Hi everyone

I have the mecer and RCT inverters 5KW each, connected in Parallel a few weeks ago I had to have the Mecer inverter repaired as just failed stopped working,since i got it back i just had problems,the firmware changed which meant they couldn't communicate took it to another place to up date the firmware now they do communicate but only the MS inverter give output.I have gone through all the wiring all is good.If i reset them and change the master to the other unit then it provides an output so it tells me mechanically all is good can still be software problems 

Please do you have any advice for me 

Thanks in advance

 

Edited August 19, 20233 yr by Maanie

Can you remember what versions they were?

What versions are they now (U1 main firmware versions)?

Are they both in parallel mode? That is, one says HS (master) and the other SL (SLave)? Or does one perhaps say NE?

20 hours ago, Maanie said:

If i reset them and change the master to the other unit then it provides an output so it tells me mechanically all is good

In that configuration, do they both output?

Can you provide a photo of the output wiring? They might be "daisy chained" which means that the one nearest the load will do almost all the work.

20 hours ago, Maanie said:

I have gone through all the wiring all is good.

Does that include the parallel and current sharing cables?

This is the Rct unit 

 

This is the mecer unit 

 

 

The one thats the master gives output only.

The slave one only charges the batteries and every minute or so where is says SL ot goes to Ne for a second and back to SL again 

You have a PF0.8 model and a PF1.0 model. These can't successfully be paralleled. I'm surprised that one doesn't stop with fault code 72. And that they don't blow up, despite the mismatches.

You also have a 58.4 V model and a 64 V model; these can't be paralleled.

You also have a mixture of patched firmware (72.70C) and non-patched firmware (74.40). You should not be paralleling that combination either. The patched firmware has to alter the meaning/interpretation of bit patterns in the CAN packets.

The only thing in common between the two models is that they are Voltronic 5 kVA models. That's not enough.

Sorry for the bad news.

Edited August 22, 20233 yr by Coulomb

Thank you for the info.

So best way forward would be to sell them separately and get a new 10KVA unit with BMS system.

What brands should I be looking at any preference there,

3 minutes ago, Maanie said:

Thank you for the info.

So best way forward would be to sell them separately and get a new 10KVA unit with BMS system.

What brands should I be looking at any preference there,

If you are not based in the Western Cape I would look at these available at The Powerforum Store - the pricing provided is as per The Powerforum Store
KODAK Solar Off-Grid Inverter 5.6kW 48V R 14,432.50 
KODAK Solar Off-Grid Inverter King with UPS 5kW 48V R 12,075.00 
KODAK Solar Off-Grid Inverter MAX 7.2kW 48V R 19,423.50

If you are based in the Western Cape then you must look at either Deye or Sunsync - If I understand the new regulations for the Western Cape correctly
Deye: 5Kw Single Phase Hybrid Inverter (SUN-5K-SG01LP1-EU) R 21,700.50
Deye: 8Kw Single Phase Hybrid Inverter R 35,614.35
Sunsynk 5kW 1P Hybrid PV inverter 48V R 21,505.00 
Sunsynk 8kW, 48Vdc Single Phase Hybrid Inverter with WIFI included R 35,075.00
Sunsynk 16kW Single Phase LV Hybrid Inverter

I see there is currently a special running on the Sunsynk