I need to charge the batteries at 44.2V. I can do this from the MPPT, but if I want to from the Inverter, I can’t go below 48V… is there anything I can do?
A 48V Quattro expects a 48V battery.
Are you sure you don’t mean 54.2V?
What battery are you using?
13s LFP 44.2V is exactly what I mean. If the MPPT can do it… why not the inverter?
Are your cut off /shut down voltages lower than that?
As an FYI if you use ESS the mppt will follow te ve bus charge voltage even if you set it differently.
You can always cap the charge voltage in DVCC that should solve the issue.
On your mppt choose a preset lithium profile then edit it so there is no temperature compensation as well.
Low DC Cut off V is at 39V
I set it to 44.2 on the DVCC… it doesn’t follow it… it charges until it reaches the BMS protection.
Good evening,
Set it to another type of battery, and see, but I’m not confident that you can have a “happy” charging curve below 48V anyway.
We checked your cells, these can handle higher, but why so low you want it?
I know one guy in Portugal who uses 60V Lithium, that works fine btw.
Below 48V, why?
Regards, Jeroen
I have 70kWh from a car. I don’t like to use them more than 3.4V/cell. They get unbalanced. They work perfectly as long as I don’t connect the MPPT to the CERBO :). I’ll try all the options. But the best option would be if there was simply a software update to the inverter that would allow this. If this work on MPPT, I wonder why they didn’t implement in the inverter too?! The V range on Victron inverters is 38-66V declared btw!
What firmware is on the inverter?
How has the bms been detected? That parameter only works if it is a recognised, managed battery, it also cannot override inverter minimums.
That is the INPUT range for the inverter, not the charger’s operating range, which is different.
ESS also raises the minimums further.
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Good morning,
Buy 3 extra cells, then you have 54.2V total at 3.40V per cell, 16s.
That also gives you more power and you can enjoy bog standard software and parameters.
Regards, Jeroen.