Understanding an Inverter | How to choose an Inverter | Features of a Microtek Inverter | Battery Information |
Installing & Wiring
| Do's & Don'ts of connecting an Inverter |
Glossary of Terms

Battery Information


The charger in MICROTEK Inverter is of Multi-Stages. The charging is divided into various modes depending on the voltage of the battery.

Life Saving Charge

This charging stage applies only, if for some reason, your battery has gone under deep discharge conditions. In this mode (until battery reaches to a minimum specified charge level) the charging currents is very low to avoid any excessive heat produced inside the battery. It is kept very low because the battery internal resistance is very, very high and using a high charging current may cause a rapid rise in the internal battery temperature which would shorten its life. This technique or method of using low charging current will not reduce your battery life cycle if your battery has gone under deep discharge condition.

Bulk Charge
In Bulk charging stage, the Microtek unit charges the batteries at the full charging current. i.e. 12 AMPS, so that this charging takes place at the fastest possible speed

Absorption Charge

The second stage of charging is Absorption. When the battery is 80% charged the Microtek unit will start reducing the charging current of the batteries in the steady fashion. As the battery is being charged to 100%, charging is reduced to negligible current.

Float / Trickle Charging Mode

After batteries reach full charge, charging voltage is reduced to a lower level to reduce gassing (boiling of electrolyte) and prolong battery life. This is often referred to as maintenance charge, as it does not charge the battery but keeps an already-charged battery from self-discharging.


Your batteries may attract dust, dirt and grime over time. Keeping them clean will avoid problems associated with grime. In the event of grime:

  • Check that all vent caps are tightly in place.
  • Clean the battery top with a cloth or a brush and a solution of baking soda and water.
  • When cleaning do not allow any cleaning solution, or other foreign matter to enter it.
  • Rinse with water and dry with a clean cloth.
  • Clean battery terminals and the inside of clamps using sandpaper. (Clean terminals will have a bright metallic shine).
  • Reconnect clamps to the terminals and thinly coat them with petroleum jelly (Vaseline)
  • This prevents corrosion.
  • Keep the area around batteries clean and dry.

Battery Ratings and Their Meanings

The most common battery rating is the AMP-HOUR RATING. This is a unit of measurement for battery capacity, obtained by multiplying a current flow in amperes by the time in hours of discharge.

Example: A battery which delivers 5 amperes for 20 hours is said to be of 100 ampere-hours or 100AH.

Battery Connections

Series Connection

In the Series Connection, batteries of like voltages and Amp-Hour capacity are connected o increase the voltage of the banks. The positive terminal of the first battery is connected to the negative terminal of the second battery and so on, until the desired voltage reached. The final voltage is the sum of all battery voltages added together while the final AMP-HOURS remains unchanged. The bank’s Voltage increases while its AMP-HOURS remains.

Parallel Connection

In the Parallel connection, batteries of like voltages and capacities are connected to increase the capacity of the bank. Positive terminals of all batteries are connected together and all negative terminals are connected in the same manner. Final voltage remains unchanged while the capacity of the bank is the sum of the capacities of the individual batteries of this connection.

Common Power Problems

There are various common power problems that UPS units are used to correct. They are as follows (with a typical example of damage that might be caused):

  1. Power failure — Total loss of utility power: Causes electrical equipment to stop working.
  2. Voltage sag — Transient (short term) under-voltage: Causes flickering of lights.
  3. Voltage spike — Transient (short term) over-voltage i.e. spike or peak: Causes wear or acute damage to electronic equipment.
  4. Under-voltage (brownout) — Low line voltage for an extended period of time: Causes overheating in motors.
  5. Over-voltage — Increased voltage for an extended period of time: Causes light bulbs to fail.
  6. Line noise — Distortions superimposed on the power waveform: Causes electro magnetic interference.
  7. Frequency variation — Deviation from the nominal frequency (50 or 60 Hz): Causes motors to increase or decrease speed and line-driven clocks and timing devices to gain or lose time.
  8. Switching transient — Instantaneous undervoltage (notch) in the range of nanoseconds: May cause erratic behavior in some equipment, memory loss, data error, data loss and component stress.
  9. Harmonic distortion — Multiples of power frequency superimposed on the power waveform: Causes excess heating in wiring and fuses.
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