conversion

I am using 2 panels in series on a small temporary 12v system because Midnite Solar recommends only 2 for 12v. But I have 3 in a line on the side of a shed.They are vertical so their output is way down from optimum.But for now thats the way it is. If I wanted to use the 3rd panel in series( and go 24v ) and thru the 30 amp KID controller and into a 12v LiFePo .....is there a way to approach that? I don't mind buying a DC to DC box if needed because I could make use of it later I think..if that would help...what do you think?

It will be helpful to provide details spec of the equipment you have, that will be a start.

thought I did.....KID?Midnite Solar 30 amp controller.. 315 watt panels. 37voc

I did not see the spec of the SCC or the panel, all I know is that you indicating 30A of battery charging current but no info about the max PV input Voltage of the SCC.
It has max PV input of 150V.
"315 watt panels. 37voc" Are you sure Voc is only 37V for this 315W panel? That is low Voc for 315W panel.

"If I wanted to use the 3rd panel in series( and go 24v ) and thru the 30 amp KID controller and into a 12v LiFePo" Are you talking about What do you mean 'go 24V'?

I got it ,thanks