid Deep Cycle battery in Inverter/UPS.https://en.wikipedia.org/wiki/Deep-cycle_battery
- 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.
- Low Battery Cutoff Feature to protect the battery from Deep Discharge is an important parameter to check in Inverter/UPS.https://suvastika.com/prevent-tubular-battery-failure-use-low-voltage-battery-cutoff/
Here are some tips for charging a tubular battery:
- Use at least a high-quality battery Inverter/UPS designed for tubular battery 4 stage Charging.
- Do not use a locally made Inverter/UPS, which can overcharge or undercharge the Tubular deep cycle lead Acid battery. Overcharging can damage the battery and shorten its lifespan.
- Check the battery water level regularly and add distilled water as needed.
- Store the Lithium deep cycle lead acid battery in a cool, dry place.
Here are some signs that a tubular battery is fully charged:
- The battery voltage will be at least 13.6 volts after completing the Float charge.
- The battery will not accept more current from the inverter/UPS charger.
- The battery will be warm to the touch.
If you are unsure if a tubular battery is fully charged, it is always best to err on caution and continue charging it for a few more hours. Overcharging a battery is much worse than undercharging it.