7 ms·

> If it saves 10% per month on my bill (7 euro), this would earn itself back within 3 years. Where are you getting these figures from? Is it realistic to expec

• jillesvangurp 1y ago
  It's relative to my cited bill of about 70 euro, obviously. 7/30 ~= 22 cents. Or about half a kwh per day here in Germany. Per day. I think that should be feasible with a well positioned panel. You might do better on sunny days. But if you balance that against all the lesser days, I don't think it's a strange average. All back of the envelope of course. If you get six sun hours on your 800w setup, you get almost 5 kwh. That's sort of the upper range probably. Maybe on really well positioned panels you might get 10 sun hours in the summer months. Or 8 kwh. I think few people would get that. But an average 0.5kwh per day is fairly modest and adds up to about 7 euro per month. Probably too conservative but that was on purpose. I think the official figures project higher yields. Since setups are capped at 800w, the percentage depends on your monthly usage. Easier to work in absolute numbers. I think most people could shave between 7 and 20 euros per month off their bills depending on how much sun they manage to get on their panels.
  • runeks 1y ago
    Thank you for elaborating. But this assumes that you consume the power as it's produced, right? Otherwise you need a battery as well. I imagine, for example, that the power produced during weekdays while at work would go mostly unused.