Yellow Measure

Or buy another Sunsynk 8kW and give the free gift to one of us 😀😀😀😀

Remember we need feedback on the performance of the Solis S6 inverter and some pics once installed. Congratulations.

Hello Everyone, I am pulling this review out of the archives for good reason. It is now almost 3 years later, and my long-term experience with the Solis S6 Pro inverters has been nothing but a pleasure.
These machines are incredibly reliable and robust in every aspect. I have run my full household completely off-grid on these inverters. Previously I used a Sunsynk that simply could not handle the punishment in a true off-grid scenario.
On a single 6kW unit I have successfully run:
Electric lawnmowers, chainsaws, angle grinders
Oil bath & inverter welders
Borehole pumps, drills, impact hammer drills, circulation pumps
Base load of 6 fridges/freezers, air fryer, microwave, electric geyser 2kW element, CCTV 8 cameras, computers, TV, sound system, external LED lights
12,000 BTU aircon (winter and summer)
I regularly pushed the inverter to its limits and used the 200% surge capacity for short bursts. All of this with zero noise from the inverter.
Other successful tests:
Generator integration Grid and Aux port works flawlessly and allows precise throttling of generator power draw.
2kW wind turbine on MPPT (constant voltage mode) and AC-coupled on Aux/backup port. Solis even created a special firmware to improve charging range. Their strong grid-forming capability makes them compatible with sensitive wind grid-tied inverters where others fail.
Parallel operation: Added a second 6kW unit one dedicated to PV, one to wind.
One unit was damaged during extreme experimentation Solis promptly replaced it under warranty. Their after-sales, technical support, and swap-out policy is second to none.
The Micro-Grid capability is absolutely amazing.
Internal transfer losses are almost zero.
I am deep into the experiment right now and will soon be adding a Solis 4.6kW grid-tied inverter into the micro-grid for further testing of TOU functions, charge and discharge rates, etc.
Their new Energy Management System (EMS) soon to be fully AI-powered makes perfect sense for grid-connected systems, from residential all the way to commercial solutions. It lets users set up Peak, Normal, and Off-Peak rates linked to intelligent charge and discharge schedules.
This maximises financial returns by optimising when to charge from the grid or solar, when to discharge to the loads, and when to export.
The upcoming self-learning AI mode will take it even further by automatically predicting solar generation, learning your actual consumption patterns, and making real-time decisions with minimal user input a big step forward for effortless optimisation. Up to this point I can only applaud Solis for a true Tier 1 product in every aspect.
The ability to create a micro-grid with their Hybrid inverters opens up huge potential for users who have multiple houses or buildings on the same property, with distributed batteries, inverters, PV, generator, or wind power systems all running seamlessly together on the same micro-grid.
Firmware upgrades are mostly for new features and battery compatibility.
The system has been so stable I went over a year without updates at times true “install and forget” performance in normal use.
I am now running an 8kW Solis Pro as the grid-forming master for my 6kW Solis Pro using CT clamp from the 6kW on the 8kW backup output. Each has its own battery bank and power source.
I am also planning a formal review of the Solis 5kW Off-Grid models soon.
Strong note: these are currently the only off-grid inverters that are NRS certified. We will be asking Solis for some units to give away.
Highly recommended!

4 New Websites up
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Glo Solar is a scam https://glosolarsa.co.za
Glo Tech Energy is a scam https://glotechenergy.com

Indeed, but now we are comparing two totally different metrics 🙂 and yours has a whole lot more variables.
My best month this year was May, then again I have been off grid since December. But I also upgraded my battery bank in March, and started deeper cycling (and evening usage) in May.

Here are my Port Elizabeth weather station's graphs, for the year to date (1 Jan 2026 to 24 June 2026):

Ignoring the dip in March/ April and the spike in May (due to various comms issues), you can clearly see peaks of well over 1000W/sqm in January vs barely over 500W/sqm in June.

Here is a graph of the last 12 months (25 June 2025 to 24 June 2026):

So in my experience, with both coastal and inland installations, it is generally a drop of around 50%.

