PowerSpout
React Pump Installation
© 2019 EcoInnovation Ltd (NZ) V2.1
Page 42
Array split into two halves facing East and West
3.1.2.
If the installation site is not shaded by hills, trees or
buildings from morning and evening sun and we want
to pump longer and have more power available
sooner it makes sense to have an array split into East
and West facing halves. The React pump would then
start pumping at about 6:30 AM and stop at 8:30 PM.
Pumping power at midday will not be affected, as with
the sun directly overhead the 1080W East/West array
will still be able to deliver the power needed for the
pump to be at full power capacity.
On an overcast summer's day the light is diffused by
the clouds. So on a cloudy day both arrays will
generate to a similar extent regardless of where the
sun actually is. We may never generate more than 300W from the 1080W array on a heavy
grey summers day in NZ, but all this 300W can be used, so the pumping yield does not
suffer as much as you might expect.
Winter sun is never directly overhead unless you are close to the equator. The angle of an
East/West array should be biased to morning, evening and winter sun. 45 degrees is a good
angle for and East/West array. Visualize a roof with a 45 degree pitch facing East and West
and you have it. The 4 x 270W panels are then very easy to mount onto a simple truss that
is described in more detail later. Such a truss can be mounted on 4 posts in the ground or on
a pontoon floating of your water resource.
In summary an East/West array pitched at 45 degrees will yield:
more pumped water on a sunny day
more pumped water on an overcast day
better all day and all year production if pitched at about 45 degrees
Sites with shading in the morning and/or evening
3.1.3.
Where the site does not benefit from early sun in the morning, and/or late sun in the evening
due to shading, the optimum arrangement will be to point the sub-arrays at the mid-morning
and mid-afternoon sun as shown here.
