How do you monitor your PV production? With a DIN-rail meter of with current clamps?
Cheers,
-Bart.
bazzle |
With my newish Flukso V2 and its current clamps.
Solar one around wire from inverter output.
I also have a direct recording from the inverters using proprietry software when it is operating. (ProControl serial link to inverter)
The Flukso always reads higher.
At about 14:30 there is about 300w difference.
Blue is solar on Flukso
Red on ProControl
Bazzle
icarus75 |
A grid-tie inverter should have a near unity power factor. The inverter will also shut down when the
available PV power is less than the total loss of the inverter system. So the measured power output should be zero at night and fairly closely track the real output power.
Are you sure that you're not measuring other loads besides the PV inverter with the clamp?
bazzle |
No other loads. Clamp on dedicated cct from solar breaker that comes from inverter.
Its always consistently about 116w at night.
You can see it on my graphs on your site.
Got me miffed :(
Bazzle
ghostgum |
Is the current clamp in clear space, or is it pushed up against the side of a circuit breaker with its own magnetic field?
bazzle |
Its pretty crowded next to the breaker rail so I tried the solar one about 100mm away on the solar input, same thing.
If I remove off the wires completely it goes to '0'.
Ghosts in the box.
Bazzle
DB_Ackermann |
Hello. We have the same effect here with seven solar inverters.
We get a base line of 500(+/-0) watts every night. I can reproduce an incremental staircaise graph when i disconnect one by one. Each step is about 500/7 watt.
Solar inverter wiring is completley separated from any appliance. Disconnecting solarinverters results in a base line of zero watts.
I think it is caused by reactive power compensation to the rest of the direct or distant appliances.
Christoph
bazzle |
Thank you Christoph.
at least its sort of normal.
Cheers Bazzle
cackermann |
Bazzle,
we think about to use a DIN rail counter and using pulse input. Free clamps can be used to measure other appliances.
Do you just run a pair of wires to the Flukso and enable the input on the lan page?
What setting do you give the counts on the sensor?
Cheers Bazzle
bazzle |
Ill answer :)
Yes direct conn.
Constant = 0.5 for me (2000 i/kwh)
Cheers all
Bazzle
bazzle |
Dropped to .48 to get same reading as inverter.
'0' watts at night last night :)
Bazzle
icarus75 |
I guess you can now finally sleep at night. :-)
I'm still puzzled that the current clamp gave such an onerous reading for your PV output.According to the theory, a grid tie inverter is unable to produce reactive power itself. Then again, your inverter will be switched off at night. If the inverter has reactive components (capacitors or inductors) in its output circuitry, then the grid will feed reactive current to the inverter when it's switched off.
Cheers,
Bart.
bazzle |
As I see I was not alone with that, others here and on other forums too.
It must be due to other induced mag field or ??
Hi Bazzle,
How do you monitor your PV production? With a DIN-rail meter of with current clamps?
Cheers,
-Bart.
With my newish Flukso V2 and its current clamps.
Solar one around wire from inverter output.
I also have a direct recording from the inverters using proprietry software when it is operating. (ProControl serial link to inverter)
The Flukso always reads higher.
This is Flukso
http://i8.photobucket.com/albums/a19/bazzslk230/Flukso/FluksoJan15th12.jpg
This is ProControl
http://i8.photobucket.com/albums/a19/bazzslk230/Flukso/ProControlJan15th...
At about 14:30 there is about 300w difference.
Blue is solar on Flukso
Red on ProControl
Bazzle
A grid-tie inverter should have a near unity power factor. The inverter will also shut down when the
available PV power is less than the total loss of the inverter system. So the measured power output should be zero at night and fairly closely track the real output power.
Are you sure that you're not measuring other loads besides the PV inverter with the clamp?
No other loads. Clamp on dedicated cct from solar breaker that comes from inverter.
Its always consistently about 116w at night.
You can see it on my graphs on your site.
Got me miffed :(
Bazzle
Is the current clamp in clear space, or is it pushed up against the side of a circuit breaker with its own magnetic field?
Its pretty crowded next to the breaker rail so I tried the solar one about 100mm away on the solar input, same thing.
If I remove off the wires completely it goes to '0'.
Ghosts in the box.
Bazzle
Hello. We have the same effect here with seven solar inverters.
We get a base line of 500(+/-0) watts every night. I can reproduce an incremental staircaise graph when i disconnect one by one. Each step is about 500/7 watt.
Solar inverter wiring is completley separated from any appliance. Disconnecting solarinverters results in a base line of zero watts.
I think it is caused by reactive power compensation to the rest of the direct or distant appliances.
Christoph
Thank you Christoph.
at least its sort of normal.
Cheers Bazzle
Bazzle,
we think about to use a DIN rail counter and using pulse input. Free clamps can be used to measure other appliances.
Christoph
Christoph
Can you provide more info please?
Pix, links?
Bazzle
Hello Bazzle,
i use these counters successfully with Flukso.
For single phase: FINDER 7E.23.8.230.0010
http://datenblatt.stark-elektronik.de/finder/7E.23.8.230.0010.pdf
For three phase: FINDER 7E.46.8.400.0012
http://datenblatt.stark-elektronik.de/finder/7E.46.8.400.0012.pdf
Other Vendors (Hager, Siemens etc.) have similar produkts. Pulse output needs to be 1000 per KWh (or one per Wh)!!!
Christoph
I like the idea.
I assume there are output terminals hat you just connect to the Flukso v2?
Do you have any idea of cost in your country?
I would like to compare to local here in Oz
http://www.sparkydirect.com.au/p/864376/single-phase-kilowatt-hour-meter...
http://www.latronics.com.au/products/latronics-kwh-meter
Cheers Bazzle
A single phase finder costs about 60 Euros in Germany. The 3phase costs ab. 150 Euros
The 2nd one (latronics) is perfekt!
Cheers
Christoph
Purchased this one $38 Oz :)
http://www.schnap.com.au/kilowatt-hour-meter/single-phase-electric-kilow...
Bazzle
Hi
Do you just run a pair of wires to the Flukso and enable the input on the lan page?
What setting do you give the counts on the sensor?
Cheers Bazzle
Ill answer :)
Yes direct conn.
Constant = 0.5 for me (2000 i/kwh)
Cheers all
Bazzle
Dropped to .48 to get same reading as inverter.
'0' watts at night last night :)
Bazzle
I guess you can now finally sleep at night. :-)
I'm still puzzled that the current clamp gave such an onerous reading for your PV output.According to the theory, a grid tie inverter is unable to produce reactive power itself. Then again, your inverter will be switched off at night. If the inverter has reactive components (capacitors or inductors) in its output circuitry, then the grid will feed reactive current to the inverter when it's switched off.
Cheers,
Bart.
As I see I was not alone with that, others here and on other forums too.
It must be due to other induced mag field or ??
Bazzle