abd7

Remember when these were bought a few years ago they were bought with 10year warranties.
The bms was supposed to manage the events you are talking about. Blaming the customer for a junk bms by saying you have a few high voltage charges is bs
I had 3 us3000. After 4 years they swelled. I had warranty rejected because of high voltage events 3 years prior.
I will never touch the brand again and will point the middle finger at them every chance I get. Crap brand

All I can say is....'once bitten, twice shy" Thank you but NO THANK YOU. If this gets me banned from the forum, so be it. UP5000 battery which I paid R25000,00 for swollen after 3 years and I have been waiting 5 months just for an answer after handing it in. It"s starting to feel like someone stole R25k from me.

The windows example is not correct. Deye makes the Sunsynk inverter. Deye makes their firmware for them as well. The deye team do the firmware updates for Sunsynk inverters too. Lol. So the functionality of the inverter is exactly the same.
Their websites and apps differ though. The new deye cloud website is different to Sunsynk but just as good as Sunsynks. The apps are different but eventually the same functionality. Again, the new deye cloud app is decent enough.
They are essentially the same thing, just depends on the local support available and the price. Buy whichever of the two, they are the same thing.

Even if the south facing panels provide zero PV the quoted 5.4kW PV from the 23 panels seems lowish.
More data like angle, size of panels, SOC of batteries, load used and area of installation is needed to get an estimated closer answer.

Power ≠ Voltage cloud edge effect mainly increases irradiance ,current (Imp), not voltage (Voc).
MPPT voltage limit risk is driven by cold temperature, not cloud reflection.
Your real danger condition is:
Low temperature (e.g. <-5°C )
High Voc string design near Mppt max. Cloud edge is not the primary cause of overvoltage damage.
Cold Voc design margins = primary concern.
The real design rule (this is the key point)
If you're designing strings: Voltage safety (critical). Always base on cold Voc worst-case, use panel Voc at STC, apply temperature coefficient calculate at minimum expected temperature (e.g. -5°C in SA highveld)
This is what protects your MPPT.

'Winner Pro' ups, branded RCT, Mecer etc, are manufactured by Voltronics. That's not a bad thing, it's good to know the manufacturers are on that level
https://voltronicpower.com/en-US/Product/Detail/Winner-Pro-1KVA-10KVA

I have a 1kva equivalent and going strong years later. They are all very similar, voltronics rebrands from the looks of it.
Note the dimensions of the 3kva, it's quite deep, won't fit in a wall mounted network rack.

