So now I have a solar PV system how do I make the most of it???

zeupater

mickyduck wrote: »

Hi system being installed today, can you tell me how you estimated the monthly amounts. Would like to monitor my system as closely
TA

Hi mickyduck

Best to use the PVGIS estimation utility ..... http://re.jrc.ec.europa.eu/pvgis/apps4/pvest.php .... use the 'Climate SAF PVGIS' database ..... some refer to this as PVGIS-4.

HTH
Z

mickyduck

zeupater wrote: »

Hi mickyduck

Best to use the PVGIS estimation utility ..... http://re.jrc.ec.europa.eu/pvgis/apps4/pvest.php .... use the 'Climate SAF PVGIS' database ..... some refer to this as PVGIS-4.

HTH
Z

TA, will soon be up and runnimng the boys are hard at it.....

Inverter going in garage so well pleased as my loft gets VERY hot (I think the elctrician is happy as well as a much easier install....)

furndire

Good decision to get invertor in garage - I got the installers to move ours out of the loft, as I thought that it would be getting too hot - our loft has a very small space - would have meant that the fan would have to keep cutting in to cool it down - which in mind defeated the purpose, as it needed to use the electric it was producing to run the fan.

mickyduck

mickyduck wrote: »

TA, will soon be up and runnimng the boys are hard at it.....

Inverter going in garage so well pleased as my loft gets VERY hot (I think the elctrician is happy as well as a much easier install....)

Oh dear all come to a stop, my RCD keeps tripping when the inverter kicks in.... "its already near max load" Will need to seperate the garage onto another small fuse box tomorrow.

mickyduck

zeupater wrote: »

Hi mickyduck

Best to use the PVGIS estimation utility ..... http://re.jrc.ec.europa.eu/pvgis/apps4/pvest.php .... use the 'Climate SAF PVGIS' database ..... some refer to this as PVGIS-4.

HTH
Z

Is the 14 % loss (default) a sensible number to use, gives a total loss of about 20%?

teachergirl

Can't resist posting this. Just called my readings into EON and sat down to calculate my next payment. I underestimated it in my last post
Real payment should be £855.68:j:j:j:j


Can't wait.:D

zeupater

mickyduck wrote: »

Is the 14 % loss (default) a sensible number to use, gives a total loss of about 20%?

Hi

Most will leave it at a nominal 14% as this can be used as a basis for direct comparisons for benchmarking different systems using panels & inverters from various manufacturers. I personally use 7% which is in line with my own calculated losses for the inverter I have and my cable runs, I also use the actual flash test results for my panels to determine the true installed array capacity, doing this gives me a very close correlation between target & achieved generation. Any difference between monthly actuals & targets are then checked against met-office sunshine anomaly data, the result being a pretty accurate method of monitoring system performance.

You could do as I do and compare against an accurate target, or simply leave the losses at 14% and compare against a 'standard' target, it doesn't really matter which way you look at it as long as you understand what you're comparing your performance against.

The quickest and most common way to compare one system against another is simply to divide the generation by the nominal installed array capacity and therefore produce a common performance figure of kWh/kWp for the period (month or year).

HTH
Z

mickyduck

Thanks does not really matter too much as they will only generate what they will generate! If the losses are actually less it will make my actual generation Vs estimated potentially higher ie will make me feel better LOL

Excel sheet built reday to recieve numbers.....

jackieblack

teachergirl wrote: »

Can't resist posting this. Just called my readings into EON and sat down to calculate my next payment. I underestimated it in my last post
Real payment should be £855.68:j:j:j:j


Can't wait.:D

well done you! :T

Golauhaul

Hello,

I've just joined. Our PV system was installed yesterday. I'm puzzled by the maths, and would be most grateful for enlightenment!

1. I believe that I will in due course be paid under a FiT for 50% of my generated electricity (as recorded by my generation meter). That's at about 43p / KWh. Great.

2. If I generate more than I consume, I see that my analogue old consumption meter goes backwards. That will reduce my electricity bill by about 13p / KWh. In summer, this may be the outcome notwithstanding night consumption.

3. If I consume more than I generate, such that my consumption meter increases its reading, I will have the usual bill, for which units are charged at about 13p.

Now what I don't understand is how it is beneficial to use during the day as much as I can of "my" electricity: Look at these examples:

Example 1: During day I generate 10KW; use none; during night I generate none; use 10KW:

Generation = 10KW of which 50% deemed exported at 43p KWH = +£2.15; Consumption meter reverses during day by 10KW, saving 10 x 13p = £1.30;
Consumption at night = 10KWh @ 13p = -£1.30. Balance = +£2.15.

Example 2: During day I generate 10KW; use 10; during night I generate none; use 0.

Generation = 10KW of which 50% deemed exported at 43p KWH = +£2.15; Consumption meter does not move during day.
Consumption at night = 0. Balance = +£2.15.

Same result.

How does it pay to use by day? Where am I going wrong? !!