heres the spec or the 200 watt
Operating voltage range
C 12.0~18.0 Volt
Circuit power:Max. Charge power 2x200Watts
Max. Discharge power 2x25Watts
Charge current range:0.1~10.0A
Discharge current range:0.1~5.0A
Current drain for balancing Li-Po/Ion/Fe:200mA/cell
Li-ion/Fe/Polymer cell count:1~6cells
NiCd/NiMH battery cell count:1~15cells
Pb battery voltage:2V~20V
Net weight:740g
Dimension:200x135x57mm
so yes it will do 4s at 10 amp per side on the 30 amp psu