Renewables: "talking 'bout my generation"

1961Nick

Oscargrouch wrote: »

Eric does not agree with O's posting, but his number = 0.0025 O's, don't understand why he does not like em..

0.64 O's for me....who gets the spoon....

Cruel!:rotfl:

Merlin139 wrote: »

If it was magic I would make the house next to me invisable so it did not effect me later in the day.:D

I think that I am very lucky at the moment but each panel does have its own optimizer which makes a big difference when its not wall to wall sun. Today the production of each panel ranged from 359.25W to 476.00W.

I work in Bridlington and it can be beautiful and sunny there and when I look at production on my phone its non existant back in Driffield and its 10 miles away.

Maybe later in the year you will have the luck and I will be in the clouds!

Whatever the reason your system seems to be a clear winner at this time of year. That's quite a result being so northerly & with some shading.

What are these 'optimizers' you have fitted?

Andy_WSM

1961Nick wrote: »

What are these 'optimizers' you have fitted?

With the numbers he's posting I'm guessing the optimizers are a bank of floodlights plugged in to next doors electricity supply! :beer:

EricMears

Oscargrouch wrote: »

Eric does not agree with O's posting, but his number = 0.0025 O's, don't understand why he does not like em

I'm sure I've explained it many times before but for the benefit of anyone who has missed it:-

kWp is just one of the variables that affects how much electricity you can generate in a day. To ignore location, roof slope and the compass direction the panels face makes a 'raw O' meaningless.

You'll notice that all four variables are given in my postings so anyone who has nothing better to do with their time than dividing by 4000 can indulge themselves.

Sterlingtimes

Andy_WSM wrote: »

With the numbers he's posting I'm guessing the optimizers are a bank of floodlights plugged in to next doors electricity supply! :beer:

I'm with Andy on this one. Clearly, there's something odd going on there.:)

Sterlingtimes

EricMears wrote: »

... kWp is just one of the variables that affects how much electricity you can generate in a day. To ignore location, roof slope and the compass direction the panels face makes a 'raw O' meaningless.

Technically, I think you are correct. The denominator and numerator are different units so the O is kWh/kW, seemingly hours rather than a pure ratio. Nonetheless, we can surely all understand that it serves as a useful comparison between systems.

A better approximation may be the daily kWh produced divided monthly PVGIS/number of days in month. I'm not sure whether daily PVGIS's are available.

So my January daily PVGIS would be 121/31 = 3903 Wh. I know that the spread is not linear across the month.

Say my daily output is 3000, we would now have 3000 Wh/3903 Wh = 0.77. This number does take into account some of the variables that you mention.

Waywardmike

I think I may be reaping the benefit of being quite southerly.... not THAT far south though (Bedford)

We had the snow yesterday afternoon here at work.. got home and it was clear...

Yesterday I managed 8.9 kWh so 2.225 O's...

Today I woke up with snow on the panels but just checking now I've already hit 2.2kWh and was producing 3kW so I'm assuming it's either slid off or melted....

January is looking at being a spectacular month for me.. 131% of PVGIS estimate with a day and a half still to go....

good times....

Andy_WSM

Today was looking promising with nearly an O in the bag already and nice toasty under floor heating taking up the excess, but pesky cloud is building. Grrrr.

EricMears

Sterlingtimes wrote: »

Technically, I think you are correct. The denominator and numerator are different units so the O is kWh/kW, seemingly hours rather than a pure ratio. Nonetheless, we can surely all understand that it serves as a useful comparison between systems.

A better approximation may be the daily kWh produced divided monthly PVGIS/number of days in month. I'm not sure whether daily PVGIS's are available.

So my January daily PVGIS would be 121/31 = 3903 Wh. I know that the spread is not linear across the month.

Say my daily output is 3000, we would now have 3000 Wh/3903 Wh = 0.77. This number does take into account some of the variables that you mention.

Er No, NOT all of us agree that comparing one factor out of a possible 4 is any use at all. An example I've given before is when two people attempt to compare miles per gallon on their respective cars without allowing for the fact that one car might be twice as heavy as the other, one may be driven exclusively in a congested town whilst other spends most time on a motorway etc etc

Comparing one days generation with the PVGIS forecast for that day would indeed be a much sounder comparison. All the variables (except perhaps shading) would be taken into account. I don't think individual daily PVGIS forecasts are readily available although I did once devote a rather long (and no doubt boring to most ) posting to an explanation of how one could extrapolate from monthly averages to a pretty good approximation of daily ones. I won't repeat in full it here but the basic principle was to get the first days figure by averaging last month's forecast with this month's, the last day's by averaging this month & next & the middle day's from an average of three months. Then you average 1st & 15th to get a result for the 8th 1st & 8th to get one for 4th or 5th etc etc etc. (I did say it was tedious !). There are a few dubious assumptions there in that I assume last day of one month and first day of next would have same forecast and that a forecast for the four and a halfth day would be equally applicable to 4th & 5th but heck, normal daily weather variations would easily account for even bigger errors.

Andy_WSM

1.75 O's (6.87 kWh)

A good morning, followed by a poor afternoon.

jimmyboy420

Nice - I've had more like 0.85 Os...