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Solar PV Hints, Tips & Troubleshooting

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  • Moderators, Education Moderators, Home & Garden Moderators Posts: 8,299 Mod ✭✭✭✭Jonathan


    Just had my Solis Inverter shut down for the first time with a DC-INTF alarm (Solis Cloud reports the alarm as 186BB - DC Over Current).

    A cool enough day (8°C) with strong breeze and intermittent clouds, so I suspect the panels are performing better than expected. Production at the time was hovering about 95% of kWp capacity, but I did see it spike to 103%.

    image.png

    Nothing obvious from the graph, but the polling interval is 30 seconds so possible that it was missed. As you can see from graph, generation resumed by itself.

    Anyone come across this before?



  • Registered Users, Registered Users 2 Posts: 208 ✭✭harderthanf


    No problem for me so far. Have been through a good few orange storms and one red. Steady as you like.



  • Registered Users, Registered Users 2 Posts: 2,602 ✭✭✭SD_DRACULA


    Haven't seen it myself, I have two strings one with 12 panels and one with 9.

    I assume you have more panels that that connected since you're pushing 600v on PV1? Was the battery full at the time?



  • Registered Users, Registered Users 2 Posts: 697 ✭✭✭bunderoon


    Do you mind telling us what your mounting system is like? I recall someone earlier showing a pic of the ground mount that was essentially made from re-used telegraph poles. That's some stable set-up.

    I have 1/2 acre beside and behind the our house. A clear view of the south-east & east sky. A 20' shipping container converted into an insulated shed which is about 20mts from the back of the house. But the house is on elevated land so we get a lot of wind.

    I'll more than than likely be going for a 30kw or 40kw second hand leaf in about 2 years when I change the diesel so I'm considering a sizable diy PV install in the field and have the diy battery etc all connected into the container and then a feed into the house mainboard.

    This and other boards threads have been fantastic for detailed information.



  • Moderators, Education Moderators, Home & Garden Moderators Posts: 8,299 Mod ✭✭✭✭Jonathan


    14 JA 345W panels on a single string. Probably sailing a bit close to the string limit but never had an issue before, even in strong winter sun. Pretty sure I worked out the Voc at -10°C and it was within 600V limit but will check again.

    Yes, battery full set the time.



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  • Registered Users, Registered Users 2 Posts: 2,602 ✭✭✭SD_DRACULA


    Who knows maybe during the 30 seconds it didn't record voltage it spiked above it for a split second and it was enough to trigger the alarm/protection.

    Found anything on that error in any Solis documentation?



  • Registered Users, Registered Users 2 Posts: 1,689 ✭✭✭THE ALM


    I would imagine it is spiking this weather with so much intermittent cloud cover. Have 12 panels on a string and a spike of 8.11kW the other day. Didn't record any error and you are adding another couple of panels at 14.


    Spike.jpg




  • Registered Users, Registered Users 2 Posts: 1,689 ✭✭✭THE ALM


    Had the SEAI inspection carried out on Tuesday and confirmation that it has passed -

    'SEAI is pleased to inform you that the solar PV system installed has successfully passed inspection on the basis that they substantially meet the requirements of the Solar PV Scheme'

    For those worried about going over the planning limit SEAI are not too worried anyway 😁

    Straight forward process and completed in about 15-20mins.



  • Registered Users, Registered Users 2 Posts: 28 AGC22


    Hi Guys, I've only had my system about 2 weeks and have gotten a few "DC over voltage" alarms. Some are 186BB and some 186B4. Seems to resolve itself after a period of time. I've no idea why it's happening.

    I've a 6kw Solis hybrid inverter, 12 X 455 panels on West string with 8 X 455 on East. Pretty sure batteries were full.

    Is it something to be concerned about?




  • Registered Users, Registered Users 2 Posts: 28 AGC22


    Separately, I'm using the Solis cloud app (installer said to download). Is there a better one or am I restricted to this one?



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  • Registered Users, Registered Users 2 Posts: 2,602 ✭✭✭SD_DRACULA


    Not for me. They bitched about my shed string, almost flat roof but it had no edge clearances, panels are exactly the size of the roof.

    My front roof is more than 50% covered and they don't care, that's for the council, they only care about the 500mm/200mm clearances.

    Had to get my installer to move some panels, take pictures and put them back, stupid AF.

    The inspector did say that if I had the PV2 string disconnected from the inverter he couldn't add it to the inspection so it would have passed. 🤦‍♂️

    FIY for anyone doing something similar, just disconnect it.



  • Registered Users, Registered Users 2 Posts: 2,662 ✭✭✭bullit_dodger


    To be fair my SEAI BER inspection was fine. Mostly it's done by an independent contractor and not SEAI employee themselves. The lad in question seemed oblivious that the grant requirements for solar had changed (in Feb!), but maybe that's a line he was telling me rather than wanting to "stir the pot". The one that got me was that even if I had an airtight balloon inserted into the chimney, it wouldn't actually make a difference to the BER rating until the chimney was sealed off (with cement). Eh?? What?

    I sort of get the distances that they want from the edges, or at least I can get in behind that there might potentially be some airflow issue where panels would come under more duress close to the edge of a roof due to turbulent air passing over/around the edges and that may increase the likelihood that a panel would lift from the roof and behind a hazard. That said, it's a stretch to me.

