OK the new one is 50v input? Not very much!
SPECIFICATIONS Solar Boost 2512i-HV
Output Current Limit 25 amp maximum 36 cell modules ?? 20 amp maximum 60 cell modules
Nominal Battery Voltage 12VDC
PV Input Voltage 50VDC absolute maximum (Recommend maximum VOC at STC ? 40VDC)*
PV Input Power Recommended maximum, 340W with 36 cell modules / 270W with 60 cell modules
(Haven't found the old one here's specs yet.) ok the manual says 28v max? Is it only for doing MPPT with 12v panels????
http://www.blueskyenergyinc.com/uploads/pdf/Manual_BSE_SB2512iX.pdf