My 1st question would be what the cost of the 4 solid state relays are. 
Then I have to say good for you to come up with a own design. 
I have to agree with BRG on this one. While East is working full tilt the west string will still contribute handsomely if but we're just in parallel. As east start to dwindle after say 13h west will pick up well and continue to sunset. Overall I would expect production to be about 25-30% down compared to a North facing string with the same panels making up the east or west string. 
There is one condition that I can think of why this is an important and even an essential reason for the switch. With both strings in parallel the current from them might exceed the maximum input into the MTTP and the inverter should switch off. Now I hear a number of us saying no it will only cap the input. This is normally so but good designs should see a 1.7 or more times the maximum current as a no-no and protect itself by switching off. 
Still an interesting approach. 

I present my solution, in the circuit that you can see in the image, to be able to connect 2 Strings to a single MPPT input of any power inverter, in my case East string and West string with automatic switching at a time close to solar noon to the PV2 input of my inverter.
I have a Goodwe ES5048 inverter, for those who don't know, this almost 5Kw inverter has only 2 photovoltaic inputs (2 mppt) for 2 strings.
The idea arose a little over 2 (two) years ago when I wanted to expand the area of solar panels to increase my solar production but I found myself with the problem of not having more space in my house to install more panels to the North.
I was not interested in buying another inverter to have 2 more mppt, not only for a matter of physical space to install them, but because the Goodwe is not parallelizable with other equal ones and the fact of having to modify the electrical circuits of my house downstream of the inverters was a resounding "no" for me
I have very good roofs at home to the West and East, so I began to investigate if there was any commercial solution for this purpose and I did not find anything.
I designed this Circuit that I present to you now, but that I have been working at home since March 2021, exactly tested for 2 (two) years, working perfectly with the DC RELAY Values that appear in the photographs of the Real Board installed in my home. It has been tested in all temperatures and conditions.
Before March 2021 I tried other 40 amp relays but they got too hot and I was afraid they would burn out. That's why I bought these that are 150 Amps and with the suggested aluminum heatsinks, even in the middle of summer with temperatures of 40 degrees, the heat dissipated is not high.
It's a very simple circuit that anyone with an idea of elementary electronics/electricity can do.
I could comment much more about it, but I prefer that you ask the questions that may arise.
The relays and their heat sinks can be purchased on aliexpress. From 600 Volts DC they have up to 400 Amps.
The timer can be purchased at any electrical/electronics store for a DIN board. It only matters that you have a Normal Open contact and a Normal Closed contact.
The other thing that is needed is a low voltage DC source to open or close the relays, it can be from an old cell phone since it supports more than 5 Vdc.
Really for me it was a solution that I am very happy with. None of the relays have burned out in two years of use. with an investment of a few dollars, minimal compared to the benefit it brings.
The scheme is self-descriptive, so as not to lengthen this Post.
 
 

A belated Thank You to @Powerforum Store This clarifies it well
This is a very good price. Given that installation costs for the various systems should be fairly similar, it would be interesting to compare purchase price of the three systems (Solis 2x6kW vs Sungrow 10kW vs Sunsynk 12kW), especially when also comparing the variance in battery and PV capacity of the three systems (2 x 15.3kWh vs 1 x 10kWh vs 1 x 16kWh for the batteries and 11.04kWp vs 6.2kWp vs 7.2kWp for the PV)... That's a "no brainer" for me.

I am always very skeptical about cheap systems that promise things like "100% DoD", even if it is "warranted". In my opinion, and taking into account that one would expect an acceptable service for a period of 12-15 years, one should not settle for the cheapest install "just because it is the cheapest". Have you looked at the actual warranty requirements (specifications) from the manufacturer? Would daily discharging down to 100% DoD still give the "warranted" service life of industry standard 6000 cycles? What if the operating temperature was (say) 30 degrees, or even 40 degrees, as is common for many places in South Africa... What if your charging and/or discharging rate was (say) 0.5C or 1.0C (here, "C" is not temperature, but current ratio, with 1.0C being your battery's rated nominal current capacity (~100A for a 5kWh battery...)?
The old Afrikaans saying "Goedkoop koop is duur koop" is very true when it comes to solar... have a look at this recent thread: https://powerforum.co.za/topic/34086-lfp-and-other-lithium-facts/