    Then you couple that to the "if Pv2 was disconnected then it's not my problem" you are left wondering.......why bother lads? The idea of a BER is sound and honestly, I'd say they have saved tons of carbon emissions over the years, but they should have a nod to common sense too.



  • Registered Users, Registered Users 2 Posts: 189 ✭✭connesha


    I've been getting a couple of "DC Over Current" alarms too. One a bit before noon today actually. Solis Hybrid 6kw 5G

    Recovers after a few mins. I haven't looked into it further yet.



  • Moderators, Home & Garden Moderators Posts: 7,016 Mod ✭✭✭✭graememk


    I think he was on about the Seai inspection, not the ber.

    But yeah the distance from the edge seems to be the red line. My installer was quite particular about it. Even though he wouldn't get near my panels unless they take a extending ladder with them!

    But yeah if the second string isn't connected, it's not part of the solar install.. the box doesn't need ticked...


    Red tape for you!



  • Registered Users, Registered Users 2 Posts: 6,444 ✭✭✭championc




  • Registered Users Posts: 497 ✭✭septicsac


    Discussion on RTE Radio 1 today, statement from department saying we will start to see payments for power exported from July this year and will be backdated to February. That was all I heard, no mention of price per unit etc.



  • Registered Users, Registered Users 2 Posts: 3,275 ✭✭✭irishchris




  • Registered Users, Registered Users 2 Posts: 28 AGC22




  • Moderators, Home & Garden Moderators Posts: 7,016 Mod ✭✭✭✭graememk


    What's your grid voltage too at the times just before it hits 600v?

    Were you exporting a lot at that point?



  • Registered Users, Registered Users 2 Posts: 6,444 ✭✭✭championc


    Assuming your inverters Input DC Voltage max is 600v, it was 100% correct to throw an alarm because your data clearly shows you hitting 600v.

    Be aware that Solis too see this data from their cloud, and so if the inverter blows because of this, they will point at this as a contributing factor.

    So data helps them too to defend warranty claims !!!



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  • Registered Users, Registered Users 2 Posts: 28 AGC22


    Any thoughts on what's causing it, is it too much power from panels on that string?



  • Registered Users, Registered Users 2 Posts: 28 AGC22


    Screenshot_2022-04-08-00-44-29-552_com.ginlongsolis.jpg

    Looks like grid Voltage was under 300, pretty consistent. Would have been mostly exporting as batteries were full



  • Moderators, Home & Garden Moderators Posts: 7,016 Mod ✭✭✭✭graememk


    If the grid voltage is too high (above 250 I think) the inverter will shut off.

    Thus taking the load off the panels, which allows the voltage to rise up because there is no load on them



  • Moderators, Education Moderators, Home & Garden Moderators Posts: 8,299 Mod ✭✭✭✭Jonathan


    Turns out I was wrong. The 14 panels were under the 600V limit without the temperature compensation, but over the limit when compensation applied. However, I've never seen it be an issue before yesterday. 🤷

    Suspect it is because the panels are south facing and so are only going to be getting sun at very acute angles in the morning when panels are at their coldest. The voltage will decrease as the panels warm up by the time the sun is perpendicular and at its peak.

    455W panels are big panels, particular compared to my 345W panels. I suspect 12 of the 455W panels could be over the 600V limit before temperature compensation is applied if connected in series, but they might be installed in parallel too which could resolve it.

    253V usually (230+10%). However, I don't think that is the issue in this case. I think this is on the DC side.



  • Moderators, Home & Garden Moderators Posts: 7,016 Mod ✭✭✭✭graememk


    I understand it could be on the DC side, but the spike is almost vertical... Which led the theory that the inverter shut off because of high grid, thus putting the panels basically into a open circuit, at that point it would be at max voltage. There is a corresponding spike on the voltage of the other string.

    The max MPPT on the solis inverters is 500V i think so that also could be hit...

    the JA solar 455W open circuit voltage is 49.7 * 12 is 596V in STC conditions, (1000w/m2, cell temp 25C)



  • Registered Users, Registered Users 2 Posts: 1,135 ✭✭✭mun1


    Cold day with wind (like today), panels are at low temperature , with rainclouds clouds around and a strong sun between the cloud would lead to string max DC Voltage being reached and passed Voc , If you had 12+ panels. Panels cant heat up enough to drop the voltage so voltage spike will happen.



  • Registered Users, Registered Users 2 Posts: 2,602 ✭✭✭SD_DRACULA


    Is anyone local (Dulbin West) with a spare set pylontech cables they can loan me this weekend?

    Ran in a bit of an issue with the cable pack I have with my batteries as in the connectors don't fit my solis inverter, too big.

    Existing puredrive cable 25mm2, new cable 35mm2.

    image.png

    The other end of the cable is a typical lug type.

    Or can the round plugs on the inverter battery plugs be screwed off and the lug can then get attached?



  • Registered Users Posts: 497 ✭✭septicsac




  • Registered Users, Registered Users 2 Posts: 374 ✭✭samdeluxjones


    Missus heard it too but can't find anything more about it. If it is the case whoever has a smart meter has been logging feed in since February and I'm having fierce bother getting one because I'm dual tariff which is a dose..



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  • Registered Users, Registered Users 2 Posts: 2,602 ✭✭✭SD_DRACULA


    Wouldn't lose sleep over it, if they pay 5c per kwh then standing charge will go up by €100 easily, like with any BS grants given by the gvmnt.



This discussion has been closed.
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