I have a modest set of solar panels on an entirely ordinary house in suburban London. On average they generate about 3,800kWh per year. We also use about 3,800kWh of electricity each year. Obviously, we can't use all the power produced over summer and we need to buy power in winter. So here's my question: How big a battery would we need in order to be completely self-sufficient? Background …
Agreed this is the best option. Economy of scales and our consumers wishes should dictate the Grids plan to incorporate cheap energy ( and emergency) storages.
And, also like you said, change your energy life style and insulate your house wherever you can.
I’m very ignorant on this subject, but couldn’t you just sell excess to grid and get it back for a minimal markup? Seems like a good governmemt incentive to even supplement an even exchange program. Scaling things to everyone having their own giant batteries seems like a waste of the existing infrastructure.
(Author here) Yes, this is how it works in the UK. I sell my excess electricity back to the grid. The selling price is a bit smaller than the buying price.
I’m very ignorant on this subject, but couldn’t you just sell excess to grid and get it back for a minimal markup?
Sure, but it depends on the incentives in your country. Afaik, excess energy could be sold, but you’ll have to checkout your local incentives and energy suppliers for specifics. In most parts of Europe, the are scaling down the prices for excess energy. Therefore, battery systems are being forwarded in some cases as sort of solution for solar panels maintaining like ca. 80% +? integrity efficiency over 20 to 30 years.
For example, I read that in The Netherlands the solar panel market has crashed completely or is crashing. Note here that saturation of the market ( many existing solar panels) can also cause that.
You need to find out;
energy usage
insulation options and materials
costs /benefits
energy contracts and energy incentives.
check out current physical electricity wiring and fuses in the house
DIY or professional?
budget
etc
TLDR: dont buy solarpanels if you want to be rich. And buy them according and after you’ve done everything possible to insulate your house, whether in the colder or warmer climates. The efficiency, added value, and comfort reached by insulation outweighs everything else. Then , after doing that, check your kwh usage, and buy solars according to that.
Hope this is helpful, but seems you need to go outthere and do some exploration on the topic.
And buy them according and after you’ve done everything possible to insulate your house, whether in the colder or warmer climates.
In the USA there are silly rules that you can only get 120% capacity of your last years worth grid consumption as solar installed. So if one were to follow your advice and do all the energy efficient improvement prior to solar, then you would be restricted to getting a much smaller array. I understand why they have the rule, but its easy to circumvent by just having artificially oversized consumption for a year in your house, and you can then get the larger array you want before then doing all the energy improvements post-array installation.
It’s also important to check whether solar overcacity is worthwhile in the UsA. Her3 it is not( anymore).
I’ll say generally speaking in most places it isn’t, however, once you go solar, you may increase your electricity usage as you move away from carbon based energy. Before solar we had natural gas furnace heating and two gasoline cars. Now we have two EVs and a cold climate heat pump with zero natural gas and zero gasoline consumption. So I wanted the larger solar capacity to cover the increases in electricity we knew we’d have.
Its worked out pretty well. We have fairly large electricity bills ($400ish) in Jan and Feb, a small bill in March, and usually a tiny bill (under $10) in April. Then no bills for the rest of the year. Also keep in mind that is TOTAL energy costs, no gas or gasoline bought anymore.
Agreed this is the best option. Economy of scales and our consumers wishes should dictate the Grids plan to incorporate cheap energy ( and emergency) storages.
And, also like you said, change your energy life style and insulate your house wherever you can.
I’m very ignorant on this subject, but couldn’t you just sell excess to grid and get it back for a minimal markup? Seems like a good governmemt incentive to even supplement an even exchange program. Scaling things to everyone having their own giant batteries seems like a waste of the existing infrastructure.
(Author here) Yes, this is how it works in the UK. I sell my excess electricity back to the grid. The selling price is a bit smaller than the buying price.
Sure, but it depends on the incentives in your country. Afaik, excess energy could be sold, but you’ll have to checkout your local incentives and energy suppliers for specifics. In most parts of Europe, the are scaling down the prices for excess energy. Therefore, battery systems are being forwarded in some cases as sort of solution for solar panels maintaining like ca. 80% +? integrity efficiency over 20 to 30 years.
For example, I read that in The Netherlands the solar panel market has crashed completely or is crashing. Note here that saturation of the market ( many existing solar panels) can also cause that.
You need to find out;
TLDR: dont buy solarpanels if you want to be rich. And buy them according and after you’ve done everything possible to insulate your house, whether in the colder or warmer climates. The efficiency, added value, and comfort reached by insulation outweighs everything else. Then , after doing that, check your kwh usage, and buy solars according to that.
Hope this is helpful, but seems you need to go outthere and do some exploration on the topic.
(Ed: layout)
In the USA there are silly rules that you can only get 120% capacity of your last years worth grid consumption as solar installed. So if one were to follow your advice and do all the energy efficient improvement prior to solar, then you would be restricted to getting a much smaller array. I understand why they have the rule, but its easy to circumvent by just having artificially oversized consumption for a year in your house, and you can then get the larger array you want before then doing all the energy improvements post-array installation.
Yes , I can see how that impacts the process. indeed checking the rules and doing some prior info digging is essential.
It’s also important to check whether solar overcacity is worthwhile in the UsA. Her3 it is not( anymore).
I’ll say generally speaking in most places it isn’t, however, once you go solar, you may increase your electricity usage as you move away from carbon based energy. Before solar we had natural gas furnace heating and two gasoline cars. Now we have two EVs and a cold climate heat pump with zero natural gas and zero gasoline consumption. So I wanted the larger solar capacity to cover the increases in electricity we knew we’d have.
Its worked out pretty well. We have fairly large electricity bills ($400ish) in Jan and Feb, a small bill in March, and usually a tiny bill (under $10) in April. Then no bills for the rest of the year. Also keep in mind that is TOTAL energy costs, no gas or gasoline bought anymore.
nicely done.