Hello Hennie
The Pro Models are the first line of S6 Hybrid inverters they do not have display screens on the inverter and use Bluetooth, Lan and WIFI via the Solis Cloud app for config and setup these are the 3.6, 5, 6 and 8 KW LV Models. All HV models have display screens. They also have the very wide range MPPT units that start producing at 90VDC and has a maximum voltage of 600VDC.
As an example the 6 KW Unit for the pro model can produce 9.6 KW PV on its two MPPT's
They all have an IP66 Rating and has all the feature sets like AFCI 200% Load for 10 Seconds 4ms changeover AC Coupling Generator integration on AUX port or grid with signal and auto start and they truly blend power like Victron and a lot more.
They all come with a standard 10 year warranty.
The newer Solis Plus Models have large display screens on the front of the inverters for the 5, 6, and 8 KW Solis introduced the screens due to user demand they still have Bluetooth Lan and WIFI.
They also have all the feature sets like the older model with some extras like the large display their MPPT's wake up at 89VDC and produce at 90VDC but is limited to 500VDC however their PV capacity is 200% of the inverter rating so the 6 KW Unit can produce 12KW from its two MPPT's
These models all come standard with a 10 year Warranty 5, 6 and 8 KW units however the larger LV models 12 14 16 KW units have a standard 5 Year warranty with a warranty extension option up to 25 years (to be confirmed) the 10 year extension is available some distributors sell these models with the extended 10 year warranty included but there will be a marked price difference so be aware of that when buying the larger models this also applies to the HV Models standard 5 Year warranty with some Distributors selling 10 year warranty models.
We try to sell mainly 10 year warranty models we constantly have to check the prices to ensure the model we are selling is 10 Year if not we will let the buyer decide if he wants a 5 Year or 10 Year warranty machine.
Important point on the Solis Warranty is that its a Swap out warranty and NOT a repair warranty. Their turnaround time is fast and efficient with no unnecessary delays.
As a Comparison Currently have a client with a Sunsynk inverter where the inverter was sent back for warranty repair its now 1 month and 2 weeks and we still have no feedback on if the inverter will be repaired under warranty or not needless to say the client is freaking out.
All of the Solis inverters are NRS097 Approved and Solis Brand is a Tier 1 Inverter brand Sunsynk / Deye for example are Tier 2 Inverter brands.
We just recently sold a system to a client that included 2 x 6 KW solis pro Inverters 24 x 460 Watt JA Solar Bi Facial panels with roof mountings and 2 x 15.3 KW Active BMS batteries and all the cable and required accessories for around R113 000 EX Vat and that included delivery to his doorstep. In my opinion that is a very robust system at a very reasonable price.

