SOLAR WATER HEATING – WHAT SIZE DO YOU NEED?

SOLAR WATER HEATING – WHAT SIZE DO YOU NEED?

An easy guideline is to do a quick evaluation of how much electricity is being used each day in heating water.

  1. Day 1, taking a reading of your electricity meter at a predetermined time (for example 9,00 in the morning)
  2. Day 2 read the meter again (same time) – and calculate the kWh units used in 24 hours.
  3. Day 3 read the meter again (same time) - and calculate the kWh units used in 24 hours.
  4. Day 4 - read the meter again (same time) – and calculate the kWh units
    1. Turn off the electrical geyser at the distribution board
  5. Day 5 - read the meter again (same time) – compare the kWh units used with geyser off for 24 hours against the average of the 3 days with geyser on.
    1. Turn the geyser back on at the distribution board.
  6. Repeat the exercise if necessary turning off the geyser for 24 hours

Example

Meter Reading kWh Units Used
Day 1 – Start 10000
Day 2 – Reading at 09,00 10023 23
Day 3 – Reading at 09,00 10047 24
Day 4 – Reading at 09,00 Turn off geyser 10073 26
Day 5 – Reading at 09,00 Turn on geyser again 10087 14
Average 1st 3 days 24
Geyser consumption 10
Solar geyser required – at least 8 -12 kWh Output

When buying a solar water heater, either a retrofit (where the existing tank is used) or a complete system, buy a solar system that tells you how much electricity in kWh you should save on an average day.

We recommend you ‘Get a Quote’ from Ubersolar and compare with others.