Ot… grid tie solar 8 gases


I had to get it installed to qualify for the grants system over here. If i did not work from home, it would easily cover our electrical needs for the summer 6 months or so of the year, but over winter generates little. Typical year i generate about 1700Kwh but only about 300kwh is between say October and march. hence winter heating bills really sting then summer time the bill is next to nothing.

Depending on your supplier pricing and what kinda deals you can get really depends on how well – soon it will pay for its self. Mines averaged a good 12%+ return year on year and the scheme mine was installed under raises with inflation and i have 18 years or so more payments to go. Really glad i did it, would recommend it but you need to crunch your own numbers.

Various people have various views on the pannels, my roof has concrete tile on it, its a generic 1986 house so its not exactly pretty to start with, on the plus side its converted useless south faceing roof space into something that’s of real net benefit to me.

Panels and the inverter tech is constantly evolving, panels are getting more efficient and the inverter tech is really marching on, i have toyed with converting mine over to the solar edge system, will probably do so in the next few years as i get partial shading over the winter months and i think it could really help bump my generation.

Other thing im very much toying with and that’s setting aside the final few years of payments and replaceing my system with the latest and greatest at that point, by then if things continue as they have i should be able to nearly double my generation on my limited roof space. Modules are now a good 15% or so more efficient than i have, hence a upgrade would hopefully see me with cheap low cost power if i remain here and i can’t really move.

Since 1978, PURPA ( US federal regulation) mandates that consumers can grid tie and back feed the line. Period. No ifs, ands, or buts. But, states get to set the rates and conditions. So, surprise, surprise, rates and conditions all vary, state by state.

As you say, in some places power companies have been required to buy back power at retail cost. It’s depends on the state. But that can also be good for power companies. The monthly service charge covers overhead- lines and poles, etc, and if the utility’s demand is highest during the day during the summer (most utilities in the states have this load profile) solar lowers their peak power demand. Since utilities pay much more than retail for peak power (since it’s temporary and has to come on and off line fast and sit idle the rest of the time) PV intertie actually cuts their power costs. It’s not intuitive, but the numbers work.

Same reasoning/economics as Demand Side Management. (DSM). Energy demand management – WikipediaIt’s now standard utility practice that, among other things, lowers peak loads by investing in new equipment for the customer. The utility pays for equipment for the customer that lowers the utility’s power sales. Sounds crazy, but it’s the same math. When DSM was first proposed, utilities ridiculed it until they were shown that it works and that there are other benefits to the utilities. Same thing with solar.