Which one to choose? In the energiser game it is hard to compare apples with apples. But our number one tip is to look at output energy (joules).
Some manufacturers rate their energisers in output joules, while others rate theirs in stored joules. Output energy is the amount of energy that is delivered to the fence. Stored energy is the amount of energy stored inside the energizer (in the capacitors). Output energy (that is delivered to the fence) is usually about 30% less than the stored energy. Try to avoid comparing one brands output energy to another brands stored energy.
Some manufacturers may also indicate how many hectares/acres a particular energizer will power. Given there are so many variables involved such as configuration of the acreage, amount of cross fencing, number of strands, method of connections, plus interference to fencing by grass, woody weeds etc, it is safer to calculate your requirement by distance (allowing for multiple strands) of fencing rather than the paddock/property size.
So how many Joules do you need? Work on 1 joule per 5km of fencing. This is a very base guide but none the less a good starting point.In heavy load areas (ie lots of interference from vegetation) the 1 joule might only effectively power 1.5km.
Solar energisers give you the ultimate flexibility and the all in one units are simple to use - but they are generally only suitable for small areas.
Mains energisers will usually give you the most kick for your dollar but need to be located at a power source, and consequently there are ongoing costs to run.
Batteries can often be connected to mains energisers (and sometimes solar panels can too) but battery then has to be charged and terminal connections need to be checked regularly.
We have tried most brands and most styles (properly tried - on farm with livestock)- contact us and we will help you pick the best unit for your needs.
Finally it is always better to have more power than you need!