Creatura Posted April 30, 2022 Posted April 30, 2022 Hi there. I have two inverters EaSun iGrid SV II 5kw and im getting error 72 all the time when its sunny outside. After my research i found out that i need to update the software. The problem is i havent found any software on the internet. Also then support from easun its not even answear. Can you guys help me with a firmware for this type of inverter? I know that software from mpp solar also works with easun. Quote
Coulomb Posted April 30, 2022 Posted April 30, 2022 1 hour ago, Creatura said: I have two inverters EaSun iGrid SV II 5kw What main (U1) firmware does it come with now? The only Axpert VM II firmware that I have, 20.44, is quite old, and doesn't seem to have that fault code at all. Quote
Beat Posted April 30, 2022 Posted April 30, 2022 6 hours ago, Creatura said: I have two inverters EaSun iGrid SV II 5kw and im getting error 72 all the time when its sunny outside. When this error code, meaning "Current sharing fault" appeared on my MKS 5K inverters, it turned out to be a faulty parallel board. Replacement (in guarantee) solved the problem. I now have 2 parallel board kits in spare. I could help out. Quote
Coulomb Posted April 30, 2022 Posted April 30, 2022 (edited) Actually, I didn't think that any of the "V" models can be paralleled. So probably I'm wrong about what this model is based on / copied from. Edit 2022/Sep: Indeed, EASun IGrid models are all on-grid (grid tie, capable of export, Infinisolar models or clones thereof). EASun off-grid Axperts (or clones thereof) are ISolar models as opposed to IGrid models. Edited September 15, 2022 by Coulomb Quote
Creatura Posted May 1, 2022 Author Posted May 1, 2022 @Beat allright im gone order another boards Quote
Coulomb Posted May 1, 2022 Posted May 1, 2022 5 hours ago, Creatura said: i got something love U1 11 etc Sorry, I don't understand the above. Something lost in translation perhaps? Quote
Beat Posted May 2, 2022 Posted May 2, 2022 On 2022/05/01 at 8:36 AM, Creatura said: allright im gone order another boards The crux is that you can't know witch one of the two is faulty. You have to try to replace one with 50/50% chance to hit the faulty one. If after replacing the first the error persists, you have to replace the other one. But first make sure that the 4 cables are in good condition and well connected. Quote
Creatura Posted May 3, 2022 Author Posted May 3, 2022 @Coulomb i mean i got something like U1 11 Etc . @Beat Tomorow im gone replace both boards. Quote
Coulomb Posted May 4, 2022 Posted May 4, 2022 (edited) 9 hours ago, Creatura said: i mean i got something like U1 11 Etc . Ah, ok. That sounds like it's actually an ON-grid (grid interactive) model, i.e. a copy of an Infini, not an Axpert. [ Edit: Specifically, An Infini V2. ] Those are a bit different inside. [ Edit 2: And the firmwares are quite different, and harder to find. ] Edited May 4, 2022 by Coulomb Quote
Creatura Posted May 4, 2022 Author Posted May 4, 2022 @Coulombreplaced the parallel boards firmware U1 52 29 The problem is still there. They are original boards from EASUN website the inverters are hybrid 5kw when its sunny outside (one inverter have almost 5000w pv input) other one have @ 3000w pv input, the voltage start to fluctuate from 230 to 215 etc. I got no ideea what the problem might be I might have to sell them ... Quote
Creatura Posted May 4, 2022 Author Posted May 4, 2022 Here you can see a video with the problem! Quote
Coulomb Posted May 4, 2022 Posted May 4, 2022 (edited) 25 minutes ago, Creatura said: Here you can see a video with the problem! I see that it's an Infini V2 clone, despite the firmware version number. I know little about the Infinis. I see that there is no AC-in; this seems unusual for a grid tied inverter. I assume that the screen below is showing AC input voltage of 0 V: I didn't see any fault code 72s. I assume you know that "HS" in the middle is meant to tell you that this is the MaSter inverter, the other one is the SLave. What is fault code 72 for your inverter? For an Axpert, it would be current sharing fault. If it's the same for your EASun, then I would check the output wiring, and the red-black twisted cables between inverters, that connect to the paralleling boards. Also make sure that the green plugs are pushed in properly. Edit: the fluctuating voltage will be the inverters attempting to share the small load. I assume that Infinis should share the loads about the same as Axperts, when there is no AC-in to stabilise the voltage. Are your output cables about the same length? Do they "daisy chain" to the loads? Edited May 4, 2022 by Coulomb Quote
Creatura Posted May 4, 2022 Author Posted May 4, 2022 i am only offgrid, i dont have any ac here. u cant see the error cuz didnt came in, if i was waiting a little more the error would popup. Yes the fault code its 72, current sharing. i have checked all the cables, replace them the red and black twisted one. changed even the vga cables, parallel boards. Also changed 3 times the ac out cables. they are same dimmensions and thikness for both of them (maybe 1 cm max difference.) what do you mean by daisy chain? Quote
