Jopie

Good day, sorry for high jacking this topic, actually looking for a place to buy more of these cells. I found out that there is a L600 second generation of these at 196Ah. And exactly the same size... I build a few of these 16S batteries, I think they turned out okay? Please comment

Hi, could anyone please assist with the correct pinout for the solarman stick (DB9)? Apparently it has RS232, RS485 and some other connections available. Below I have a photo of the pinouts I've gathered up to now, but the pinout in yellow is incorrect as I tried it and it did not work. Would like to try it on a Voltronic inverter. Thanks

If you need to charge batteries with solar and utility simultaneously, use option 1 - USB and option 16 - SNU. I just tested it, it works.

SBU takes care of back feeding issues.

Good day I accidently figured out what to do the get the batteries charged....... Turns out USB setting must be used on the MAX inverters. USB setting on the MAX is the same thing as SUB on the VMiii. 2 nights ago I switched over from battery mode (SBU) to utility (SUB) as I planned to use the aircon and don't want it running from the batteries. I accidently put it on USB instead of SUB. The next morning it charged the battery as "first priority". The MAX is perfect, just a little feeding back to the grid, but I can live with that. Overall I'm very happy now

Good day I accidently figured out what to do the get the batteries charged....... Turns out USB setting must be used on the MAX inverters. USB setting on the MAX is the same thing as SUB on the VMiii. 2 nights ago I switched over from battery mode (SBU) to utility (SUB) as I planned to use the aircon and don't want it running from the batteries. I accidently put it on USB instead of SUB. The next morning it charged the battery as "first priority". The MAX is perfect, just a little feeding back to the grid, but I can live with that. Overall I'm very happy now

Good day Bad news again with the 7.2kW MAX... Seems like all 3 versions of software does the same thing, no charging of the batteries in cloudy conditions and it feeds back when the sun comes out... Below I attached a screenshot, orange is load, green solar, red grid. Around 12:30 the geyser switched off and then it pumped 800W back to the grid, luckily I saw this and switched it back to SBU mode... Same thing just before 16:00, I switched it to SUB and immediately it fed back to the grid, switched back to SBU again... The bottom graph shows battery charged nicely (SBU mode) until the geyser switched on at 10:00. At about 10:20 I switched it to SUB which worked as it should (red line) until it switched off as per above. But one can also see that no charging happened while the load was more than what the PV could provide. It's a pity it doesn't read the battery current, that's why "battery watts" and "Current" is zero. Today is very cloudy again, I'll be brave and leave it on SUB for the next 24 hours and have a look at those graphs again

Good day I managed to flash 12.13 and 90.28 just now... I was very happy at first to see that it charged the battery in SUB mode, until the AC kicked on again... Then it draws 0.5A I'll see if it feeds back to the grid tomorrow and report back... But at this moment it seems like the same problem still exists... No charging of the batteries in SUB mode no matter what charge settings are used if there is insufficient solar power... Tomorrow my new batteries arrive then I'll have 16x 105Ah deep cycles, should be enough to just keep it in SBU mode permanently... It's just those cloudy days that worries me a bit... I usually would put it on SUB mode before I leave for work on the old VMiii, then I knew my batteries would be fully charged and access solar would not be wasted. Thanks for all your help @Dirkie and @Coulomb PS Still no feedback from supplier wrt their firmware yet, I'll post here if they send it

Thank you very much, I'll give it a try

Thanks Coulomb for the detailed explanation. I have tested 90.19 on Sunday, did not charge batteries in SUB mode, same as original 45.07 I bought the inverter with... I'm still waiting for firmware from supplier, I think they "ignore" me due to my last email to them I stated that the inverter was bricked @DirkieIf they don't come to the party, where can I find this beautiful 90.28?

@CoulombTurns out, it was no bad news at all... I found an old desktop PC in the attic with an actual COM port. Still had XP loaded on it, just needed a power supply and voila, it worked. Inverter is up and running again I loaded 90.19 and 12.06. First thing I noticed was it constantly back fed approx 200 watts.... So I just tripped the inverter's supply. No running smoothly from sun/batteries. Today is the first day in a couple of weeks where we have no clouds I will wait and see what version the supplier can offer me, and I'll post feedback here. Moral of the story... Never get rid of old computers, they might be handy in the future.

Exact same thing happened to me... I had a RCT VMiii 5kVA inverter, on SUB setting it would be in bypass mode. One could call it "grid-tie" with "zero export" in Deye terms... But it would first send all solar to batteries and once charged up, "send" solar to "assist" loads... Something like that. I usually would set it to SUB on a cloudy day, knowing that the batteries would definitely be fully charged for night use and excess sun power would not be wasted... Now I bought a Synapse 7.2M+, it's also a Voltronic Axpert MAX 7.2. Could not get it to charge the batteries on a cloudy day while loads were present. Tried all charge settings and all output settings, none worked unless load were less than what the sun could provide. Please don't reflash anything yet, I currently have a 20kg brick mounted to the wall. I'm waiting for new firmware from the supplier, I've also ordered the Mecer branded RS232 converter from Takealot. My brainbox brand might be at fault (I hope). RS232 converter will arrive on Tuesday. I'll let you know if I got it working properly.

Thanks, I surely hope it is not that bad, I only bought it less than a month ago I'll see what the supplier has to say, they sent me firmware via email, but can't open it.... I'll update once something good happens Thanks

Good day I had a problem today with the MAX 7.2kW where it didn't want to charge the batteries at all. It was a very cloudy day, so I changed it to SUB mode with the hope that it will charge the batteries as "first priority" (like my old VMiii did). After no success with that, I changed the "solar only" charging to both other options but still it would only charge when there were excess sunlight (load was first priority) So I did the right thing and attempted to load new firmware, by far the best decision this year.... (only 6 days at least).... Original firmware taken down before disaster strike: U1: 45.07, U2: 12.13, U3: 00.00 (don't know what this U3 is for). After turning the inverter into a brick, I eventually got 12.03 flashed and then the screen came on at least. But trying to get 45.04 or 90.19 loaded doesn't work at all. I've tried through the coms cable and via USB stick, no luck. When I power it up, it just goes through the normal countdown 6,5,4,4,3,2,1 and the 32 flashes. Tried with batteries only and AC only, makes no difference... It "writes" 2 blocks and stops as per attached photo. Also, with the old (working) firmware, I did notice that it backfed into the grid on SUB setting... Another reason why I though it would be brilliant to load newer firmware. Any help would be much appreciated