400w , signature solarWhat wattage and where did you get them?
400w , signature solarWhat wattage and where did you get them?
This is available on the USA sunny island. It's called frequency shifting power control.Another option which is on the EU version and hopefully in the US version too but this needs checking
Found out that the Solax X1 Boost G3, which is a cheap and freely available new UK G98 inverter, can be made to control its output via the connected Grid frequency.
https://community.victronenergy.com/que ... erter.html
The two parameters that need adjusting are
FreqSetPoint (Htz)
and
FreqDropRate (%)
So for a Sunny Island these would be set to 51Htz and 10% so that by 52Htz the output is zero.
You also have to set the Grid country to one that supports these parameters, eg EN50438_NL, VDE4105 or User Defined
and also play around with parameters to improve stability
Fac Upper and Fac Upper slow
These parameters are also on the G4 version but hidden a bit further down within Grid Services.
I should have been more explicit, I was referring to the EU Solax having the ability to be output controlled by a SI using frequency so maybe a US Solax could also have the same feature. This would then add the Solax to be another inverter that the SI can control to the SMA SB's and the Growatt.This is available on the USA sunny island.
oh. that's great to know about another pv inverter that works well AC coupled to a sunny island. Thanks.I should have been more explicit, I was referring to the EU Solax having the ability to be output controlled by a SI using frequency so maybe a US Solax could also have the same feature. This would then add the Solax to be another inverter that the SI can control to the SMA SB's and the Growatt.
Both US and EU SI's do frequency control, US is based on 60htz, EU is 50htz (well my EU also has the 60 htz option on initial setup but only at 220V for some reason)
I'm experiencing quite a bit of clipping during the middle of the day but I can't justify adding another string inverter right now.
That's not a bad idea. I could do two strings instead of one.Consider making some panels tilted steeper than those, half oriented SE and half SW.
That could reduce clipping, widen hours of production.
Another way to avoid the clipping would be to add a battery, that inverter would charge another 10kW at the same time - kill your ROI though…….Brought another 5.6kw of dirt cheap solar online.
Unirac rm10 mounts. Paid $400 for 25 of these. Drove 4 hours to pick them up. I didn't want to spend $2500 to install them on the roof. That would kill my ROI. With $1750 in the panels($1250 after tax credit) and $450 in the mounts( got to count the gas money) if these make the 7-8mwh a year I'm anticipating, they will pay themselves off in 2-4 years, depending on how much I self consume and how much I export to the poco
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I'm experiencing quite a bit of clipping during the middle of the day but I can't justify adding another string inverter right now.
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I've used that tool a lot. I'll send you a pm to learn how to model different facing arrays at once.My last purchase of panels is for an east/west array to smooth out the curve, panels were £35 each, inverter an SB3600TL-21 was £75. I did the simulation of the output using this tool.
JRC Photovoltaic Geographical Information System (PVGIS) - European Commission
Photovoltaic Geographical Information System (PVGIS)re.jrc.ec.europa.eu
There must be a US alternative, this site showed me I would get a flatter curve and add two more potential grid free months per year. All my other panels are south facing.
Lol. Yes that would kill my ROI. But, I'm not quite understanding -How would it avoid clipping?Another way to avoid the clipping would be to add a battery, that inverter would charge another 10kW at the same time - kill your ROI though…….
The inverter can use up to 11.4 + 10 = 21.4kW of PV power, 11.4 in AC power, another 10 to battery, if there is enough PV. I’ve never had that much PV and load at same time though, and batteries are already charged by then.How would it avoid clipping?
That's definitely something I need to think about. Thanks!It looks like you could definitely reorient some panels for evening production. And get better overall daily production. This also keeps you from dipping into the battery until later in the day.
It looks like morning is probably as good as it can be.
Oh ! I had no idea. That's cool!The inverter can use up to 11.4 + 10 = 21.4kW of PV power, 11.4 in AC power, another 10 to battery, if there is enough PV. I’ve never had that much PV and load at same time though, and batteries are already charged by then.
That's not a bad idea. I could do two strings instead of one.
Do you think over a year span that would result in greater overall output? I don't know a good way to model that
Not found a way to do it on the website, I instead do each string individually and export the monthly values as a CSV file and pull them into a spreadsheet. Then I add a total row at the bottom so I can see the total for all the strings. Then a row of the monthly KWH used and see which months exceed this plus 10%. This only works if you have batteries to exploit all the PV output.I've used that tool a lot. I'll send you a pm to learn how to model different facing arrays at once.
Thanks!