Over the last year, I've had three different Quattros installed with my LiFePO4 off grid system:
Quattro 48/3000/35 120V,
and just today, a new Quattro 48/5000/70 120V.
I can make none of these Quattros charge my battery at their rated values (200A, 35A, 70A respectively).
The new Quattro 48/5000/70 120V is the latest example of this. When it is started up, cold, it ramps from 0A to 61A, but it will never attempt any higher. Shore current limit is set to 50A, and this is a 53.5V battery that is being charged, so there should be 50A * 120V / 53.5V = 112A of shore capacity.
The battery in this case is well below the absorption threshold, and the Quattro is configured for maximum charge current (70A) in VEconfigure.
The ambient air temperature around the Quattro is roughly 10C today.
The delta between the Vsense pair and the charging cables is 0.20V at the peak 61A charging, so the stated 1.0V maximum delta is not being reached. (Calculated cable resistance is 5mOhm.)
It even takes the Quattro a few minutes before the fan spins up to cool the unit. At no point will it attempt its rated value.
I observe a slightly different, but similar, phenomenon with my 15KVA unit. That unit is rated to 200A, and when it is cold and enters bulk charging, it will begin at 190A for about four minutes. It then drops suddenly and in a characteristic curve to a stable charging current of roughly 150A, which is only 75% of its rated value. A sample graph of the charging current is here:
In summary: my units don't deliver their rated charge under any normal conditions, and I can't figure out why. Is this simply what we should expect in terms of performance from these units? Should I consider returning the Quattro 48/5000 120V since it will seemingly never even attempt to charge at 70A?