Battery storage

Energy One Ltd

By Mathy Mpassy Isinki

Off Grid Energy Solutions Business andTechnical Sales Professional

A battery bank supply electricity to theconnected load when sun is not available.

Lead-acid batteries constitution:separate 2-volt compartments,known as cells.

Battery anatomy:lead plateselectrolyte insulator, preventing short circuitsbetween the platesnegative postpositive post

Batteries used in most off-grid renewableenergy systems are deep-cycle; flooded orsealed lead-acid batteries.

Lead-acid batteries convert electricalenergy into chemical energy when theyare charged. When discharging chemicalenergy is converted back into electricity.

The thickness of the plates allowsmultiple deep discharges of a deep cyclebattery.

Unlike flooded batteries, sealed batteriesare filled withelectrolyte at the factory, charged, andthen permanently sealed.

Two types of sealed batteries areavailable:

absorbed glass mat (AGM) batteriesand;gel cell batteries.

Sealed batteries are also known as“maintenance-free” batteries:

because fluid levels never need to bechecked; and because the batteries never needto be filled with water.

Sealed batteries advantages over floodedlead-acid batteries:

charge fasterdo not release explosive gases,much more tolerant of lowtemperatures.

Flooded lead-acid advantage over sealedbatteries:

less more expensive;store more electricity;have longer lifespan and;can be rejuvenated (equalized).

Batteries are wired by installers toproduce a specific voltage and amp-hourstorage capacity.

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