fvanz

Hey guys Thanks a million! I had the same experience with my 48V VMIII tonight. Updated main FW to 41.17 as per link in another thread on this forum, but display was not working after the update. Tried what jarjarbeens said with no success initially. I Just kept trying and trying and FINALLY got communication between the flashing tool and the inverter after about 20 attempts, trying different sequences. When I powered the inverter on after the Main FW update, you could hear relays clicking with the fans on. The fans would go off after a few seconds, with some relay clicking that followed. I followed what Jajarbeens posted above. The only thing I can add is that the power button needs to be IN (on) on the removable display. I got success when I pressed "Update MCU" on the flash tool about 3-4 seconds after I switched the AC power to the inverter on, just before the fans stopped. I figure that would before the normal starting 6 second countdown elapsed. Took about 20 seconds and then the flash started. Whole flash took 9 minutes and the display came on immediately after the flash completed. Restarted the inverter and confirmed that the Main FW was indeed 41.17, and the MCU version is 02.66 (that coulomb provided). Once again thank you for all the generous information on this forum.

Ok thank you. Just wondering why it uses 80W at times? Maybe fans? It can draw 800W during the course of the night, that's almost 20% of my storage! (2x US2000 Pylons).

On this graph you can see the constant slow decrease of Volts, SOC and a constant -2Amp draw. (At the yellow dot I just commanded to charge from AC for monitoring.)

Evening to all. I have noticed something strange on my inverter setup. Setup is Axpert VMIII 5KV , 2x Pylon 2000 and 2000W PV (for now). So, whenever the batteries are not being charged, by any means when SOC is 25 or 100%, there is a 30w - 90w discharge from the batteries. ICC shows 0.4A - 1.8A battery disharge, even running from Utility. Any ideas please?

@Coulomb Thank you!. Can you please tell me what the cooling fans behavior is with firmware 73.00? I spoke to the importer of my Invermax VMIII (which is presumably identical to the RCT VMIII of some other user that mentioned the same fan behavior with the exact firmware version 41.3 that I have) and they say that this is normal, and that there is no other firmware that will change that. Normal maybe, but very annoying and I don't see the point. If the batteries are charged and you are using the utility grid (in bypass mode) there is no need for the fans to run on and off, as the inverter is not doing any work. If the fan behavior of the MKS is less annoying (only on when charging and when load is demanded from the inverter when batteries are delivering the power) I will try get hold of an MKS in stead of the VMIII I have now. In the mean time have I installed a change over switch to totally isolate the inverter from my DB, and I can connect it when the need arises (load shedding form our utility). Kind of defeats the object of having an Inverter setup as a UPS, but I cannot live with the fan noise the whole time, and I do not have another suitable place to install it and the batteries. I just make sure the batteries are fully charged, Isolate the inverter and draw my "standby bus" in the DB from utility (actually from the CB that feeds the inverter). Can all MKS 5KV units be loaded with firmware 73.00?

@Coulomb which Axpert is this? VM, MKS or King?

Thank you for the replies. @Coulomb it is indeed InverMax branded, distributed by www.allpower.co.za. Will have a look at the discussion you mentioned. This fans are driving me nuts!

Does anybody know how the cooling fans on the Axpert VMIII 5K should behave? I read that it is an algorithm that changed with different firmware updates. Mine seems to act very strange. The fans will run quite loud for about 10 minutes every half hour or so and then just go off. This all happens in Bypass mode (on ESKOM power) with less than 500w load, without the load being increased (and the PylonTech batteries fully charged). Does this sound right and is it possible to change this? I bought the inverter 2 weeks ago, and its an InverMax branded model. It is the newer PylonTech-ready model with the removable display, and Pyl in the menu #5. My firmware is U1= 41.3, U2 = 2.0, U3 = 0.21 Any help will be greatly appreciated

Hi, hope you can help. I recently bought an InverMax branded VMIII 5K. Went through the whole exercise to connect it to 2 Pylontech US2000 batteries. All seems to work fine, but I have noticed that the SOC indicator lights on the batteries cycle on and off at random intervals. Its almost as if they are resetting themselves. Does yours do the same? The Inverter also sometimes shows only 1 battery in the group, and other times 2. What is your U1 firmware number if I may ask?