Thank you, and it looks like it was moved. If you did that thank you, I appreciate it!Hi,
If you do not (yet) have an additional battery or even want to do without one, you can also operate a compressor fridge with its comparatively low power consumption on the starter battery for quite a while. The starting current of most compressor fridges is high, but the power requirement afterwards is relatively low.
To protect the battery and to be still able to start the next day or so I would use a battery monitor. In some cases, the fridges also have such low-voltage protection permanently installed.
If an aux battery is available, the fridge should of course be powered from there. This leads me to another aspect. It is important that this is a battery is designed as a consumer battery. Of course, you can also power it from a starter battery for a certain time. However, operation from a starter battery is not recommended. Starter batteries are designed to supply high currents for a short time and not for slow discharge through low currents.
To round this off briefly and give an idea that might be of interest to others. I work with an isolated solution in my rig. So, I have a secondary battery as a consumer battery, where among other things the fridge is fed from. This aux battery is not connected to the rig, but is only charged via solar (as backup I still have an automatic charger for "shore power connection", such as on the campsite). Keep it simple.
By the way, I think this topic is better in Electric and Electronics QA. What do you think, should it be moved there? @Rubi-life2018 ?
So I just need to add something, my fridge has a built-in low voltage cut off that is adjustable within 3 steps so it's protected anyway and the agm I choose is optimized to be able to deliver low current as a support battery while still being a good starter battery.
It's a Banner running bull but not sure if it's available in the US.