This is how I understand the Quattro to work with lithium batteries. It's not really a lithium profile. With mine (2012 model) I can do a firmware update that will allow it to accept discrete inputs from a BMS. It uses the temp sense input and one of the aux inputs as contact inputs from a BMS. If one input is true, this tells the charger to stop charging. If the other input is true, this tells the charger/inverter to stop drawing from the bank.
This would be if you wanted the BMS to control the charging. Alternatively, instead of the charger stopping charging on a signal from the BMS, the charger can switch to float.
The absorption setting I mentioned is the constant voltage level the charger maintains after the bulk phase. There is also a setting for how long the charger stays in absorption, which I believe could be set to zero. From what I've read about charging LiFePO4 batteries is this. To get a full charge the voltage is held at a constant voltage, let's say 3.6 VPC until the current tapers to 0.05C. This equals 9 amps on a CALB 180 cell. I can't remember if the Quattro can be set to go from absorption to float after this taper current reaches a preset. I have the interface software and hardware to make these changes, but I don't have it with me currently, or I'd look into it.
From James' earlier post it seems as though he lets the Quattro handle the charging simply based on a lower voltage lead acid profile and uses the BMS to protect the pack by telling the Quattro to stop if something went wrong, i.e. excessive voltage during charging. This is also supported by his statement that he floats his LiFePO4 pack. He uses the BMS more or less as a safety override and to balance the cells. Did I interpret you correctly, James?
Chris
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Posted by: clh5_98@yahoo.com
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