I have two 12volt 300 ah lithium iron phosphate batteries
My intention is to power my camper with solar, currently I am aiming for a 40 amp mppt charge controller and around 300 or 400 watts of solar
Basically this system is intended to power my lights and maybe a usb cable during emergency

Should I wire the batteries in series or parallel?

My thoughts currently is I should stick with 12volts and just combine them into 600ah 12v, instead of going to 24v 300ah
Opinions?

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Are you by chance trying to power 12" Kenwood Tornado subwoofers and Rockford Fosgate amp with solar power?
If so I have the forum for you

Overkill as fuck for lights.unless your including the fridge and stuff as well.
Should wire them to fit your inverter accordingly,most inverters are 12v so series
For your use id trim that down to one 200w panel and one battery should be plenty for lights and charging your phone especially during summer

Sounds like you are making a basic thing hard.

Parallel

Maybe use a windmill

aprox 90%of solar panel users have no power when the grid breaks down

I drive a diesel. Sorry

What