am up grading my setup from 2x 110ah leisure batteries. with a ctek 20a split charge and 200w solar with a 1000w inverter and a 100amp bm1 battery monitor. and for the new set up 4 x 120ah leisure batteries with a ctek 140a split charge to 300w solar and a victron 2000va smart inverter but i dont know if my old shunt is any good for new set up or what one to get if needed thanks for any help