What is the maximum battery voltage for the Quattro 48/15000? I see when I run VE Configure for the 48/5000 the limit is 64.00 V for the absorption value, so is the 48/15000 the same? Can I use a string of batteries up to the absorption value?
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Quattro 48/15000 maximum battery voltage
The maximum DC input voltage for each product is listed in the data sheets.
For the Quattro they are here - https://www.victronenergy.com/upload/documents/Datasheet-Quattro-3kVA-15kVA-EN.pdf
The maximum DC voltage before inverter shutdown in a 48V nominal system is 66V.
I anticipate using a string of 3.2V LiFePO4 battery cells for a battery bank. If I take my maximum 66V DC voltage, and use 3.55V absorption setting per cell, then I get 66/3.55=18.59 cells maximum in my string. So an 18 cell battery string would be set to absorb at 18*3.55=63.9V, a 17 cell string is 17*3.55=60.35V, and a 16 cell string is 16*3.55=56.8V. Do you see any issues with using these battery string solutions with the 48/15000 Quattro?
Though its more common to use 16s with LFP batteries (easier to find bms systems), 18s shouldn't be a problem.
Under normal use, I'd prefer 3,45-3,50 V per cell as a maximum, higher is allowable but if you don't need the fastest charge it's better for the cells to stay lower.
