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Charging From Portable "Powerwall"

Here is my first test of using a 48V 0.89 kWH Li-Ion battery bank made from recycled 18650 cells, powering a Reliable brand 1500W pure sine inverter to charge my Nissan Leaf via the stock 120V EVSE. I was only able to get ~16s of charging before the battery banks dropped below 47V (3.35V/cell), so I stopped the charge. The voltage bounced back up to 56.1V afterwards. In retrospect, I used the wrong voltage as my cutoff, I could have ran it down to 42V, so the voltage sag under this heavy load (~4.5A/cell max) is normal since the average internal resistance of these cells is around 160mOhms. Details about the setup can be found on the Second Life Storage forums here: https://secondlifestorage.com/t-48V-1...