12 volt and 24 volt on same solar panels

[208jum]

Hello not sure what happened I was approved and edited it and poof cant find it so here I go again
I have a 1996 camper and I already changed the charge controller to charge lithium batteries.
I have 4 varter 100 ah batteries under the bed going to run 12 volt cause I already have it hooked up to what I need.
I want to put 4 more of the same batteries under the bench seat up front and make it a 24 volt battery bank as it will run my chest freezer and electric appliances when needed.
I have 8 trina 245 W 30 volt solar panels not putting them on the roof as it has a 1 piece roof and no holes or leaks. So I will build a rack to put on the ground next to it.
But I want to hook the solar up to a busbar in the side door when I am using them and the question is.
If I Go from solar to busbar to 12 volt in back and 24 up front both going thru their own charge controllers
The solar will just be feeding more then 1 battery bank 1 being 12 volt and the other being 24 volt
Will it work I am not seeing why it shouldn’t
Seems it is still the same power coming in till the charge controller adjusts it.
Any help is appreciated. I just don't want to burn up my new trailer and solar lol.
Please and thank you

 

[740GLE]

So you want to charge a 12v battery and and 24v battery and you have 8 panels?

I’d say you’d be looking to have two solar SCC one for each battery depending on which system needs the most energy you could split it even 4 panels for each or say 6 for one and 2 for the other.

What 12v loads are you needing to supply?

 

[208jum]

oxygen concentrator and cpap on 12 volt and the trailer is all 12 volt so didn't want to change to much there just wanted 24 for freezer and things like the instant pot but I might be using 4 panels most of the time so was hopeing i could split it between the 2
depends on what i need at the time

 

[rodrick]

Won’t work like that the scc will sense the 24 volt batteries and try to charge all batteries to 24 volt specs you will need 2 separate scc’s

 

[208jum]

will have 2 different controllers' 1 for 12 and 1 for 24

 

[208jum]

But i could run a 24 volt inverter back next to the 12 volt and hook a charger up then solar panels would only charge 24

 

[rodrick]

Not as efficient but would work you would have losses from the inverter efficiency and the charger

 

[ULR]

Two MPPT controllers hooked to the same set of panels, each hooking them to a separate battery, will become confused when trying to figure out how much to load the panels to get the most out of them.

 

[TM48]

As stated you can only use one charge controller on a set of panels at a time. Configure your system voltage for the greatest load and use a DC to DC converter for the other voltage.

 

[740GLE]

oxygen concentrator and cpap on 12 volt and the trailer is all 12 volt so didn't want to change to much there just wanted 24 for freezer and things like the instant pot but I might be using 4 panels most of the time so was hopeing i could split it between the 2
depends on what i need at the time

So AC inverter on the 24v system?

Can you track the 12v consumption?

You might be able to get away with one 24v system and use a buck converter for small 12v system.

By using all panels on one battery bank it’ll be the most efficient way to harvest all watts into one system.

Otherwise you’re 12v system may be full by noon and idle the panels the rest of the day.

 

[Glock24]

I think the idea of makikg the 24V systen the main and and using a step-down DC-DC converter forma 12V is the best wsy to go.