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Hi, I am also trying to connect our Weco batteries to ICC/ICM to get individual cell readings - without success. Anyone managed to do it!? Thanks!

Thanks for reply and your time, it is not a load issue since I get the same result when setting the inverters to 5 amp charge each and the 7 kW generator have no issues to charge the batteries at 60 amp normally with about 3 kW in household load at the same time. The generator works perfectly when charging the systems individually, but normal days there is no need for generator power at all. The Masters battery bank just charges the Slaves battery bank. The stragen 270 volt issue only occurs when the Master and the Slave systems inverters are eager to get charge at the same time (in Utility mode when battery banks are lower than 55% SOC). It can charge Master inverter battery bank while the Slave system inverter is connected to the Master as long as the Slave system inverter isn't in Utility mode. I will probably install a dry-contact controlled relay/contactor that disconnects the Master to Slave system connection while the generator is charging and reconnects it when it isn't. That way it will be a more automated solution where the generator only charges the Master system (when needed) and the Master system charges the Slave system (when needed).

Correction: Everything works perfectly except for when both the Master system inverter and the Slave system inverter are in utility mode and at the same time needs charging from the Generator. 
Generator is connected to AC-In on Master system inverter, Slave system inverter is connected to AC-Out on Master system inverter. Then following occurs: either When generator start the initial “negotiation” of power it doesn’t stop (fluctuates between 200 - 270 volts) until one of the Master system inverters shuts off with an ICC mail alert “Fault : Inverter negative power” (I believe it is fault Code 60 - Current feedback into the inverter is detected).
Typically it happens on the slave (2) inverter and the master (1) is still on. or The initial “negotiation” of power succeeds but the voltage stabilises at high 270 volts (still 50Hz). In both cases the voltage between ground and neutral is at more or less zero volts (between 0.02 - 0.12 volts). I have checked & refitted the parallel cables between the Master systems inverters. It feels like the Master system inverter and the Slave system inverter are competing for the power ;-). Any ideas!?

Perfect! Thanks, I went for TN-C for the whole system, seems to be working perfectly!

Thanks, appreciated! No, it is an older one! If I recall stock was 72.70, it didn't have the "38" option.

Hi, Sorry for my English, I am from Sweden living in Tenerife, Canary islands. I am a newbie here and grateful to have found lots of relevant information as well as patched firmwares to my inverters!!! It feels like a well working & sharing community! We have a farm here with several cottages with tenants. We have two separate off-grid solar systems providing power. One “Master” with: 2 x Axpert 48v, pf 1.0, connected in parallel (patched fw72.20e) 1 x Genergy 6 kW generator (autostart) 24 x AmeriSolar 275w panels 24 x 2v Cynetic batteries (750Ah) 1 x Victron BMV 702 1 x Raspberry Pi with ICC One “Slave” with: 1 x Axpert 48v, pf 0.8 (patched fw73.00e) 9 x AmeriSolar 340w panels 8 x 6v Trojan T105 batteries ( 250Ah) 1 x Victron BMV 702 1 x Raspberry Pi with ICC Lately the “Slave” hasn’t been able to provide enough power during cloudy days and my plan is to connect the “Master” and “Slave” together to be able to charge the “Slave” from the “Master”. “Master” acting like a grid-provider ;-). Occasionally the Generator will be kicking in to provide extra power needed. Now to the challenging question: How should the grounding/bonding be made to keep all the inverters & generator “happy”? Thanks for your input in advance!