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PV Inverter Not Starting Up: 2.5kW Installation, 8 Panels - How Long to Charge & How to Check?

bioton1987 33795 16
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Why won’t my newly installed 2.5 kW PV inverter start up, and how can I check whether the panels and wiring are OK?

The inverter should start immediately when the DC from the panels is present; there is no battery that needs hours of charging. Check that the DC disconnect at the bottom of the inverter and all breakers/isolators in the security box are switched on, then measure the DC voltage from the roof with a multimeter before unplugging anything, with the DC switch turned off first [#18349001][#18353539] For 8 panels, the DC voltage should be roughly 8 × 30 V ≈ 240 V, so if you get nothing or far too little, the fault is in the panel/string wiring, protection box, or inverter side [#18349178] In this case the issue was eventually found in damaged distribution boxes, where one had a bad internal connection, and after that was corrected the system worked [#18381750]
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  • #1 18348976
    bioton1987
    Level 9  
    Posts: 29
    Rate: 19
    Good day. I have such a problem, a photovoltaic installation has been set up for me. Exactly 8 panels with a power of 2.5 kW. The installers finished the assembly during the night, the day was cloudy, so they found that the inverter had not drawn power to fire and check if it works. A few days have passed, a bidirectional counter has been installed, but the inverter still does not start. The installer tells me there is a battery in there and it will take a while to recharge. My question is how long the inverter will run and is there any way to check if everything works as it should?
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  • #2 18349001
    marcinbbb
    Level 26  
    Posts: 812
    Help: 44
    Rate: 178
    It is supposed to start immediately after switching on, there is no battery there.
    At the bottom of the inverter, you should have a DC disconnect that should be turned on if it is on and nothing shows on the inverter's display you call the company to start 4 letters and come to check.
    It doesn't matter whether a cloudy day or a solar panel should be producing some part of the electricity. Also check in the security box if everything is on.
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  • #3 18349010
    noja102
    Level 24  
    Posts: 721
    Help: 38
    Rate: 244
    Give photos of inverter and security boxes as you can, because maybe something needs to be turned on

    Added after 1 [minutes]:

    Just like marcinbbb writes
  • #4 18349172
    bioton1987
    Level 9  
    Posts: 29
    Rate: 19
    Everything is on and no reaction. PV Inverter Not Starting Up: 2.5kW Installation, 8 Panels - How Long to Charge & How to Check? PV Inverter Not Starting Up: 2.5kW Installation, 8 Panels - How Long to Charge & How to Check? PV Inverter Not Starting Up: 2.5kW Installation, 8 Panels - How Long to Charge & How to Check? PV Inverter Not Starting Up: 2.5kW Installation, 8 Panels - How Long to Charge & How to Check? PV Inverter Not Starting Up: 2.5kW Installation, 8 Panels - How Long to Charge & How to Check?
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    #5 18349178
    marcinbbb
    Level 26  
    Posts: 812
    Help: 44
    Rate: 178
    I also have GoodWe, if the panels were well connected, the inverter would report "Falaut". So either the team forgot to fasten any of the panels on the roof or the inverter to be replaced. If you have a multimeter, disconnect the connection cables that come off the roof of the multimeter to check the DC voltage and check if the voltage is supplied from the roof should be around 8 * 30V = 240V and you need to set this range on the multimeter. Before unplugging the cables, switch the DC switch preventively !!!
    This way you will know what is the damaged inverter or somewhere on the panels or security.

    Regardless of the version, you call the crew and have them fix it
  • #6 18353277
    prose
    Level 36  
    Posts: 3031
    Help: 172
    Rate: 848
    I see 2 thongs, could there be 4 panels each?
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  • #7 18353371
    Tech132
    Level 29  
    Posts: 1082
    Help: 96
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    The fitter made 2 strings and therefore the inverter does not start because it has too low voltage, take a picture of the center of this separates what enter four wires from DC panels.
  • #8 18353403
    theo33
    Level 27  
    Posts: 849
    Help: 78
    Rate: 321
    Tech132 wrote:
    The fitter made 2 strings and therefore the inverter does not start because it has too low voltage, take a picture of the center of this separates what enter four wires from DC panels.


