Instruction Manual

PowerOptimal Elon® 100 Installation Manual
Version date: 2022/05/23
Page 23 of 37
Version number: 2.20
© PowerOptimal (Pty) Ltd 2022. The content of this document is confidential and all rights to the intellectual
property and/or information contained herein remain vested in PowerOptimal, except if otherwise agreed in
writing.
TABLE C1. ANNUAL AVERAGE LITRES OF WATER HEATED PER DAY
The below example table indicates the average number of litres of water per day that the system will
heat from 15 to 60 °C over a year period for different solar array peak power ratings. (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 litres of water heated 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
80
99
119
139
159
179
199
249
298
348
Cape Town
1624
68
85
102
119
136
154
171
213
256
299
Durban
1447
61
76
91
106
122
137
152
190
228
266
Jhb/Pretoria
1724
72
91
109
127
145
163
181
226
272
317
Mbombela
1627
68
85
103
120
137
154
171
214
256
299
Port Elizabeth
1565
66
82
99
115
132
148
164
205
247
288
Upington
1912
80
100
121
141
161
181
201
251
301
352
Saldanha
1623
68
85
102
119
136
153
170
213
256
298
Example:
For a solar array of 1.2 kW
p
, an installation in Johannesburg would yield about 1724 kWh/kW
p
/yr, or
1724 x 1.2 kW
p
= 2069 kWh/yr. This would be sufficient to heat on average 109 litres of water per
day. For a family of 2 each using 80 litres of hot water per day, this would provide about 109 ÷ (80 x 2)
or 68% of the annual hot water requirement.