New Kid Questions

[ClassicCrazy]

Hi...i am a new user here. As per my knowledge if you want a larger PV system then I think it is better  to go up to 24v and put all your panels on that at a higher voltage  and get the converter and that way you can do away with the 12v power supply . I am thinking the DC to DC converter is pretty efficient depending on what amp size you need.

Basically the closer the conversion of volts from PV to volts charging the batteries is better in that the controller makes less heat doing the conversion.
The other point is that the controller output is based on amps . So for example 30 amps out at 12 volts is less power than 30 amps at 24 v.
And then there is the cost of wire and voltage drop. So higher voltage from the PV string in means less voltage drop and can use a smaller less expensive sized wire.
So all those things are some things to take into consideration when designing a system. But even if you do the worst case scenario's of highest voltage input converting to the lowest battery voltage the controllers are designed to handle it though they may cut down the output some to keep the electronics in them from getting too hot.
Yes DC to DC voltage converters work great - though you do loose some power in the conversion again because nothing is 100% efficient .

Larry