This site is now in read-only archive mode. Please move all discussion, and create a new account at the new Victron Community site.
Hi.
I just set up an ESS system, consisting of a Cerbo, a Multiplus-II, a SmartSolar and a 48V LFP battery with no connected BMS.
I find it difficult to locate the battery voltage adjustment parameters. I would also like to limit the discharge current of the battery.
Could anyone chime in as to where these are located in the various interfaces?
Thanx.
Hello @thanar , the devices using battery params are generally the chargers (MP/MPPT) or the BMS telling those devices how to charge. For your system I would recommend to use a BMS, even if it is not connected to the Cerbo. You can still control the voltage/current by enabling DVCC. Hope this helps!
DVCC requires a BMS that can talk to the GX platform. The BMS in this specific battery doesn't have this ability. So I guess I should not be enabling DVCC. As far as the Multi or the SmartSolar adjustments go, as soon as I enabled ESS, there are no such adjustments available anymore. This is why I am trying to locate them.
I suggest reading the ESS configuration chapter step by step and then go through all necessary sections.
Charging parameters must be seit in the MP-II. The MPPT will follow these charging parameters in an ESS system, but you need to set the charge current in the MPPT itself.
OK, this doesn't make any sense...
I ran a new ESS assistant on VEconfigure and adjusted all settings as required. My main concern is that the charging voltage should not exceed 54.50V, because I've got a slightly unbalanced LFP battery. So I set both absorption and float at 54.00V through VEconfigure as per the screenshot:
However, when connected to the SmartSolar through Remote Console, "Charge Voltage" still shows as 58.00V, as per the below screenshot:
What am I missing?
Upon further reading of the ESS guide (chapter 4.2), I understand that the charge parameters should be set in VEconfigure. I should first add the ESS assistant, and then go back to “Charger Tab” and adjust the needed parameters. I should then upload the configuration file back to MP-II through VE remote. Well, kind of makes sense, but it still looks like a mess afaik…
Answering my own question. Bottom line is, the target charge voltage is set in the MultiPlus-II through VEconfigure, after having completed the ESS assistant as per the directions on chapter 4.2 of the ESS manual. Which means that you should also enable the charger on the MP-II, even if you only want to charge from solar. Doesn't make sense really.
Something else that makes even less sense, is the fact that the charge controllers will show a different voltage setting, which is something completely counter-intuitive. In my case, charge limit was set to 54.00V, while the charge controllers would report 58.00V for some reason.
Which leads us to the next question: what if I want to adjust the battery charging voltage by 0.5V? I guess I will have to edit the MP-II settings again using VEconfigure and then upload it to the inverter, which could lead to a system restart and the ESS relay tripping and stuff. This is kind of a mess.
All these options should be configurable through the GX device's ESS options. I don't get it why there's options and settings all over the place, since adding a GX device is supposed to unify the whole system.
Victron's user interface department is in need of an overhaul, imho.
While no product is perfect, no user interface will compensate for a lack of knowledge.