We have handled warranty claims and returns across thousands of inverters from various brands, including Deye, Sunsynk, Kodak, Solis, Goodwe, Ates, GivEnergy, Victron, Megarevo, and others.
In our experience, Solis has often provided straightforward and prompt resolutions, such as swapping out units for replacement even in cases involving external factors like surges, incorrect phase rotation, or earthing issues with relatively quick turnaround.
There are cases where escalated or demanding interactions from installers or consumers can lead to more reluctance from support teams, particularly if the issue traces to installation faults or misuse.
We frequently see battery related issues firmware mismatches or configuration errors initially blamed on the inverter. In most such cases we've encountered, the root cause was battery side BMS dictating settings and errors, as the BMS controls communication in modern hybrid systems not the inverter. This applies across many quality brands.
That said, other brands like Deye and Sunsynk have made noticeable improvements to their support in recent times, which is positive to see.
There have been cases with longer waits several months, even up to a year for some Sunsynk repairs in the past, and occasional instances where units returned unfixed, but these vary by situation and have improved for many users.
The main point I'd like to illustrate is that genuine inverter hardware failures appear to be very rare across quality brands like these most reported problems trace back to installation related issues and consumer misuse rather than the products themselves.
For example, we supplied a client with three Solis 8kW inverters for a remote farm setup.
The original installer experienced mainly with another brand encountered ongoing issues.
Phantom grid loads, erratic PV production, uneven battery charging, and more. Despite multiple checks by electricians and significant time and money spent, the problems persisted.
The installer suggested returning the Solis units in favor of their preferred brand.
Solis responded supportively by providing three replacement inverters at their cost, while the originals remained in place for testing, new CT clamps, and WiFi dongles to rule out accessory faults. Notably, in this case and consistent with what we've seen in other Solis claims they sent the replacements to the client before receiving the original units back, which helped minimize downtime for the end user even though the originals turned out not to be faulty after full investigation.
This escalated significantly for the client including threats of legal action against us and Solis for supplying faulty equipment.
When we got involved directly and arranged for an experienced Solis installer to review the site, several installation issues came to light.
Incorrect string configuration at the combiner boxes attempting to parallel panels improperly over 50m distance.
No earthing clips or proper earthing between panels.
Combiner boxes with only Type 2 SPDs and underrated fuses in a high-lightning area, Type 1 SPDs are typically recommended.
Permanent earth neutral bond on the inverter output despite Solis having built in relays for this.
No dedicated earthing at panels relying solely on the steel shed structure in concrete.
No common earth cable linking panels to the overall system.
Makeshift BMS cable extension using taped Cat5 wires.
Battery wiring without a proper bus bar from master to the three inverters.
Inverters and batteries not earthed at chassis level.
CT clamps initially placed incorrectly later extended with thin, unsuitable cable instead of proper Modbus rated wire.
Once these were corrected and the last firmware update on the system was performed at that time by the experienced Solis installer the system has run reliably for nearly two years as of now, with additional batteries and panels added successfully.
It now powers the full farmstead, including geysers, borehole pumps, hatchery, and staff quarters, without issues and operates 99% off grid.
They've had multiple lightning strikes that knocked out the grid and damaged the transformer on the farm.
The system was unaffected however, the farmer ensured insurance coverage specifically for the high lightning and hail risks in the area.
This case highlights what we've seen repeatedly the vast majority of solar system problems easily the overwhelming share in our experience relate to installation practices, component compatibility, site specific factors like inadequate surge protection and earthing, or consumer misuse and lack of understanding rather than inherent inverter defects.
Proper setup, following manufacturer guidelines including ensuring firmware is up to date after significant changes, and using experienced installers familiar with the brand, makes a huge difference regardless of whether it's Solis, Deye, or another solid option.
Both Solis and Deye including rebrands like Sunsynk are capable products with strong followings in SA choice often comes down to specific features, battery compatibility, local support availability, and installer/consumer preference.
The fact that Deye and Sunsynk often handle repairs even on surge damaged units is helpful for those without insurance.
However, inverters represent only a small portion of total system cost solar panels damaged by lightning, hail and storms or batteries affected by surges don't enjoy the same repair advantages.

Software, if you talking about the app and Web application, yes that's Sunsynk developed.
No way Deye learnt any firmware features from Sunsynk. Lol.
I've had the Deye support team even load a Sunsynk firmware for me onto a Deye inverter to test doing a firmware update with a Sunsynk dongle (where the deye dongle wasn't working). Go figure.

There's a bit of misinformation here.
Deye and Sunsynk functionality is exactly the same. Sunsynk is a rebranded deye. It's impossible that the Sunsynk will be more efficient in its feeding non essentials than the deye.

That's not due to the inverter.
If it was an issue, it's due to the install or user error.
Possibly CT cable was too long or the like. Or shielded cable was not used to extend. When over a certain length then 3rd party energy meters need to be used, RS485

Secondly, the Deye cloud app is much improved and even better than the Sunsynk app in my opinion.

That BMS counts the cycle according to how they define it

It is there.
Look under the live text data tab.
Then select advanced parameters at the bottom.

