Modern tech for eAPUs. All electric APU's.

My truck has always been 24 volt as far as i know.

 

Mostly because of how the truck is wired. The electrical system goes directly to the batterys with a 12V alt and the batterys are normal 12V linked in series to provide 24V to the rest. Near as i can tell it used to be a drop axle heavy haul truck with a bunch of high draw 24V equipment and was set up to provide 24V off a standard 12V system. So less euro spec as altered american spec.

When i asked the dealer they said it was listed as supposed to be like this on the vin sheet. It works so im leaving it alone but when i do a rebuild or motor swap if this truck doesnt go bullfrog on me in going to see about converting fully one way or another.

 

You should had gone the route with the starting batteries like mine. I think you would had been more happier on it. I would add those to your set up before adding any other kind of batteries or even solar.

Also what is your Watts output when everything is running? I will check mine when I have AC running. Right now I have fridge running and I am at 97.2 Watts. When I run my small fan it jumps to 101.2 Watts. This is a small fan but pretty ###### for small fan. It is a Weed Growing fan but has very low pull to it, the reason I got it. Now it is at 52.7 Watts as the fridge must had kicked off. Pulls 7.6 Amps with fan and fridge on and 7.3 with fan off.

Also the way these starter batteries work they do not pull from both at the same time unless starting. This makes them last a lot longer and one battery will most likely need to be changed positions at some point. First battery has 230 cycles on it now and the second one has 110 cycles on it. They are good for 4000 cycles is my understanding.

 

What's the drain alone on with just the AC system? I am gonna bet that thing is not an efficient system and most likely causing you the real problems.

 

It varies. When its 100+ and i have it set to 70 it pulls around 800-900W until the cab cools then drops to 300-500w. If i leave the fan on auto it goes down as low as 130W and only kicks up.to bring the temp down when it goes up too much. Fridge pulls 120W and my fan pulls 75W if i set it to max..usuallly around 40W where i set it. Lights are all LED so pull maybe 10W if they are all on. My laptop pulls 250ish when im doing a movie, 450 gaming all my devices when charging are pulling 60W collectivly and to maintain charge when full around 15W