    It is rather one string, one arrester, two-pole protection and double pole break and two wires from panels and two to the inverter, the inverter also with one input
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  • #9 18353539
    prose
    Level 36  
    Posts: 3031
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    You just have to measure the voltage.
  • #10 18381750
    bioton1987
    Level 9  
    Posts: 29
    Rate: 19
    He writes a bit late, but the matter is already cleared. Apparently, damaged distribution boxes came out. One of them had a bad connection inside. The fitter has corrected and everything works.
    I still have a little question like that. I have an Otus 3 bidirectional meter installed and can someone tell me how to read it? I found some data on the net that, for example, 1.8.0 is the total energy consumed. And 1.8.0.1 or 1.8.0.2 and 1.8.0.3 are tariffs. I have a G11 tariff and from what I found on the net, I should only be interested in 1.8.0. And now at 1.8.0 it comes out to let's say 159.4 kWh and 1.8.0.1 comes out 129.5 kWh and soybeans for a long time. What this is about ? The same is the difference between the two measurements of energy produced 2.8.0 and 2.8.1. Anyone help something?
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    #11 18381760
    sq5lc
    Level 14  
    Posts: 55
    Help: 8
    Rate: 9
    1.8.0.1 - energy consumed last month, 2.8.0.1 - energy delivered last month. 1.8.0.2 etc. will appear in G11 in a month's time
  • #12 18381891
    bioton1987
    Level 9  
    Posts: 29
    Rate: 19
    I get it then. And why is there such a difference in the indications from the inverter and the meter? I have, for example, 19kwh produced on the inverter and in the application it shows the same and the meter shows 10 kWh in total.
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    #13 18381906
    Leon444
    Level 26  
    Posts: 948
    Help: 48
    Rate: 352
    Because you used 9kWh before the counter. The meter shows how much you gave to the network and not how much you produced, between the inverter and the meter you still have receivers at home (refrigerator, lighting, etc.) that consume the electricity produced.
  • #14 18381927
    bioton1987
    Level 9  
    Posts: 29
    Rate: 19
    So simply speaking, if I have to pay the bill at the moment, if I have 160 kWh consumed and 10 kWh returned, I will pay for 150 kWh?
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    #15 18381941
    sq5lc
    Level 14  
    Posts: 55
    Help: 8
    Rate: 9
    you will pay for 152 kWh - with an installation 10kW
  • #16 18381959
    bioton1987
    Level 9  
    Posts: 29
    Rate: 19
    Does this produced energy somehow balance that if I had to pay for 152 kWh in January and in March or April I would have a surplus of produced energy, it can be transferred to another month?
  • #17 18381998
    Leon444
    Level 26  
    Posts: 948
    Help: 48
    Rate: 352
    Balancing is various for a given year. You have to pay for what you used up last, you won't be paying until this year (if you balance your production x 0.8 compared to consumption.
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Topic summary

✨ A user reported issues with a 2.5 kW photovoltaic installation consisting of 8 panels, where the inverter failed to start after installation. Despite cloudy weather, the inverter should have activated, indicating potential issues with connections or the inverter itself. Responses suggested checking the DC disconnect, ensuring all components are powered, and verifying the voltage output from the panels using a multimeter. The user later discovered that damaged distribution boxes were the cause of the problem, which was resolved by the installer. Additionally, the user inquired about reading data from an Otus 3 bidirectional meter, clarifying energy consumption and production discrepancies.
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FAQ

TL;DR: On an 8-panel string, expect about 240 V DC (8×30 V). "The inverter would report 'Fault'." Check the DC isolator, measure string voltage, and call the installer. [Elektroda, marcinbbb, post #18349178]

Why it matters: This FAQ helps new PV owners fix a non-starting 2.5 kW inverter and read OTUS 3 meters to avoid downtime and billing surprises.