Fair enough the essential loads switch is pretty standard in all inverter installation and is actually meant as a bypass switch when your inverter goes offline( damaged, servicing) so that you are not stuck with no power on your essential loads side. But surely can be used at your discretion whether you want to use the inverter or utility feed.
This is where the plot thickens and where you need to be very careful.
The moment you start using two manual bypass switches to move loads between Eskom (utility input) and the inverter output across two different DBs, you introduce a serious risk.
If the switching sequence is wrong, you can unintentionally create a back-feed path from Eskom straight into the inverter output. That’s exactly why essential and non-essential DBs are normally isolated in the first place.
Here’s the risk explained simply:
Your essential DB bypass switch normally sits in inverter mode
(inverter feeds the loads, Eskom isolated).
You only flip it to Eskom when servicing the inverter or forcing utility takeover.
Now you add a second manual bypass on the non-essential DB between Eskom and inverter output. If you unknowingly leave essential DB bypass on Eskom, and
Non-essential DB switched to inverter output you’ve just created a direct path from Eskom into the inverter output. That’s how inverters get destroyed.
There are only TWO safe and viable options:
1. Move the required loads from the non-essential DB to the essential DB
Simple, safe, no extra switching logic, no risk of back-feed.
2. Keep the essential DB bypass as-is and use an AUTOMATIC transfer switch (ATS) on the non-essential DB Eskom is wired as primary. Inverter output as secondary
The ATS only changes over when Eskom fails. No possible feedback path between inverter input and output
Important:
Your inverter must be capable of carrying the full connected load in inverter mode when Eskom drops.

https://cs.jinkosolar.com/app/index.html#/customer-complaint/authenticity
Put your panels serial numbers through this verification just to be sure

https://cs.jinkosolar.com/app/index.html#/customer-complaint/authenticity
Put your panels serial numbers through this verification just to be sure

Jinko panels (genuine ones) are tier 1 and perform just as well as any other brand.
We have the Jinko 615w producing full 615w power without any issues on other sites.

I would verify the authenticity panels with Jinko directly, they should have a serial number verification process to check the panels are genuine.
Once that's confirmed, it's probably the inverter that's causing the limit due to the settings / setup.
You should get near the full power rating of the panels on a good day, not 50%. Bifacial rating would be over and above the 615w, so that doesn't change anything. Noct as per specsheet is normal. On a bright summers day, production will be more than that.

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You can disable the schedule entries (timer) individually and the schedule won't run.

You should get the Voc value of your exact solar panel model, multiply that by the number of panels in the string, that will give you the max voltage you could see on the inverter in any situation.
The installer shouldn't have to test install and then decide it's too high etc. Nevertheless it was a good decision not to have 10 panels, that looks too close to the max of 500v. 8 or maybe 9 panels may probably be fine, but we need the voc value of your panels to decide that.
Point to note, with a east / West split, your peak power will be less but your panels will work well early morning and afternoon. So a more accurate comparison would be to compare the kwh generated for the entire day. Compare the two setups.
I would leave the east and west panels (since they are already installed) and add another to the north facing, voc dependant.

Thanks for the reply.
I don't see any 'bus voltage' graph on this site in solar assistant. Unfortunately. Doesn't seem to have it on this 8kw nor on a 16kw I checked.
Yeah the battery was always full when it happened x 2 occasions, with a bright sunny day.
I've got the battery settings running with voltage control now and the voltages seem much more stable on the battery now.
See before and after attached. Dyness BMS didn't seem to be doing a good job with those voltages at all.
Can't have the site doing this, so maybe I should limit the grid export a bit as well to try and avoid this fault?
Nevertheless I will monitor.

Before :




After setting inverter onto voltage control mode:

@abd7 Yes looks much better on the 2nd set of graphs. In the first graph the voltage spikes is well above safety limits for lifep04 the battery was subjected to dangerous cell overvoltage at >3.68v/cell and most probably went into overvoltage discconect.(OVD) and when that happens the bus voltage rises until the inverter goes into protection mode F55.

Here are my strings at 06h15 this morning PV1=1630W and PV2=1350W. Even with the lower voltage of string 2 they both generated 0.3A and 50W.
Deye 5 kW. PV2 made up of 4 panels.