That's not what I mean... I'm talking about FIRMWARE changes not USER adjustments.
My experience is the EG4 units are sent out to customers. Once problems are identified, they will come out with a firmware update to try and fix those problems. Doesn't matter which unit, every unit seems to require a firmware update after release to the public, sometimes it is multiple firmware updates.
Sometimes it fixes the problem, other times it makes it worse. Meanwhile, the end user deals with the fallout.
Interesting anecdote, originally I purchased a pair of MPP LV6548's but did not install the units. I decided I wanted higher VOC voltage and purchased a pair of EG4 6500EX's. Each firmware update I did made the problems worse. If you look on my Youtube channel you will see the scope recordings of these units. EG4 agreed to RMA the units and I had to send the units back and once they received my original units, they would send replacements. I installed the LV6548's while I waited for replacements. I sent the units back and had UPS notify me when the units hit the EG4 doorstep.
The LV6548's worked perfect. I was limited on the VOC and could only use 1/2 of my array. 3 weeks went by after EG4 received the units. Not a single word from them. I finally had to privately message an employee thru this forum to see why I never was shipped anything back. It was only then they sent replacements. A few days later the units arrived, I installed them and had ground voltage issues. Did the firmware updates, still was seeing some problems. At night, the lights were flickering, I went down to take some measurements, nothing conclusive and I decided I would look at it again the next day. Upon turning off the basement lights. the lights would glow with the light switch off. WTF?
I had enough, I flipped the manual transfer switch back to grid power. The next day, I pulled the EG4's back off the wall and installed the LV6548's back in. They have worked flawlessly. And still have the original firmware installed.
What is the difference between the 2 units? Good question as the 6500EX was made by Voltronic and the LV6548's are also. It reminds me of Walmart selling tires, Walmart goes to a supplier, tells the supplier what they are willing to pay per tire and it is a take it or leave it proposal. So the supplier runs the numbers, figures they can fudge some things here and there and be able to make a profit on the tire at the low price offered. In other words, corners get cut to get a lower priced product. The only company that can purchase that tire made to those specs is Walmart. Is this what happened with the 6500EX? Possibly, there are some differences such as VOC rating so not all components are the same. Firmware is different too.
Whether you want to be the end user in such a scenario is your decision. I can tell you there are more parts to my story. In all, I spent about 100 hours looking for a cause of the problems I experienced along with some more money out of my pocket trying to eliminate any possible cause. Yet, installing a different inverter with no other changes I did not experience those problems. Be aware the firmware updates to the 18Kpv unit are not done yet, it still is a work in progress, just like other products sold.