Renewables: "talking 'bout my generation"

Oneday77

Thanks for the previous explanation on O's, now I get it.


Today I'll certainly be heading for >1.0 O


I am however a little confused. If I go by my Invertor values.
Since installation I've generates 72.16 kW or 1.064 O's (17 days @ 3.99kw)
However my generation meter reads 68.58 kW (accounting for initial 0.5). Which gives me 1.011 O's
A difference of 5% near enough.


Is this normal or do I potentially have an issue? There is an iBoost in place but I'd expect the 2 meter's to match.

legoman62

Oneday77 wrote: »

Thanks for the previous explanation on O's, now I get it.


Today I'll certainly be heading for >1.0 O


I am however a little confused. If I go by my Invertor values.
Since installation I've generates 72.16 kW or 1.064 O's (17 days @ 3.99kw)
However my generation meter reads 68.58 kW (accounting for initial 0.5). Which gives me 1.011 O's
A difference of 5% near enough.


Is this normal or do I potentially have an issue? There is an iBoost in place but I'd expect the 2 meter's to match.

You should use your Gen meter. It will be more accurate.

I've got an SMA inverter that tends to read 1% higher ....of what I'm getting paid:)

I periodically adjust my inverter reading to match Gen meter.

Have you got this facility on yours?:D

Oscargrouch

Getting better by the day.....0.88 O's today........

Oneday77

legoman62 wrote: »

You should use your Gen meter. It will be more accurate.

I've got an SMA inverter that tends to read 1% higher ....of what I'm getting paid:)

I periodically adjust my inverter reading to match Gen meter.

Have you got this facility on yours?:D

Didn't know it could be possible, so will need to check. Though a 5% discrepancy seems a little to much for me to ignore. Over 10-20 years that would soon mount up, obviously I want the higher value recorded


Oh and for today, going by Solar Edge App, not home yet to check meter. I've had 2.07 O's who said the NE of Scotland was dull.

EricMears

legoman62 wrote: »

You should use your Gen meter. It will be more accurate.

It's not necessarily true that Gen meter is 'more accurate' as the allowable tolerances on an approved meter are so generous that an unapproved one might well be more accurate. However, it's the generation meter that will be accepted for your FIT claims so there's no point bothering to look at inverter reading in the hope that it might give you a 'better result'.

The only circumstances in which you might get your FIT paying company to take any notice of the inverter readings would probably be if you're convinced that TGM is faulty and could demonstrate that the inverter agrees with a PVGIS forecast but the TGM is hugely different (and I doubt they'd agree that 5% error is huge).

Oneday77

EricMears wrote: »

It's not necessarily true that Gen meter is 'more accurate' as the allowable tolerances on an approved meter are so generous that an unapproved one might well be more accurate. However, it's the generation meter that will be accepted for your FIT claims so there's no point bothering to look at inverter reading in the hope that it might give you a 'better result'.

The only circumstances in which you might get your FIT paying company to take any notice of the inverter readings would probably be if you're convinced that TGM is faulty and could demonstrate that the inverter agrees with a PVGIS forecast but the TGM is hugely different (and I doubt they'd agree that 5% error is huge).

I accept the Generation meter is what will dictate FIT readings, it's more why I queried it. Maybe I naively expected the 2 of them to run in parallel to each other. At the same time a 5% margin of error between 2 electronic, digital devices seems a little wide of the mark. 0.5% on each device resulting in a potential 1% of a difference would be believable.


It wasn't so much, I was looking for a 'better result', more a case of consistency and accuracy.


All I can do is monitor it and see if the margin increases, decreases or remains constant. If it digresses then there could be a fault.

Sterlingtimes

Today, I got one and a half Os.

Unlike prior "dromedary" days, today has been a double humper: a small hump in the morning and a bigger one in the afternoon.

ajbell

What can you do with excess electricity on good days once you have a tank of hot water?.
Any ideas?. I charge laptops and phones but just wondered if people put the spare kw's to any other use.
Can't stand to see it exported.

legoman62

EricMears wrote: »

It's not necessarily true that Gen meter is 'more accurate' as the allowable tolerances on an approved meter are so generous that an unapproved one might well be more accurate. However, it's the generation meter that will be accepted for your FIT claims so there's no point bothering to look at inverter reading in the hope that it might give you a 'better result'.

The only circumstances in which you might get your FIT paying company to take any notice of the inverter readings would probably be if you're convinced that TGM is faulty and could demonstrate that the inverter agrees with a PVGIS forecast but the TGM is hugely different (and I doubt they'd agree that 5% error is huge).

As I've mentioned on this board previously, I contacted SMA re-higher readings than Gen meter and was told,

"the piece of kit in the inverter used to measure generation costs about 10 pence compared to the Gen meter

price (£20.00 ish):D

I wish my inverter readings were right....I'd be another £70.00 up in FIT payments now:think:

pinnks

My SMA inverters are running slightly ahead of the generation meter. The 4000TL inverter has settled in at just over 1% ahead; the 1600TL, which was installed 9 months later has settled in at about 0.65% ahead.

But the only one that matters is the TGM...