Hi there and welcome to Powerforum! Great first post with solid details on your 15–20 kWh daily usage, 5.9 kW peak, north-facing unshaded roof, and R150k target. You're in a strong position for excellent energy independence in Joburg.Recommended Setup Optimised for Your Needs.
Inverter: Solis LV Hybrid 8 kW (highly recommended) or 12 kW if you want extra headroom.
Battery: Kynee 15.3 kWh or 2× for ~30 kWh total the price jump is often small and worth it for extra autonomy.
Panels: 12–14 × 550–650 W Tier 1 bifacial (JA Solar, Trina, Longi with BC tech, or Canadian Solar) for a ~7–9 kW array. Your unshaded north-facing roof is perfect use multiple MPPTs e.g., 2 strings north + 1 east for maximum yield.
This setup should cover your modest usage comfortably on sunny days and during loadshedding, with room to expand.
Maximising Efficiency Tip: Slightly oversize the PV array and swap your geyser element to 2 kW. This lets excess daytime solar run the geyser far more effectively.
Total installed cost: Realistic R130k–R150k fully done cabling, DBs, CoC, etc.
Why Solis is the Superior Choice While many members recommend Sunsynk or Deye mainly because they’re very familiar with those products, the Solis LV Hybrid is far superior in almost every practical aspect for a residential install like yours:
BloombergNEF Tier 1 manufacturer top global ranking with proven bankability, stronger reliability, and better support for banks/insurers/property value.
Standard 10-year warranty on the LV 5/6/8 kW models.
Advanced power blending similar to Victron seamlessly mixes PV, battery, and grid power.
Generator integration on either utility or backup port with auto-start.
AC coupling support with frequency shifting for easy future expansion.
Impressive overload capability runs 200% load for 10 seconds.
Ultra-fast 4 ms changeover time.
Superior MPPTs support larger arrays, lower startup and production voltage, wider voltage range, and built-in Arc Fault Detection (AFD). If an arc is detected, the inverter automatically switches off the affected MPPT to prevent fires.
Better compatibility with modern panels: Deye and Sunsynk have known limitations with larger capacity / higher current modules (maximum amps per string), which can damage their MPPTs. Many installers are not fully aware of this risk. Solis handles the latest high-power bifacial panels without issue.
Newer panels are almost all bifacial (some with BC tech like Longi), offering higher efficiency, easier cleaning and maintenance, and greater rigidity thanks to the double-glass configuration.
All of this comes at a noticeably better price point while delivering premium performance.
Battery Choice & RedundancyKynee 15.3 kWh (Chilwee Group) LFP chemistry with a true active smart BMS one of the few in SA with active balancing.
Decent quality batteries like the Kynee with active BMS are far less likely to fail than older or passive-BMS models. The active balancing keeps cells in perfect health, significantly reducing the risk of issues that could lead to failure.
That said, your point about redundancy is valid having two batteries does give you peace of mind: if one were to have a problem, the system would still run on the remaining battery instead of going completely dark. Many members go the 2×15.3 kWh route for exactly this reason, especially since the incremental cost is reasonable and you gain a lot more daily autonomy as well.
Active vs Passive BMS: Most Deye/Sunsynk-paired batteries use passive BMS bleed excess energy as heat slower and less efficient. Kynee’s active BMS transfers energy between cells for faster, cooler, more efficient balancing, better health, and longer lifespan.
Mixing batteries: Not recommended different sizes cause BMS issues, uneven cell/bank balancing, and potential problems.
Stick to identical units.Warranty/Support Edge: Kynee offers 48-hour swap-out turnaround a massive advantage over the long repair waits common with many other brands including Sunsynk/Deye setups
.Your Technical Questions Essential vs Non-Essential Loads
Non-essentials can still use excess solar during the day via CT control ideal for your geyser. They drop during loadshedding, while essentials stay on inverter + battery.Next Steps & Installers Prioritise PV GreenCard accredited installers experienced with Solis in the northern suburbs.
The Powerforum Store stocks Solis, Kynee, and the latest Tier 1 bifacial panels at competitive prices and can recommend reliable, trusted installers we work with regularly.
You’re welcome to contact [email protected] and ask for Steve or Wimpie they’ll be happy to put together a full package quote single or dual battery options and suggest suitable installers for your area.
Post your roof photos, latest bill, or any quotes here and we can fine-tune further.
This Solis + Kynee setup delivers Tier 1 quality, advanced safety features, active BMS benefits, fast support, and strong independence all within your budget.
Looking forward to helping you get this sorted! Any questions, just ask.

Just want to give a huge shout out to @Leshen and his team for an amazing experience. The recommendations and reputation did not disappoint. Great person to deal with :) Everything done in pretty much a day and working instantly.

12Kw Sunsynk inverter
16kwh Sunsynk battery
12 x 620w panels
Pic:
https://ibb.co/TMnGvdRb

So true,
Also running an off grid system. My winter production is always higher than summer. If I were to max out the potential in summer with a constant load, then the summer numbers would be higher too.
The week between 15 to 22Jun was particularly low due to the cloud cover mostly, with last Sunday being my lowest ever for one day at just over 4kW from the panels for the whole day.
This is what my last 12months looked like.




and the sudden drop in production from 15 to 22Jun is clearly visible in the "last 30 days" graph.

