AGK Electrics 2

AGK Electrics 2

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  • Created by: Gul
  • Created on: 03-06-09 10:49

Batteries

  • Converts chemical energy to DC electrical energy
  • Used in case of generator failure
  • Voltage of lead acid battery fully charged is 2.2 V
  • Capacity of a battery is the amount of amps that a fully charged battery can supply.
  • Test to assess state of charge by comparing on load and off load battery volts.
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Lead-Acid Batteries

  • Made of lead peroxide & lead
  • Electrolyte 30% sulphuric acid & 70% distilled water
  • Can be charged using generator/alternator (source with a higher EMF)
  • In storage, can be held on 'trickle' charge
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NiCad Batteries

+Lighter & more robust

+Sturdiness owing to it's metal casing

+Good storage capability + longer life

+Wider permissable temp range

- More expensive

- Lower voltage per cell

- Prone to thermal runaway

  • +ve plates nickel hydroxide -ve plates cadmium hydroxide
  • Electrolyte 70% distilled water 30% potassium hydroxide
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Thermal Runaway

Overcharging problem caausing electrolyte to boil, violent gassing, meltdown of plates and possible explosion.

Avoided by

  • keeping charge rates within limits
  • monitoring battery temp
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