Coulomb Posted May 4, 2022 Posted May 4, 2022 (edited) 3 hours ago, Creatura said: what do you mean by daisy chain? I mean if inverter A's AC-out connects to inverter B's AC-out, which then connects to the load. As opposed to a "star connection" where all the inverters connect to the load via a central junction point. It might also be daisy chaining after the isolators. Both inverters should parallel after isolating breakers, and the cables to the junction where they parallel should be a similar length. It sounds like they are. All I can think of is these clone copiers didn't understand the current sharing circuit (it took me ages to vaguely understand it), and didn't implement it properly. My understanding is that there is an ADC port dedicated to reading the current output from other inverters when you are the master. If it reads zero or random values, that could explain the flickering lights and unstable output voltage. Did you try turning off and on the power switch on the master? This will swap master and slave, maybe the other inverter doesn't have the problem and can be a stable master. I assume that each inverter on its own powers the loads stably (lights don't flicker)? Edited May 4, 2022 by Coulomb Quote
Creatura Posted May 5, 2022 Author Posted May 5, 2022 Well if i use only one inverter everything works perfect. It doesnt matter if is inverter 1 or 2. I will try to switch the.master but far as i remember i allready tried it. The ac out wire (aprox 1.4m each) goes in to a breaker where both N and L connects on that mai breaker. I have repleaced the breaker. Still the same problem. After the main breaker (100A) breaker, it goes on to the mail table of breakers. Quote
Creatura Posted May 5, 2022 Author Posted May 5, 2022 I forgot to mention, that if there is no pv input, the paralel works very good, no light flick. Each inverter has 8 solar panels (380w solar panel) in series, and the 8 solar panels are connected on paralel with another series (total 16 solar panels for each inverter) So its 8sp2 for each inverter, i did something wrong with pv input? Only when its sunny outside the lights flicks Quote
Coulomb Posted May 5, 2022 Posted May 5, 2022 8 hours ago, Creatura said: Only when its sunny outside the lights flicks Ah. That's fairly significant. it sounds vaguely familiar, too. What is the PV voltage when it is flickering? I would think that 8 panels would not be pushing the ≈450 VDC maximum MPPT voltage, let alone the ≈500 VDC absolute limit, but it might. The inverters might be attempting to limit the bus voltage by doing something drastic. Please check the actual limits (MPPT max and overall max) for your actual models. If you're between the MPPT max and the absolute max, it may be that the solar controller can't regulate the solar power properly, which might result in the flickering, perhaps because it can't regulate the bus voltage. These higher voltage SCC models have a difficult job transferring solar power to the loads. First, there is the MPPT boost stage, but it can't buck the voltage at all, just pass it through or boost it higher. So if your panels are at say 450 V, then the bus voltage has to be 450 V as well. That's what the DC-AC inverter-proper chops up to create the 220/230/240 VAC sine wave for the loads. If the bus voltage is jerking up and down because the MPPT can't regulate it, then the DC-AC stage has to adjust its PWM amplitude to try and produce a constant output voltage. There is a control system for that, but it will have its limitations, and won't be able to react perfectly quickly. Quote
Creatura Posted May 6, 2022 Author Posted May 6, 2022 Well the voltage its in the limit, 280v but there might not be the amps. The solar panel produce 10.8 amps max, when i use 8ps2 i might get 21 amps, when the limit is 20a far as i know for this model. Quote
Coulomb Posted May 6, 2022 Posted May 6, 2022 10 hours ago, Creatura said: The solar panel produce 10.8 amps max, when i use 8ps2 i might get 21 amps, when the limit is 20a far as i know for this model. I assume you mean 8S2P, 8 panels in series, two such strings paralleled. Ah. The Infini model that these are presumably copied from has a limit of 18 A. But it just has to not "ask" for more than 18 A. I don't know enough about the higher voltage SCCs to know if this might be a factor. Quote
Creatura Posted May 6, 2022 Author Posted May 6, 2022 I have atached a photo with infos about it. I do have 32 solar panels 375 longi solar panels. What is the best setup to use them? Quote
Coulomb Posted May 7, 2022 Posted May 7, 2022 Yes 8S2P on each inverter, which I believe is what you have. You're a little over on the current limit, as I say I don't know what the implications of that are. Quote
Creatura Posted May 7, 2022 Author Posted May 7, 2022 Well thats what im using and still got the error. I will try 8p on sunny day. Quote
Kilowatt Power Posted May 8, 2022 Posted May 8, 2022 On 2022/05/04 at 11:24 AM, Creatura said: Here you can see a video with the problem! Are these your solar panels in the screengrab below? Approximately how far in meters are they situated from the inverter(s)? What gauge cable are you using, 4mm^2 or 6mm^2? Quote
Kilowatt Power Posted May 8, 2022 Posted May 8, 2022 (edited) On 2022/05/06 at 10:08 PM, Creatura said: I do have 32 solar panels 375 longi solar panels. What is the best setup to use them? Assuming you have Longi 375W LR4-60HPH 375/MR with 41.1Voc, 11.6Isc, 34.6Vmp and 10.84Imp, then I would go for 10s1p (411Voc, 346Vmp, 10.84Imp) to bring overall Vmp as close as possible to the 360Vdc nominal operating voltage and operate within the 225 - 430 Vdc MPPT voltage range while staying below the 450Vdc PV Vmax and 18A PV Isc. Edited May 8, 2022 by Kilowatt Power Quote
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