More efficient 12v or 115v ac

[Pitmansm]

Which is more battery efficient? A 12v mini split or a similarly sized mini split that’s 115 requiring an inverter. I’m sourcing the smallest mini split o can for my UEV-490 offroad trailer. Going to try and scale a battery bank to be able to keep it cool 1/4 the day and all night in desert heat.

I see some truck ac units but they seem to have constant speed motors attached to an ac compressor and also see really high seer mini splits 9000-10000 btus trying to decide before i go modifying my trailer to fit a condenser

 

[time2roll]

The highest SEER ratings in mini split seem to be 240 volt as best I can tell. SEER rating would be the yardstick I used.

 

[Pitmansm]

Yea there’s some 115’s out there I’m just making sure i can cool this small thing and heat it and fit the condenser and not buy a unit that’s too small but not too big so I can run this b on battery

 

[BradCagle]

Consider if using an inverter 12vdc to 110vac you could be losing 10-20% power in conversion from the get go. Really high quality inverters might put you in the 90ish % efficiency.

Then it has to be converted again in the mini-split because they don't just use 110ac 60hz directly.

 

[Rednecktek]

As long as the amperage draw isn't too insane then avoiding the efficiency hit of going up and then back down would be the most efficient way.