Hi everyone. I asked a question recently regarding disabling Bulk protection mode on a Phoenix battery charger. The thread is here:
https://community.victronenergy.com/questions/36530/phoenix-battery-charger-bulk-protection.html
During the investigation, with assistance from Victron support staff; we found that we were able to disable bulk protection by connecting a MK2 programming lead and using VEconfigure. So that's our Phoenix charger sorted.
So following on from that, now I have the same question and problem...but with the Skylla Charger. To be clear, this is the older non-I version of the chargers. We have several models installed, all are 24V versions ranging from 24/30 up to 24/100. The boards do not have an RJ45 port so I can't try the VEconfigure trick again. There is another connector on the board which looks like an IDC type ribbon connector, not sure what this is for though. Can't see anywhere else to plug anything in. There are DIP switches but none of these are allocated to bulk protection (according to the manual).
The manual says that after 10 hours of bulk charge, the chargers will switch to float mode to protect the battery. We have not observed this behaviour with our chargers. Our chargers will instead shut off and the fail LED will flash the code for bulk protection activated. These fault codes are not in the original manual but are in the manual for the Skylla-I and appear to be the same. If the charger is switched off/on again charging will recommence for another 10 hours but then the same will happen. Luckily, most of our sites that have these fitted have remote control generators instead of mains power so as long as we monitor our battery voltages we can tell when a charger has gone into Bulk protection mode and reset the generator to carry on charging.
Example: We have a 3000Ah battery bank that was discharged to 23.5V. It took over 30hours bulk charge with a Skylla 24/100 set to 100A charge to charge this back up. During this time I had to:
1. Start generator locally and then leave site. Charger operates at 100A Bulk for 10 hours.
2. After 10 hours, remote monitoring showed that battery voltage had dropped back down to 24V, charger failed on bulk protection.
3. Remote reset generator. Battery voltage seen to increase to 26V on charge again as Skylla is reset.
4. Repeat 2 and 3 every 10 hours
It wouldn't be so bad if the charger did what the manual said and went to float mode, at least this would eventually charge the batteries back up without our intervention, (not ideal charging voltages though). We can't go any higher with our charge currents, we've got 16mm feeders and that's it, space is tight.
So is there any way to do what we did with the Phoenix chargers and disable this mode? Or alternatively make the charger go into float mode instead of failing?
Cheers, Si