Quick Facts

Why won’t my new 2.5 kW PV inverter start on a cloudy day?

Clouds don't stop startup. Inverters start when PV DC and the grid are present. There is no internal battery. Confirm the DC isolator at the bottom is ON. Verify protections in the security box are ON. If the display stays blank, call the installer. [Elektroda, marcinbbb, post #18349001]

How long does an inverter need to “charge” before first start?

It doesn't. Grid-tied inverters have no battery to charge. They should start immediately after switching on. If it won't start, suspect wiring, disconnects, or protections. Ask the installer to commission and check it. [Elektroda, marcinbbb, post #18349001]

What DC voltage should I see from 8 panels in one string?

Expect about 240 V DC on eight panels in series. As noted, it “should be around 8×30 V = 240 V.” Set your multimeter to a suitable DC range. Turn the DC switch off before unplugging connectors. Near-zero or much lower voltage suggests an open connection. [Elektroda, marcinbbb, post #18349178]

How do I safely check if my PV string is delivering voltage?

  1. Turn the PV DC switch OFF.
  2. Disconnect the roof PV cables and measure DC voltage with a multimeter.
  3. Reconnect, turn the DC switch ON, and review the reading. Tip: “Before unplugging the cables, switch the DC switch.” [Elektroda, marcinbbb, post #18349178]

Could a wiring fault or low PV voltage stop the inverter from waking up?

Yes. A bad connection in a distribution/combiner box can block startup. In this case, a faulty box caused the issue. The fitter corrected the connection and the system worked. This failure can mimic low or zero PV voltage at the inverter. [Elektroda, bioton1987, post #18381750]

My GoodWe inverter display is blank — what should I check first?

If panels were connected correctly, GoodWe would report “Fault.” A blank screen suggests no PV DC is reaching the inverter. Measure the string voltage (about 240 V for eight panels). Turn the DC switch off before unplugging. Then call the crew to fix it. [Elektroda, marcinbbb, post #18349178]

What do the OTUS 3 meter codes 1.8.0, 1.8.0.1, 2.8.0, 2.8.0.1 mean?

1.8.0 is total grid consumption. 2.8.0 is total energy delivered to the grid. 1.8.0.1 and 2.8.0.1 show last month’s consumption and export. In G11, 1.8.0.2 will appear in the following month. [Elektroda, sq5lc, post #18381760]

Why does my inverter show 19 kWh produced but the meter shows only 10 kWh exported?

The inverter counts all PV generation. The bidirectional meter counts only exported energy. The 9 kWh difference was self-consumed before the meter. Household loads use PV first, then export the surplus. This is normal behavior. [Elektroda, Leon444, post #18381906]

If I used 160 kWh and exported 10 kWh, what will I be billed for?

For ≤10 kW systems, exported energy offsets part of consumption. In the example, you’d be billed for 152 kWh. That equals 160 minus an 8 kWh credit from 10 kWh exported. This matches the forum guidance. [Elektroda, sq5lc, post #18381941]

Do my PV export credits carry over to future months?

Yes. Prosumer balancing is settled across the year. You pay for what remains after applying the 0.8 factor to exports. Surplus in later months offsets earlier consumption within that year. Check your annual statement. [Elektroda, Leon444, post #18381998]

Is my 8‑panel array wired as one string or two?

From the photos discussed, users identified one string. There was one arrester, a two‑pole protection, and a double‑pole break. Two wires from panels feed the inverter’s single PV input. That indicates a single string layout. [Elektroda, theo33, post #18353403]

What was the final fix for the non-starting inverter in this thread?

Faulty distribution boxes were supplied. One had a bad internal connection. The installer corrected it, and the inverter started. Everything worked afterwards, confirming a connection fault. [Elektroda, bioton1987, post #18381750]
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