Daily pv production

Jonathan

https://www.boards.ie/discussion/comment/118357614#Comment_118357614

No optimisers. No shading issues here even at this time even year when sun is low in the sky.

The sky in your photo is very blue looking! Never lifted here at all. Dull and grey in every direction. Will take a photo tomorrow for reference. Wonder are Dublin Mountains providing you a microclimate?

Forecast here looking a bit better for Thursday. About time.

bullit_dodger

https://www.boards.ie/discussion/comment/118357721#Comment_118357721

Microclimate - possibly. But that aside, I was producing ~200 watts from 10:30am -> 1pm. Isolating out this period of 2.5 hrs x 200 watts = 0.5Kwhr, which is still 5x times more than your entire day. For that period it was completely overcast and dark. No sun could be seen through the clouds. It did clear up about lunchtime as mentioned and then I took the photo linked. I'm working from home all day tomorrow. Happily take a few snaps out the window at at few different times and we can compare notes.

Don't know how much effort you want to spend on it - but plugging your details into

https://re.jrc.ec.europa.eu/pvg_tools/en/#PVP%20that's%20the%20calculator%20for%20Europe,

your forecast for Dec is 148Kwhr, considering your 2/3rd of the way through the month, how are you looking at reaching that target? Might be that your panels aren't optimized for diffuse lighting.

ELCAT2009

Thankfully back up to a 0.7kw reading from yesterday's low of 0.1kw! My highest this month was 7.9kw on 5th Dec. I think cloud thickness and low level yesterday was the main reason for such a low reading

THE ALM

Like Jonathan we had a shocker on Monday, 0.3kWh generated. Yesterday was a bit better but not by much and today is shaping up to be like Monday, nothing generated as of yet.

jethrothe2nd

I had 10 x 380w panels, a solis inverter and an Eddi installed a few weeks ago. I am using Solarman to monitor generation and myenergi to monitor usage - I have a CT clamp so that I can see generation on myenergi as well, but it is not installed yet.

I have just started properly tracking everything and I would appreciate some help to make sure I am reading these numbers correctly as from the myenergi app it looks like everything the house is using is pulling from the grid. So, for example, on the 14th Dec,

Generated: 5.3 (source: Solarman)

Exported: 1.4 (source: myenergi)

House usage: 6 (source: house icon on myenergi)

Grid usage: 6.1 (source: pylon icon on myenergi)

Eddi: 1.4 (source: tank icon on myenergi)

This is the same story for every day in that the house usage is = to grid.

championc

https://www.boards.ie/discussion/comment/118361576#Comment_118361576

Just post a screen pic from when it's generating and maybe when not

THE ALM

sunshine at last, hallelujah

Jonathan

https://www.boards.ie/discussion/comment/118365109#Comment_118365109

Did you charge the EV last night or are you running a grow house? 😂

THE ALM

https://www.boards.ie/discussion/comment/118365289#Comment_118365289

🤣🤣🤣 long journey ahead today so EV charged, harvesting was done so can power down the grow house😂

slave1

Wish I could get away with 33kW, I'm well North of 80kW the whole time between high battery EV's, storage heater and hot water demands

Jonathan

https://www.boards.ie/discussion/comment/118365338#Comment_118365338

You are pulling 80kWh each night?!? Are you on a 16kVA supply?

THE ALM

https://www.boards.ie/discussion/comment/118365338#Comment_118365338

car was over half charged so could have been double that, 77kWh battery plus other loads could have us a 80+ also, thankfully wouldn't be charging the car that much every week, 80+ would be an exception.

slave1

https://www.boards.ie/discussion/comment/118365442#Comment_118365442

Standard 60amp feed will take 10kW no problem, that's car+hot water+storage heater for 8 hours at night rate and whatever else used throughout the day

Jonathan

https://www.boards.ie/discussion/comment/118365729#Comment_118365729

I know that, but take a bit more work to balance the various loads, particularly if you don't have a EVSE with a CT clamp. Easier having a bit more headroom.

Having said all that, I just looked back at my stats and I pulled 46kWh yesterday. 😂

slave1

My EV is load balanced as I have electric shower, long term EV owner and no escaping high night rate due to my dependancy on electricity, which I have no problem with and will be moving to 12kWp next year

jethrothe2nd

https://www.boards.ie/discussion/comment/118362722#Comment_118362722

Screenshot_20211223-140647_myenergi.jpg

Screenshot_20211223-140700_myenergi.jpg

Screenshot_20211223-140735_solarman.jpg

This is from today. Generated 2.5kWh, pulled 4.4kWh yet house consumption is 4.2kWh. Exported 0.8kWh.

yankinlk

https://www.boards.ie/discussion/comment/118366275#Comment_118366275

https://www.boards.ie/discussion/comment/118366275#Comment_118366275

https://www.boards.ie/discussion/comment/118361576#Comment_118361576

I think from your setup, you have no battery correct? So in that case the only way you will consume the solar generated power is when the suns output matches or exceeds the house needs. The house draw will be variable at times... say a kettle for example... and the sun too is very variable and in winter not very powerful. Its rarely going to match up so most draw will be grid.

