Daily pv production

graememk · 16-07-2021 11:51pm

Started off dull but was a great late morning and the rest of the day.

Will end up at about 51kwh, still not a record for me.

Interesting that the flat top that i was getting in June has gone, Id say its down to the much higher air temps, (in june the wind was cold, kept the panels cool)

slave1 · 17-07-2021 4:22am

I had a full sun day but not my best. Definitely down to hotter panels, it was baking in the midlands

DrPhilG · 17-07-2021 1:57pm

Finally had a good day yesterday, nearly 40kWh and only exported 8.

Today I'm away from home and it's going to be a different story. Exported 5kWh already.

remoteboy · 17-07-2021 2:43pm

Got the new car on Tuesday. Today is my first day having it at home and on charge from the panels. Very happy with this sight.

DrPhilG · 17-07-2021 6:03pm

https://boards.ie/discussion/comment/117623958#Comment_117623958

Well I won't be exporting that much after all. Bloody power cut since 4.

SD_DRACULA · 17-07-2021 8:16pm

Capture.JPG

Closest I got to the "perfect" curve, and 41kw for the day 😁

harderthanf · 17-07-2021 8:23pm

Just under 46KW today from a 6.8KW South (ish) array. First full day in use. I actually thought I'd hit a bit higher

DrPhilG · 17-07-2021 8:32pm

I would have fully expected to beat my record, damn near perfect weather all day.

But power was out from 4:15 to 8:15pm. Currently on 22.4kWh.

Turds at ESB. That's the 4th power cut this month.

irishchris · 17-07-2021 9:47pm

Screenshot_2021-07-17-21-45-51-745_com.goodwe.semsportal.jpg

Screenshot_2021-07-17-21-46-31-838_com.ginlong.home.jpg

45.8 here in the west but horrifically hot today or may have produced more. A lot unfortunately given away to Esb today so sooner the fit the better. Perfect curve on the west facing array and not bad from South facing

Screenshot_2021-07-17-21-45-51-745_com.goodwe.semsportal.jpg

Screenshot_2021-07-17-21-46-31-838_com.ginlong.home.jpg

garo · 17-07-2021 11:04pm

29.7kWh from a 4.8kW E/W array. Car was charged over the last couple of days - 35kWh put in. So today it was export to ESB day. Exported 18! The battery is still 56% full.

DrPhilG · 17-07-2021 11:21pm

My battery is currently at 66%. Should take me close to morning.

slave1 · 18-07-2021 9:04am

https://boards.ie/discussion/comment/117624118#Comment_117624118

Do you know you can hold your finger on the Zappi icon, you’ll then go to a priority screen where you can drag the Zappi icon ahead of the EDDI, this way the Zappi gets the PV first and therefore more because with that screenshot the Zappi is only getting surplus after both house and EDDI....perhaps you already know this...

slave1 · 18-07-2021 9:06am

I’m getting 40ish last few days but not records, just too goddam hot here in midlands

remoteboy · 18-07-2021 9:15am

https://boards.ie/discussion/comment/117626527#Comment_117626527

I did not know this. Thank you.

harderthanf · 18-07-2021 12:13pm

What device are people taking readings from? I notice my inverter says I hit 64.9KW yesterday but the Eddi says 49.0. Very strange

irishchris · 18-07-2021 12:27pm

https://boards.ie/discussion/comment/117627026#Comment_117627026

Have you a battery? As power to this would be consumed before reaching the eddi

harderthanf · 18-07-2021 12:59pm

No, didn't go for a battery.

slave1 · 18-07-2021 1:21pm

Inverter the bible, MyEnergi is based on CT clamps which are not as accurate

graememk · 18-07-2021 2:01pm

https://boards.ie/discussion/comment/117627252#Comment_117627252

But it shouldn't be 20kwh out!

I had a perfect curve y'day and only hit 55.4kwh (8kwp, 6kw inverter, low slope, ne/SW)

Screenshot_20210718-140847.png

slave1 · 18-07-2021 4:50pm

Wonder would your oversizing have anything to do with it? Doubt it but just putting it out there

graememk · 18-07-2021 5:17pm

https://boards.ie/discussion/comment/117628308#Comment_117628308

Nah, if anything I would have the top of the curve cut off like I had in the colder days in June. My CT's and inverter and storage inverter tallies with each other.

What does effect mine is it's slope and angle.. but for this time of the year it's almost optimal! - winter not so much

There shouldn't be a 20kwh difference in readings.

When the inverter says it's putting out 5kw is the myenerie hub matching it?

- also is there a bit of shadowing in the morning? You can see that passing at about 9am

harderthanf · 18-07-2021 8:42pm

Yeah, some trees shading until about 9 ish in the morning. I'm also wondering why I'm not seeing anything over 5.7KW over the last 2 days. I wonder if the angle could be an issue

graememk · 18-07-2021 9:02pm

https://boards.ie/discussion/comment/117629347#Comment_117629347

It's the heat!

Example : the longi 370w panels - under specific test 1000w/m², cell temp of 25c it produces 370w

Under Normal operating cell temperature (45c) - solar irradiance, 800w/m², ambient air 20c, wind at 1m/s it produces 276w

Thats about a 25% reduction in production.

Your seeing about a 15% reduction.

On a day with scattered cloud you'll see a big spike after a cloud passes (or after rain), as the panels are cold.

Also that's why you have to be careful when oversizing arrays, incase you get a really cold but sunny day, the voltage could rise above the limits of the inverter ( there's a formula buried somewhere for it)

Source:

https://static.solartricity.ie/wp-content/uploads/2020/10/Longi-360-Watt-Data-sheet.pdf

Bobeagleburger · 19-07-2021 7:01am

The heat has a big effect on panel output.

irishchris · 19-07-2021 11:53am

Been clearing 40+ here for last week but with the weeks promised weather I think I should easily be clearing 50+.

On a side note notice the posts here are dwindling since the boards update and really not liking it so can see me drifting more from here.

I see someone set up a new boards site **** so cheers to the poster here who let me know of it. They have renewables section there which is much better laid out so think I will be moving to that for the foreseeable

Zzippy · 19-07-2021 12:58pm

Not sure how to assess if our recently installed system is performing as expected. 6.25kWp, 6kW inverter SE aspect. In the dull weather we were getting ~18kWh/day, the last 3 days in full sun we've gotten ~35kWh/day. Looking at other posters' outputs here for similar sized systems it seems on the low side. Looking at output graphs, we never seem to get above 4.5kW production, and can have sudden drops to zero several times a day - is this voltage-related? Should it be happening? Grateful for any insights.