When it comes to budgeting your electricity usage it was important for us when designing our solar panel system just how much electricity we are using, and what was the biggest electricity usage amount and how in the future can we change this. After several months of monitoring, we determined that the creation of hot water was our biggest user of electricity, our system was designed around a solar collector and a 180litre tank, heated by a 1500watt element when the temperature dropped below 50degrees. Our Solar Collector setup Obviously we were happy with our solar collector, during the day it would create hot water, and in the day and evening