Our latest home improvement project has finally come to life and our new solar panels are online. This has mostly been Mr’s project. Not because I’m opposed to solar energy, but because I have zero time for researching, calculating and shopping for it. It took about a year from start to finish, and I won’t bore you with all the small and big problems with banmks what waht have you not and present you our own small energy centre.
Here you have a screenshot of that shows the energy use and production of our “power plant”. The image has 4 circles representing the different components, the middle circle represents the ac/dc converter. The top left corner shows you the current energy production. We have a maximum of 7.1 kwh, what you see here is 717 W, light clouds. The top right corner is the current energy use in the house. The bottom right corner is our battery. It has a maximum of 7 kwh, but it always tries to stay at 25% full in case of emergencies. Bottom left ist the interaction with the power grid. The dots going to the middle show you how much energy is going which way. All in all we’re currently very fascinated by the app. I guess this will wear off in a few weeks, but currently I keep checking it constantly.
One of the niftier components of the whole thing is a little (expensive) gadget that allows us to keep producing energy when the grid is down. With a normal solar plant, when the grid is down, your solar gets shut off. That’s sensible because you cannot safely repair a power line while thousands of roofs keep sending voltage. In our case, should the energy company send the signal tu turn off, our unit becomes its own closed circuit. Since experts have already predicted power outages to become more common, that seems like a sensible investment.
As you can see, our goal is to produce as much of our own energy as possible and I must say, for February it’s been good so far. One thing is that we do need to change our habits and try to use the electricity when it’s being produced, because I basically lose 8ct on every kwh I have to sell to the energy company. Years ago, before batteries were affordable, solar mostly went into the power grid and people got guaranteed high prices, making it a good investment. Friends of ours needed a new roof and didn’t know how to pay for it when the roofer told them that putting up solar would pay for itself and the roof. Those subsidies had their own problems, as they mostly benefited home owners and were paid by renters, but they led to a thriving solar industry. then those subsidies were cut, 100k jobs in solar were lost, and people stopped putting up new solar panels. Because if I calculate the cost of the whole thing and divide it through the expected kwh that it will produce, a kwh costs me 15ct while I get 7. But if I have to buy a kwh, I pay around 30ct, so I save 15 by using one that I produce myself.
Paradoxically, this has led to me occasionally using more energy on purpose, like today. It was a fairly sunny day and we produced 11 kwh, not bad for a day in February, which is about our daily use as well, but of course we don’t produce it evenly spread, so when I came home this afternoon, I put on the dishwasher on the high energy short cycle that only takes an hour. Because then the sun was shining, the battery was full, and I was selling my energy cheap. But if I put it on the low energy long cycle, that would take 4 hours, meaning that I would have to rely on the battery for the later half of the cycle, draining it faster and making me buy energy tonight/tomorrow morning, which is a perfect example of something that is the perfectly logical and sensible decision for one person being a negative for society as a whole, but I’m not going to feel bad about it.