I've been digging into solar power and while I'm sold on the idea of solar PV panels being a long-term energy solution, I'm quite concerned about how to store that energy effectively. With electricity prices fluctuating wildly in Europe, particularly with negative pricing, it makes me think that solar might take longer to pay off than anticipated. I'm looking for ways to maximize my energy production and storage without breaking the bank.
I've considered a few options:
1. **Thermal panels with a buffer tank**: They work well but often produce energy when you don't need it, leading to summer waste.
2. **Solar PV panels with batteries**: They seem effective, especially for electric vehicles, but the costs are hefty and batteries don't last long. If a 10kWh system only saves about €1.50 a day, the years of savings don't seem worth it.
3. **Geothermal systems**: They lower winter heating costs but require significant investment, and the ROI isn't as promising.
4. **Combining solar PV panels with a large buffer tank**: This excites me since it may offer a better ROI with thermal energy for heating needs, but it's bulky and can't power electrical appliances directly.
I'm open to suggestions or experiences from anyone who has found effective solutions to increase ROI for solar investments!
3 Answers
Regarding your battery calculations, you might want to consider the load-shifting potential by charging during low-price periods. Also, keep an eye on the market; battery prices are dropping, and new technologies like sodium batteries are on the horizon, which could help reduce costs significantly in the near future.
You're spot on; the ROI on solar can look daunting, especially if you're retrofitting. I installed a bunch of panels during my roofing project, and it saved me a good amount. Batteries can be expensive and, honestly, I see them more for backup than savings. For your thermal storage idea, using a solar diverter sounds like a smart way to optimize that energy, especially in the summer.
Have you thought about a Vanadium Flow Battery? They're known for their high capacity and low cost per kWh, plus they have a long lifespan of about 20-25 years. It's a solid option for storing electricity because it works differently from thermal storage and could meet your needs well.