When you’re looking for a solar energiser for a large electric netting set up the same basic principles apply –
namely where do you live and what are your expectations?
To work out which solar energiser suits your requirements, we need to know when and for how long you
intend to use the energiser as well as how the electric fence fits into your overall flock protection plan. For
example, are you running the energiser 24/7/365 and is it the sole line of defence between your flock and
predation? Or is this just a weekend / hobby thing and the flock is securely locked away every single night?
A quick note on energiser capacity – energisers are measured in “Output Joules” (J). A 200m set requires
an energiser with a minimum of 1.2J, 300m around 2.0J etc. You can always put more power than you
need into an electric net but you cannot put less. Another way of looking at this would be to say – regardless
of where you live or what your expectations are, the power level you require remains the same, what
changes is the size of the battery and the solar cell.
Watch this video for an explanation of why Output Joules is the best way to compare energisers or else read on below.
1. Energiser options for 24/7/365 Operators in Southern Australia
The big issue here is that you will need sufficient solar cell wattage to charge the battery all year round –
especially during the winter months. For example, if you live in an area that gets about 4 hours of Sunshine
per day in June (primarily VIC and TAS) then you will need an absolute minimum of a 20W solar cell to get
a 1.5J energiser powering a 200m electric net through the winter (this would be a marginal case).
(Just a quick diversion here – a solar energiser which comes in one box and all the bits are molded into one
piece is called an “integrated” energiser. Bigger energisers where you purchase the battery separate from
the energiser separate from the solar cell is called a “custom build”)
So, since you will need a 20W solar cell to get through the winter you are immediately in the realms of
custom build sets as no integrated set comes with a 20W solar cell. The best value custom sets are made
by JVA, but if you want more features and options then Thunderbird on Nemtek provides options.
For the battery your best option is to purchase one from your local battery dealer. The bigger the battery
you purchase the longer it will last in poor weather conditions. I would recommend that a 100Ah battery
would be the minimum requirement.
2. Energiser options for 24/7/365 Operators in Northern Australia
If you live in an area that gets more than 6 hours of sunshine per day in June (roughly north of the line from
Coffs Harbour to Geraldton) then you can reduce either your solar cell or your battery but not both. You will
need the same size energiser however as you are still powering the same length net.
So the sensible thing here would be to reduce the size of the solar cell and keep the same size battery.
(Another aside – There are some big integrated sets that would do the job here (in terms of sufficient power
output) but the problem is that they do not come with big enough batteries. For example the Thunderbird
S185B puts out 1.8J but only has a 12W solar cell and a 14Ah battery. This means you would need a
minimum of 8 hours of daylight per day which is only available in the NT in winter).
3. Energiser options for Hobby Operators in Southern Australia
For the purposes of this article I am going to assume that a “Hobby Operator” only uses the net in the
warmer months of the year (say September through to April) or locks their flock indoors at night and turns
off the energiser.
The big advantage that “Hobby Operators” are going to have over the “24/7/365” crew is that the hobby
operator can turn off the energiser at night during the winter months which effectively doubles battery
capacity. Therefore some of the integrated solar energisers start to become an option.
You are still going to require an energiser with an output over 1.2J, which means we can look at integrated
sets such as the Thunderbird S185B or “semi-integrated” sets such as the Thunderbird S340 or Nemtek
Agrisolar 25. (Semi-integrated means the solar cell and the energiser are one unit but you need to provide
your own battery). The Thunderbird S340 has a 25W cell, the Nemtek Agrisolar 25 has a 20W cell and the
Thunderbird S185B has a 12W cell.
4. Energiser options for Hobby Operators in Northern Australia
By and large the same rules apply in Northern Australia for hobby operators. Having the ability to turn the
energiser off at night makes roughly halves the amount of battery or solar cell capacity required so the
integrated or semi-integrated kits become a real option although any energiser bigger than this will also do
quite nicely.
My recommendations.
What I am going to do here is try and make an educated guess and rank all energisers on the market that
fit in the 200m to 400m electric netting sizes. I will rank firstly by capacity, taking note of the solar cell and
battery capacities and then price. All prices are RRP – if you want a quote for a specific net / energiser
combination please contact us for standard pricing.
200m netting – minimum energiser requirement
★ JVA MB1.5 Solar. Puts out a charge of 1.5J which also puts it in the 200m of netting category. This
is a nice simple system with a 20W Solar cell but you will need to supply your own battery. Pair it
with a big battery and the 20W solar cell should be able to get a 200m electric net powered
throughout the year in all areas other than the South. The main downside is that it has no battery
condition lights or a display to indicate output levels.
★ Thunderbird S185B. Puts out a charge of 1.78J which is also capable of powering a 200m kit. This model is actually the largest solar energiser with an internal battery available at present. Therefore if you are looking for an easy-to-use energiser that requires no external wiring or separat battery then this is the model for you. Comes with a AC charger so you can recharge the internal battery from the mains if poor weather causes the battery to run low. This unit is therefore significantly more expensive but remember that it does include the battery. This model is often heavily discounted as part of a 200m kit.
Over 300m
★ JVA MB3 Solar. Comes with 3J of output and a 50W Solar cell. Like all JVA systems it comes with
a lot of grunt but no bells and whistles – so no battery indicators or programmable functions etc. The
50W solar cell is big so pair it with a big battery and you have a powerful system. Probably a good
idea to purchase a fence tester at the same time (+$79).
★ JVA MB4.5 Solar. Output of 4.5J and a 50W Solar cell. So a very powerful unit with a lot of
recharge capacity but no fancy bits. All else being equal unless you need the extra capacity you
would be better off with the JVA MB3 as all the extra capacity will do is drain your battery faster
(because the solar cells are the same). RRP $549 plus a battery
★ JVA MB8 Solar 8J of output is big enough for any netting set-up. The MB8 comes with a 100W
solar cell.
Notes.
1. Don’t just choose the biggest! An energiser with twice the output will also drain the battery twice as
fast. So if your fencing set up requires 1.5J in order to function, choosing an energiser with an
output of 2J to 4J might make sense but 8J is a bit silly.
2. Choose JVA products if you just want something simple and cost effective. There are no indicator
lights so you should purchase a fence tester at the same time.
3. Nemtek products are for people who want to set up the system to suit their needs. Fully
programmable with separate day / night operations, output levels and pulse rates. Multiple indicator
lights and the works.
4. Thunderbird is best if you just want to take it out of the box and not lug batteries around.