Thanks, much appreciated!
I've scrolled through the Solar Assistant data. In the summer, the amps are definitely getting clipped. But now in winter, it's struggling to reach 10 amps on MPPT 2 and 7 amps on MPPT 1.

This is the highest I've seen the voltage jump when there's little to no load on the inverter.

To give you better context, I'm in Mossel Bay, about 80m above sea level and 1.3km as the crow flies from the ocean. We definitely don't see minus temps, but it can drop into the single digits.
Since sub-zero isn't a factor here, it sounds like pushing to 7 panels per string (7E/7W) will keep me safely inside that 500V MPPT limit.
Ground mounting won't work on my property, but that microinverter setup on the Aux port is a very cool idea! Thanks again for the detailed breakdown.
Installation for 2 pannels is scheduled for Wednesday.

In Gauteng my install of just over 6000kWp is at a 26 degree angle, and about 5 degrees off true North, and I have noticed quite a drop-off this winter, possibly due to poor air quality. That is over and above the cloudy weather that we have experienced in Gauteng.
It is confirmed by my weather station, which measures W/square meter, here is the graph for the year to date (1 Jan 2026 to 24 June 2026):

In January I was regularly getting peaks of over 1000W/sqm (even 1171 in February), this has now dropped to my best peak in June at 576W/sqm.
Here is a graph of the last 12 months (25 June 2025 to 24 June 2026):

So yes, it's is quite a significant drop-off from Summer to Winter.

Here are my Port Elizabeth weather station's graphs, for the year to date (1 Jan 2026 to 24 June 2026):

Ignoring the dip in March/ April and the spike in May (due to various comms issues), you can clearly see peaks of well over 1000W/sqm in January vs barely over 500W/sqm in June.

Here is a graph of the last 12 months (25 June 2025 to 24 June 2026):

So in my experience, with both coastal and inland installations, it is generally a drop of around 50%.

Indeed, but now we are comparing two totally different metrics 🙂 and yours has a whole lot more variables.
My best month this year was May, then again I have been off grid since December. But I also upgraded my battery bank in March, and started deeper cycling (and evening usage) in May.

I concur - there's just too many variables to be able to compare one system with another - even in the same town... I generally only use about 50% - 60% of my system's capacity, and that alone will skew my PV harvest, as my (lack of) consumption would limit what the panels can produce... Still, nice to compare figures as long as it's not taken too seriously 😉

it should make a difference, how noticeable, is tough to predict, if there is no partial shading on either of the strings, when they should be producing energy, it should be worthwhile, I'd say
the inverter should throttle the power back to what it is able to consume/charge the batteries
the more important one is the strings Voc, which should be ok, I think, just a hair under 50Voc per panel * 7 = 350Voc per string, which, I believe, the Sunsynk would be ok with, maybe double check this, I don't have a Sunsynk here anymore...

Hubble batteries are great, and I am most grateful for the Powerforumstore's recommendation at the time. I have 3x AM2s in parallel since March 2022, still going strong at 103% SOH. Not bad for over 4 years, 871 to 986 cycles, cycled daily and not a days' worth of trouble. 😎

If you can DIY....
UNI-T UT673PV Solar MPPT Meter
UT673PV Solar MPPT Meter,Miscellaneou,Environmental Testers
Isolate all PV from your system and disconnect each panel for testing early morning before voltages of panels rise.
Just remember, this tester is for testing ONE panel at a time.

Winter solstice was just 3 days ago, so ja, poor power generation is still basically the worst right now that it will be all year. But the 1000W on a panel set of 4360W sounds like too little. What's the Voltage and Current on PV2? Around 250V and 4A? Do you generate any more on PV2 if the PV1 string is disconnected? Do you have any problems with shade being cast over that 2nd string?

