User Guide

www.poweroptimal.com Document Version: 2.08
[e-mail] Page: 2 of 10
Directors: RA Fearon, FS Moolman, JJ Theron, DM Weber (Non-Executive), IR Jandrell (Independent)
Company registration number: 2012/099947/07
PO Box 5, Kleinmond, 7195
SECTION A. EASY SELECTION GUIDE: WHAT SIZE HEATING ELEMENT SHOULD I USE?
To get the best performance from your Elon® solar PV water heater, it is important that the geyser element is a
good match for the size of your solar PV array. This table helps you match the size of the solar PV array with the
size of the geyser element.
Solar PV array size
(kW
p
)
Best matching
geyser element size
(kW)
2
nd
choice geyser
element size*
(kW)
Geyser (water tank) size
(litres)
1 – 1.2
4
3
100 - 200
1.2 – 1.6
3
4 or 2
100 - 200
1.6 – 2
2
3
150 – 300
2 – 4
(two parallel PV strings)
4
NA
200+
* Second-choice element size would reduce efficiency by 10 – 20%.
Maximum allowed solar PV array specifications at Standard Test Conditions (STC):
I
sc
< 20A V
oc
< 240V Power < 4 kW
p