Solar PV Performance Thread - Post your monthly output

Hi,

I am seeing that more people are starting to put in their data which is good but just for new people the monthly generated sheet pulls your name and kWp installed from the first page which has more details on orientation cost of system etc. If your user name is not there just use any of the names called "Spare USER06" or whatever one if free, just change the name. I have created a few more spare users just in case.

Use this sheet to enter in your system details including user name, we can then use all this data later to do some detailed analysis and compare systems

Your user name and installed capacity should be linked and automatically populated from the Installation Details page so all you have to do here is enter your monthly data.

Rock on🤘

Thanks for the data, all you have to do once your data is in is filter the last column high to low. It now puts you second from top on overall generation for the year.

Yeah I think we do need the link on the first post but we need a mod for that. Or we just create a new thread.

If you have a CT on the tail from the inverter then the MyEnergi app will also show how much you generate.

I know this is a kind of a personal thing with how you view the production , but if you consume 53.8 Kwh, wouldn't most of that be consumed at the time it was generated and by definition during daylight hours (i.e. day rate) . Yeah, I guess you could put the 25Kwh that the Eddi used in at night time from the grid, but I think your doing yourself a disservice there. i.e. underreporting your own savings.

Not saying your wrong or anything, but curious as to your logic.

I'd say most of us are in about €20-30 quid this time of year. Here's my own spreadsheet updated to include the December data.

*Circuit breaker issue was only fixed in mid Dec, so was only using battery from then on (16 days or so)

I'm somewhat dubious about the 3% losses in roundtripping to/from the battery. 7% was what i had in November, and indeed GivEnergy do report a 92.5% battery efficiency in their own data....so my November figure was sort of "on point" with what i expected.

However, 97% efficient for Dec seems -too- good to be true, but that's what the inverter is reporting from the telemetry anyway. Dunno. I computed the savings with 97%..... it was only tens of cents in the difference, but while I'd like to hope that I've 97% efficient round trip.....I doubt it.

Since it's Winter, 100% of the electricity I generated was used during the day, so it was all day-rate price computations for solar.

yeah, I get where the losses would be , but the data that they present alludes to the fact that they are measuring at the right place.

From their blurb....

• Hybrid technology. Both AC and DC coupled. DC to DC charging minimising losses and maximising efficiency. Can also be charged from the Grid utilising a flexible energy tariff.
• High system round trip efficiency – 92.5%. Other systems are less efficient.

Sounds dubious to me though. I can potentially believe 7-8% losses, but 3% sounds too good to be true. Maybe I'm too pessimistic. Doubting bastard that i am :-) LOL

For me to measure it myself, I'd have to setup a test noting units on the consumer board charge the battery and see what was used, subtracting the "base load" ideally getting that to zero or close to zero.......and then plug in a device (say a 2Kw heater) and run that for 4-5 hrs, and have a measuring device like .....

Power Meter Dual Tariffs Rechargeable, Maxcio Electricity Usage Monitor UK Plug for Costs Voltage Amps Watt KWH, Large LCD Display Energy Monitor Consumption Analyzer for Home Appliances, No Backlight : Amazon.co.uk: DIY & Tools

To see what I get back. Not sure I've got the inclination :-)

7kWp South with 5kwh battery - but the 4kWp on the shed are in the shade since November so generation is less than 50% of what it could be 😰

Generated – 107kWh

EV - 94.5kWh so the generation covered the car at least

Import – 515 kWh

Best day – 14th 7.3kWh

Worst day - 25th 0kWh

Those measurement are probably made in ideal conditions and when all stars align. Similar way the car manufactures measure petrol consumption on their cars.

I have data for 1 year roundtrip to/from battery and I get 7.7% losses. 3% is very optimistic.

Since I had some time I have created myself a dashboard to see how much each day is costing me and how much I am saving. Since I have single tariff it is simple enough but once I get 'smart' plan later this month and start charging the batteries on cheap rate it will be interesting to see the figure and if they make sense. Obvioussly the savings are not great this time of the year but today looks promising.

2nd time posting in this thread.

Dublin - Lucan - December 21

7.12kW total installed (South: 3.45kW, East, 2.41kW, West (all with optimisers) 1.38kW). 5KWh Battery

Total Generation: 120kWh (46kWh consumed directly, 72kWh into battery, 2KWh to grid (Eddi))

Best Day: December 5th - 9.8kWh

Worst Day: December 25th - 0.4kWh

Total Consumption: 455kWh (29% Solar:71% Grid)

5.4kwp East West Split

7.5kwh total for December

Not what was promised by the sales rep-

Yearly total of 7100kwh

Finished out with 156 kWh for December (6.1 kWp)...middle two weeks of the month were a disaster.

New Years resolution is to get a better handle on my overall house energy consumption. Only moved into my house on the October bank holiday weekend and I am in the process of getting Home Assistant set up. I think I will get a years detailed energy data first and see if it will be worth my while getting a battery. I have an awful feeling I will be exporting a lot of energy (for free😪) come April on.....