User Guide

www.poweroptimal.com Document Version: 2.08
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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
TABLE 3. PERCENTAGE OF ANNUAL HOT WATER REQUIREMENT
The below example table indicates what % of the annual hot water requirement will on average be supplied by the system
for 2 people each using 80 litres of hot (60 °C) water per day. (The amount of water heated will vary with weather
conditions, by geographic location and by season. Water heated per day will be significantly lower in winter and
significantly higher in summer. These numbers indicate heating capacity – i.e. if no hot water is used on a given day, there
will be less water heated on that day. This is only an approximate guide.)
Solar + Elon®
Annual average % of hot water requirement supplied for 2 people each using 80 litres
of hot water per day for X kW
p
installed solar capacity
Location
kWh/kW
p
/yr
0.8 kW
p
1 kW
p
1.2 kW
p
1.4 kW
p
1.6 kW
p
1.8 kW
p
2 kW
p
2.5 kW
p
3 kW
p
3.5 kW
p
Bloemfontein
1894
50%
62%
75%
87%
99%
112%
124%
155%
187%
218%
Cape Town
1624
43%
53%
64%
75%
85%
96%
107%
133%
160%
187%
Durban
1447
38%
47%
57%
66%
76%
85%
95%
119%
142%
166%
Jhb/Pretoria
1724
45%
57%
68%
79%
91%
102%
113%
142%
170%
198%
Nelspruit
1627
43%
53%
64%
75%
85%
96%
107%
134%
160%
187%
Port Elizabeth
1565
41%
51%
62%
72%
82%
92%
103%
128%
154%
180%
Upington
1912
50%
63%
75%
88%
100%
113%
126%
157%
188%
220%
Saldanha
1623
43%
53%
64%
75%
85%
96%
107%
133%
160%
186%
Examples:
An array of 1.2 kW
p
will provide approximately 64% of the annual hot water requirement for a family of two people in
Cape Town.
An array of 2 kW
p
will provide approximately 124% x (2 people / 4 people) = 62% of the annual hot water requirement for
a family of four people in Bloemfontein.