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Solar panels , would you ?

PJ87

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Depends on how risk averse you are.
Over the last year, the Tracker price in my area (South West) has been above the cap on about 6 days (back in Jan 23). Highest price was 32p on one day, other high prices were between 28 and 30p. For the other 355+ days of the year it's been under the cap, usually quite significantly.
(Come to think of it, the price cap back in Jan 23 might have been above 32p?)
So I reckon you need to be REALLY risk averse to avoid it.

But each to their own. You are clearly on the best tariff for your usage pattern, able to charge the battery and your car at 9p.

For now yes. If I can get on intelligent I'll be on 7.5p a kw which is by far the best

I've averaged this year 9.787p a Kw and from the grid have taken 6528kw

That's on a rolling year average
 

larmen

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Our total since November is 94kWH at price cap (about £27), plus £15 during saving sessions for shifting the load before and getting through it on close to 0 kW usage.

No export, didn’t even fill the battery (5kWh) completely once so far.

I need to work out if agile is good for us. Likely is, but I want to see our data 1sr before signing up. We peak at around 11kWh load for a day, but that’s 3 days a week when I charge 3 of them into the bike and we run washing. We bottoms out at about 5Kw on light days.


Looking at it, Agile currently is maxing out at 5p above government guarantee for 3 hours a day which we could bridge easily. Otherwise it seems much cheaper. Currently.
 
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Mudball

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Today we got our panels up... unfortunately they could not finish the electrics. So it the system is not rigged up yet.

I was hoping they would have made it work. I wanted to see what it would be like on the coldest, greyest and snow flurry day
 

larmen

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You didn’t miss much. We had 0.3 kWh for every kW on the roof. Yesterday we were at over 2 on our best day ever.
 

larmen

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Solcast. Not an app, a web page. Some Australian scientist runs it commercially, but free hobbyists accounts are available for domestic arrays.

I just use it to look at it, but the idea is that with an API you could calculate if tomorrows sun is enough or if you need to charge your batteries on cheap night time tariffs.



We moved to Flux now. Charging every night at 17p anyway, if we fill the battery again during the day with excess solar then we export at 18p. No need to get it dynamic under those conditions. If we are dry before 4pm I fill for an hour at 29p to get us over the peak (4 to 7 at 42p) without grid.


Today might be the 1st day we actually ‘make’ money. Depending on how we get through until midnight we might make up to 4p, but I have my bike battery on the charger and it might drain the house battery before end of day.
 

Mudball

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Solcast. Not an app, a web page. Some Australian scientist runs it commercially, but free hobbyists accounts are available for domestic arrays.

I just use it to look at it, but the idea is that with an API you could calculate if tomorrows sun is enough or if you need to charge your batteries on cheap night time tariffs.



We moved to Flux now. Charging every night at 17p anyway, if we fill the battery again during the day with excess solar then we export at 18p. No need to get it dynamic under those conditions. If we are dry before 4pm I fill for an hour at 29p to get us over the peak (4 to 7 at 42p) without grid.


Today might be the 1st day we actually ‘make’ money. Depending on how we get through until midnight we might make up to 4p, but I have my bike battery on the charger and it might drain the house battery before end of day.

Will look into it.... I have a slightly diff Q....

With our 16 panels, i am supposed to generate about 5.8k... we have a battery at 6.9k.. so there is fair bit of headroom. Given that we plan to move to tOpus Flex, which exports directly and then fills battery and car at offpeak. It probably means, that the my battery has nothing to do with the PV. So can i increase my battery to say 10k and then effetively do a bit of export arbitrage. It may pay off faster than i think it will. Just Thinking aloud
 

larmen

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I think you mix up kW and kWh? Your panels generate up to 5.8 kW every hour (inverter size limits this down) but your battery can store 6.8 kWh in total. Flow rate versus volume.

On Flux there isn’t much play between off-peak (17p), regular (29p, just like any other capped rate) and peak (42p), on 5 kW storage speculation is more trouble than value.
If there is another saving session I am quite happy to dump the lot at £2 or even £4.

PJ87 seems to be on top of payback, maybe he has an excel template to share?
 

larmen

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Bit if a cold one today. Plenty of solar but the battery is protecting itself and only takes 570 kW. Did the same last night.
Hopefully we get it full, or at least enough to take us to 7pm.
 

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PJ87

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Bit if a cold one today. Plenty of solar but the battery is protecting itself and only takes 570 kW. Did the same last night.
Hopefully we get it full, or at least enough to take us to 7pm.

These cold sunny days are great , yesterday 6kw I produced. Did run out on the battery early cuz I did a lot of washing yesterday

Today 4kw produced and it's only lunch. Again lots of washing (sheet day) but been out so the battery is at 75% will make the day today
 

Mudball

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Got our panels connected to the system and grid and all that... Cold but bright day. Been up and running for the past couple of hours and it has generated some green bars.
Let me see how it functions tomorrow when we have our first full day..

On another note.. i was planning to switch to Octopus Intelligence tariffs. But the installer fella said that it will be about 4-6 weeks before i get the handover pack along with the MCS certificate. So can change after that. Is that true?
 

PJ87

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Got our panels connected to the system and grid and all that... Cold but bright day. Been up and running for the past couple of hours and it has generated some green bars.
Let me see how it functions tomorrow when we have our first full day..

On another note.. i was planning to switch to Octopus Intelligence tariffs. But the installer fella said that it will be about 4-6 weeks before i get the handover pack along with the MCS certificate. So can change after that. Is that true?

You can switch to the incoming tariff whenever you want..outgoing tariff you need to wait for Mcs
 

Mudball

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This morning… we generated our first 1kwh off the roof!!! Very excited.

After all the kerfuffle of installing it, spending a lot, chasing cables thru the house, the EV drinking up about 40kwh in one night… the 1kw generated feels great.

Gives me the the same feeling of spending 15 mins in the gym burning the calories from the giant Christmas dinner
 

bobmac

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This morning… we generated our first 1kwh off the roof!!! Very excited.

After all the kerfuffle of installing it, spending a lot, chasing cables thru the house, the EV drinking up about 40kwh in one night… the 1kw generated feels great.

Gives me the the same feeling of spending 15 mins in the gym burning the calories from the giant Christmas dinner
Does your roof face south?
Mine faces east and west so not ideal although I've read they will still work
 

PJ87

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Does your roof face south?
Mine faces east and west so not ideal although I've read they will still work

They can work on any roof. Even a north facing roof. Just 20% less efficient

East and west with a split array so one side in morning and other side in afternoon would be very effective
 
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