Two brand new Quattro 48/5000/70 instantly trigger battery BMS Short Circuit when connecting DC

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@ArmandoCruz

Quattros before attempting a manual pre-charge

On the right track. You need a better way to pre charge. If you look around the forums, this is a common issue with the first power on.

I have found a decent 5W resistor does the job.

Other have come up with ideas.

Multiplus-II 24v/3000 precharge resistor

You could make or purchase something like this: Inverter Pre-Charge Assembly | Off-Grid Power Systems