Solar options for home in 2022

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226 posts

Master Geek
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#3322482 19-Dec-2024 21:30

One thing i'm curious about, is the 3 of us complaining here about grid voltage are all using Fronius inverter. Do people with other inverters not experience curtailed output based on voltage? Surely that would be part of the lines company putting an inverter on the approved list.

Ge0rge

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#3322483 19-Dec-2024 21:32

I commented several pages back that my GoodWe inverter suffers the same issues.

Jase2985

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#3322484 19-Dec-2024 21:35

dantheperson:

One thing i'm curious about, is the 3 of us complaining here about grid voltage are all using Fronius inverter. Do people with other inverters not experience curtailed output based on voltage? Surely that would be part of the lines company putting an inverter on the approved list.

Was thinking that too, or fronius being from the EU, and their regulations etc have more settings/compliance in place which we over here haven't quiet worked out, or we have just hit some terrible sections of the grid.

Mine, I think, is down to some of the settings on the inverter that haven't been set up correctly/in alignment with Vector, ie more stringent, that I'm looking into.

HarmLessSolutions

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#3322486 19-Dec-2024 21:57

dantheperson:

One thing i'm curious about, is the 3 of us complaining here about grid voltage are all using Fronius inverter. Do people with other inverters not experience curtailed output based on voltage? Surely that would be part of the lines company putting an inverter on the approved list.

Prior to our upgrade in September 2023 we were running a 5kW SMA (which is currently for sale if anyone is interested). The comment from our installer in regards to our old inverter was that he recently did an upgrade for someone who was previously running 2 SMAs on their set-up, and has now added a Fronius to the mix. The Fronius immediately showed grid related output restrictions and our installers comment to the customer was that the SMAs had probably also been encountering output issues due to the grid voltage and were simply shutting down (by his estimation for up to 5 hours per day) but as the system hadn't been running any monitoring devices they would have been oblivious to it, other than having dismal generation performance.

My guess is that the excellent level of logged data that Fronius give means that we're aware of the issues that we're discussing here but many solar owners (with unmonitored data streams) just aren't.

https://www.harmlesssolutions.co.nz/

CrazyM

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#3322514 20-Dec-2024 07:41

dantheperson:

One thing i'm curious about, is the 3 of us complaining here about grid voltage are all using Fronius inverter. Do people with other inverters not experience curtailed output based on voltage? Surely that would be part of the lines company putting an inverter on the approved list.

Not my Huawei SUN2000-10KTL-M2. Output does not appear to drop based on voltage at all until it hits the limit voltage and shuts down, logging an error code with the time, and then starting up sometimes only a few seconds later when the voltage drops.

Perhaps it doesn't curtail output because it is the same size chassis that goes up to 20kW so there might be some headroom.

Also the lines company has recently tapped the transformers so that the network voltage never goes above 242V now 👍

EgorNZ

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Master Geek
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#3322567 20-Dec-2024 07:57

Are all of us with voltage rise issues on three-phase supplies with single-phase inverters?

Jase2985

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#3322573 20-Dec-2024 08:14

CrazyM:

dantheperson:

One thing i'm curious about, is the 3 of us complaining here about grid voltage are all using Fronius inverter. Do people with other inverters not experience curtailed output based on voltage? Surely that would be part of the lines company putting an inverter on the approved list.

Not my Huawei SUN2000-10KTL-M2. Output does not appear to drop based on voltage at all until it hits the limit voltage and shuts down, logging an error code with the time, and then starting up sometimes only a few seconds later when the voltage drops.

Perhaps it doesn't curtail output because it is the same size chassis that goes up to 20kW so there might be some headroom.

Also the lines company has recently tapped the transformers so that the network voltage never goes above 242V now 👍

It's nothing to do with headroom, its grid protection. it should be reducing output from 242-246V and hard shutdown at 250V

What is shutdown limit set at?

Jase2985

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#3322574 20-Dec-2024 08:15

EgorNZ:

Are all of us with voltage rise issues on three-phase supplies with single-phase inverters?

Nope single single here

HarmLessSolutions

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#3322580 20-Dec-2024 08:20

EgorNZ:

Are all of us with voltage rise issues on three-phase supplies with single-phase inverters?

Two phase connection into the house but single phase inverter here. We transferred the entire house onto one phase to simplify things and maximise self consumption.

https://www.harmlesssolutions.co.nz/

dantheperson

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#3322593 20-Dec-2024 09:06

EgorNZ:

Are all of us with voltage rise issues on three-phase supplies with single-phase inverters?

Single phase here.

EgorNZ

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#3322600 20-Dec-2024 09:17

Ah. Just me in that boat then! Wondered if it was a factor.

LightbulbNeil

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#3325792 29-Dec-2024 11:05

Yesterday for Hamilton should have been the perfect solar day. The software showed the a peak of 1179W/m2 for sunlighg energy. Yet my system didn't get over 13.3 kw generation at1.15pm when I looked. I am thinking that there maybe something wrong with the Fronius 15kw 3 phase inverter. Earlier in July it had a failed cooling fan and generation had benn all over. On a much less solar radience day, it has reached 15.1kw of production.
Over all for the day, the total production was very good. But it should have been at least 10% better than normal due to higher 1100W/m2 energy density.

Have I got the solar energy density wrong?

Has anyone else with a Fronius 15kW 3 phase inverter have seen any issues with their inverter?

I was yold its over heating from being in the sun. I madd a shade for it with no difference in performance.

Thanks for any input.
Neil Lickfold.

dantheperson

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#3325794 29-Dec-2024 11:23

LightbulbNeil: Yesterday for Hamilton should have been the perfect solar day. The software showed the a peak of 1179W/m2 for sun />Neil Lickfold.

Have you been checking mains voltage levels? I got the email this morning saying the inverter restarted yesterday afternoon due to high voltages. Output would have been curtailed long before it got to the point of restarting. I'm starting to grow a hunch that voltage management is worse on weekends and holidays.

Jase2985

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#3325795 29-Dec-2024 11:27

do you have access to the inverter via the IP address? do you have the technician login for the inverter? If you do you should be able to login and see the temps of the inverter

My single phase inverter shows these temps at the moment, it lives in a garage and it can sometimes be ~30°C in there:

AC-Module Temperature
46.90 °C
DC or Battery Module Temperature
35.66 °C
DC or Battery Module Temperature
31.19 °C
Inverter internal Temperature
38.37 °C

I have seen the AC-Module Temperature in the mid 50's

Sure it's not something else like voltage gird voltage or its hitting a power limit somewhere?

Jase2985

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#3325796 29-Dec-2024 11:29

dantheperson:
LightbulbNeil: Yesterday for Hamilton should have been the perfect solar day. The software showed the a peak of 1179W/m2 for sun />Neil Lickfold.

Have you been checking mains voltage levels? I got the email this morning saying the inverter restarted yesterday afternoon due to high voltages. Output would have been curtailed long before it got to the point of restarting. I'm starting to grow a hunch that voltage management is worse on weekends and holidays.

for me its defiantly related to what others are doing, if they are at home there seems to be more AC and other usage which lowers the grid voltage.

Vector is running our area at the higher end of the acceptable voltage range. which when a few people are generating power via solar it pushes the grid voltage up even more into that area where the inverter starts to curtail generation to compensate and not contribute to the issue anymore.

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