The battery would help "fill the gap" and anything the house needs that exceeds the actual solar generation that moment... Will help, but only to a limit that the battery can output. So a kettle for example needs a lot of power for a short burst you may still need some grid to fill that need.

THE ALM

Much better yesterday, hopefully continues until the end of the month.

handpref

A massive 1.8kwh yesterday, best day of December was 2.2kwh.

5.4 kwp East West

Bif

Here’s mine for yesterday. Great in the morning but …

jethrothe2nd

https://www.boards.ie/discussion/comment/118368469#Comment_118368469

Correct, no battery. On that particular day, if I generated 5.3, of which I exported 1.4 and 1.4 went to the Eddi, that says to me that the house consumed the remaining 2.5kWh. I would have expected from that the grid usage would be around 2.5 less than house usage, unless I am fundamentally misunderstanding something.

bullit_dodger

https://www.boards.ie/discussion/comment/118369488#Comment_118369488

I think the logic that you outline above is on the money jethro, however I'm not really seeing a question here? Some of the charts that you posted were at 15:30 so you obviously had more consumption that day which wasn't recorded (at the time).

As far as I can tell things look like workthing good for you.

jethrothe2nd

https://www.boards.ie/discussion/comment/118369599#Comment_118369599

Yes, sorry I confused the issue by posting charts for yesterday rather than the example that I gave.

Just using the numbers I gave from the original example and not the charts, what I am trying to understand is why myenergi says that grid usage (6.1kwh) and house usage (6kwh) are the same. I would have expected grid usage to show 3.5kwh.

5.3 (generated) - 1.4 (exported) - 1.4(eddi) = 2.5 used by the house

It's the same for every day - grid usage on myenergi does not reflect what solar generated and was used by the house

bullit_dodger

Thanks that helps, but unfortunately I'm not totally seeing it. However, what may help explain is that the Eddi usage is often considered "part of the house usage", so your double substracting the eddi there.

To use your own figures, you have...

Generated: 5.3 (source: Solarman)

Exported: 1.4 (source: myenergi)

House usage: 6 (source: house icon on myenergi)

Grid usage: 6.1 (source: pylon icon on myenergi)

Eddi: 1.4 (source: tank icon on myenergi)

Or to put it another way, that

House usage: 6 (source: house icon on myenergi)

includes

Eddi: 1.4 (source: tank icon on myenergi)

if you follow me.

I would expect

House usage = (Generated - exported) + Grid usage.

House usage = (5.3 - 1.4) + 6.1

House usage = 10 Kwhr

I suspect you have a clamp wrong somewhere - but very difficult (impossible) to tell remotely. Possibly the "grid CT clamp" might be located incorrectly - but I'm guessing.

Jonathan

Happy Christmas everyone.

Santa brought me a new production record; 0.0 kWh 🎅

Thermal didn't do any better. Barely managed to raise the collector 2°C!

graememk

Ha yep 0.8kwh here..

And between charging the car and the ovens.. 65kwh in the last 24 hrs

bullit_dodger

Likewise a very happy Christmas to all the renewable proponents here! No car but averaging 45 Kwhr / day here at the moment, what with ovens and lights on full blast across the house.

Jonathan, I also achieved a all-time record today. Dec 25th = 0.4 Kwhr. Lowest day since I got the installation in, including "storm bara". Monthly december yield so far? 46.5kwhr

Still think there's something off there for you on the days of very poor production. Even on a terrible day like today, your south facing panel should be beating my east/west split, yet I'm rocking in with +400% of what you have (rounding errors aside) . The engineer in me would love to know the reason however I'm unable to come up with one. My best effort is that the panels I have (q-cells) are better at dealing with "diffuse" light than your panels - but when the sun is shining your 4.8Kwp destroys my 5.3Kwp.....so they definetely are working, just not on the grim days.

Bif

Today’s work…

tnegun

https://www.boards.ie/discussion/comment/118372848#Comment_118372848

Our panels were installed in early November but due to several issues, I've only been generating for the last 10 days so don't have much to compare to. I see very similar low output to above on these dark days. It's a 4.18kWp system with 11x 380W Q-Cells and Solis-1P3.6K-4G inverter. The split is 1.52kWp south-west and 2.66kWp south-east. Today was my worse so far just .2kwh generated going by the Solarman app the inverter started at 9:30 and shutdown at 17:00.

championc

https://www.boards.ie/discussion/comment/118372940#Comment_118372940

Shutdown at 17:00 ??? Sunset was around 16:15