My decarbonized life, episode 2: a good electricity bill
In the image, my most recent electricity bill, for last May. The total amount, €37.77, is for a month with reasonably mild weather: with no need to use the heating or cooling, hot water consumption for up to four people, and charging an electric vehicle. To put this in context, I should point out that this is a fairly large house in the outskirts of Madrid (Spain) that, for the last few months, has had no gas supply at all: hot water and heating/cooling are provided by a heat pump.
This is the first bill that allows me to make a reasonable analysis of the decision we recently made to install a heat pump, seventeen Canadian Solar 450W solar panels, an inverter and a 10kWh Luna battery from Huawei. Total energy produced during the period was 1.24MWh; we consumed 768.89kWh, or 61.81%, and exported 475.09kWh, which makes up the remaining 38.19%. Our energy consumption was 788.61kWh, which represents self-sufficiency of 96.43%, and we imported from the grid 28.16kWh, the remaining 3.57%.
What was this imported energy used for, taking into account that, by…
