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How do I know if I need to replace my battery on my electric fence?

By April 19, 2022 No Comments

EFI uses Nemtek’s rage of electric fence energisers exclusively.
These energisers will display a service indicator light or a spanner icon to indicate low battery condition. This means that you now need to replace the battery

When your electric fence energiser detects low battery condition during a power failure, just before the energiser dies , the alarm will sound in an effort to warn the user that the energiser can no longer carry the electric fence systems load requirements and will soon shut off. Because this occurrence only happens so infrequently, this is the ideal time to call your electric fence installer to not only replace the battery , but also to do a maintenance inspection or electric fencing service . This includes checking and tensioning all electric fencing lines , resealing of connections and testing the entire electric fence system. Our Installers will usually simulate an intrusion for the client by tampering with the fence lines and tripping the alarm in front of the user/ home owner. This leaves the client reassured that their electric fencing system is working optimally when our team leaves the site.

Your electric fence energiser comes equipped with a back up battery to protect you during the odd power failure . Under normal circumstances in Cape Town,  this is a rare occurrence.  The back up battery should carry the energiser for at least 8 to 15  hours until power is restored.

Loadshedding and back up batteries.

The problem we are experiencing  nationally at present is the implementation of load shedding and its consistency of rolling black outs and its effect on the standard lead acid battery which comes as standard in most home security alarm systems and  automated access control devices such as sliding gate motors , garage door motors and electric fence energisers.
These motors and appliances rely on lead acid batteries as back up during power failure and under normal circumstances,  they perform well.

The advantage of lead acid batteries are that they are ussaully cost effective given their life span under normal circumstances ( infrequent power failure) and they are deemed fit for their purpose. They are tolerant to over charging and are readily available.

The disadvantage of lead acid batteries is that they take longer to charge and are not tolerant to deep discharge and given that that load shedding in South Africa happens so frequently ( power failure 2 to 3 times a day  for 2 to 3 hours for weeks ) , the batteries discharge deeply and do not have a chance to recover or recharge to optimal levels until the next bout of loadshedding starts. This results in a deeply discharged state and negatively affects the energiser battery’s life span.

Your electric fence energiser’s battery should be replaced every 1 to 2 years under normal circumstances.
According  to leading electric fencing supplier and distributor,  Nemtek , with loadshedding , it is now their recommendation that the batteries be replaced every 8 to 12 months or that the electric fence energiser be switched off during loadshedding bouts which occur during the day when home owners are at home  and when the risk of intrusion is at its lowest.

Most battery manufacturers guarantee their product with a minimum lifespan of 12 months, however,  given that loadshedding is an extra ordinary circumstance, these guarantees become void as they apply to ordinary use .

EFI recommends a routine maintenance call out every 12 months to check the electric fence system and back up battery to make sure you system is operating optimally