Hello Everyone Just received the Hubble AM16+ and the AM5+ will unbox them this weekend share pics of what's in the boxes. I can however say both batteries are really Heavy already a good sign the AM5+ is almost 60KG and the AM16+ cardboard box almost 160KG wooden crate packaging included... all came on a pallet.
I will need extra hands to move that beast into place the good news is that it has wheels.
Exciting stuff will get some feedback from the Hubble engineer on how to make 3 Cloudlinks talk to each other considering the batteries have their own built in units.
Also get the new batteries to talk to the old AM2 Units...
Then I will start playing around with the batteries and get some meaningful testing done may even be able to share live viewing access to the two cloudlinks with links here on the forum.
Will keep you posted this weekend is unboxing and installing.

Hello Powerforum members,
Hubble Energy will be sending me one Hubble Energy AM16+ (16.1kWh) and one AM5+ (5.12kWh) for extended real-world testing and review.

These are part of their current LV Range which includes:
AM-2 – Popular 5.5kWh 51V NMC battery 1C rating, proven long-term performer.
AM-4 – Compact 2.56–2.75kWh 25.6V wall-mount battery with 1C rating.
AM-5+ – 5.12kWh 51.2V LFP with built-in Cloudlink, 1C rating and RGB display.
AM10+ – Larger 10kWh+ model in the + series with advanced features.
AM16+ – High-capacity 16.1kWh floor-standing LFP with wheels, built-in Cloudlink and high discharge capability.
S-100A – 12V 100Ah (1.2kWh) compact lithium battery.
X-5+ (New X-101) – Newer generation Rack Mounted 5.5kWh model with updated features.
X-101 – Established Rack Mounted 5.5kWh 51V model, widely used in hybrid systems.
Note:
Hubble Energy also has a very exciting HV Range, but this review will focus 100% on the LV Range especially for members who already own Hubble batteries or are considering them.
Hubble Energy will also soon release the new AM-2+, which keeps the same NMC technology as the existing AM-2 models but adds built-in Cloudlink and several extra features.

My Setup:
Main system: Solis S6 8kW Pro Hybrid (master) with a Solis S6 6kW Pro seeing the 8kW as “grid”
AC-coupled: Enphase micro-inverters + Solis S5 4.6kW grid-tied inverter on the Aux port of the 8kW
2kW Wind turbine on the Solis S6 6kW MPPT in constant voltage mode
Separate Solis 5kW Off-Grid inverter for additional testing
Existing battery bank: 7 × Hubble AM2 (mixed ages – oldest >5 years old)
AM2 cycle counts right now:
1411 | 1036 | 880 | 853 | 805 | 737 | 595 cycles Total bank health still at 99% – very impressive for the age mix.
What I’ll be Testing:
Daily cycling and performance of the AM16+ and AM5+ on the Solis S6 6kW and the 5kW Off-Grid inverter
Parallel operation between the new + series and my existing AM2 bank (old model compatibility is a big claim)
Mixing different aged AM2 batteries and different capacities with the new units
Compatibility with multiple inverter brands/configurations
Cross-brand testing – insider info from a senior Hubble engineer says the new Plus range can work with almost any other battery brand
Full use of the built-in Hubble Cloudlink (I have unit #388)
I’ll also be highlighting the exciting new ergonomic and safety features:
Wheels on the AM16+ for easy movement
Magnetic panels that neatly hide all internal cables
Front-accessible BMS and critical components for simpler maintenance
Active cooling, fire suppression, and more
The unlimited cycle warranty on these new models is particularly attractive and will be closely monitored during long-term testing.I’ll be doing a detailed initial short-term review followed by ongoing long-term data over the coming months.
Expect real numbers on efficiency, temperature performance, charge/discharge behaviour, Cloudlink functionality, noise, installation, display readability, and real-world interaction with wind + AC-coupled solar.
We will also speak nicely to Hubble Energy and ask if they can provide some products for a lucky draw / giveaway for Powerforum members.
If you have any testing requests (particular charge profiles, high-load scenarios, Cloudlink screenshots, parallel comms behaviour, etc.), please reply in this thread. I’ll try to cover as many as possible.
Product links:
AM5+

AM16+

This should be a very thorough and transparent review for the Hubble community.
Looking forward to sharing the results with everyone.
Cheers, @Powerforum Store

Hubble Energy AM5+ Brochure V1.2.pdf Hubble Energy AM16+ Brochure V2.3.pdf