You went through your checklist, charged your battery and made sure the breakers and lights are off before putting your vehicle into storage. Despite your efforts, your battery has gone flat. “What the heck is going on?” you may ask.
Unfortunately every RV will have something that will slowly draw electricity out over time. Some of the possible causes are the LP gas detectors, fridges and radios. Even an inverter when switched off can still draw a little current over time. Something that can stop your battery from draining is a cutoff switch.
Battery cutoff switches come in a variety of different sizes and functions. Some types of battery switches come with a key that you can take with you as an added precautionary. Some switches have a feature where you can switch between battery banks.
A battery switch can also be used to disconnect power from an inverter DC connection. Larger inverters are wired with separate cabling from the battery to the inverter. Even when the inverter is switched off, there can still be a small current drain. Placing a switch between the inverter and the battery will prevent this from happening.
When installing a cut off switch, it is generally recommended to place it in the positive side of the DC circuit. There is some debate on whether it is better to install on the positive or negative side. For the most part it doesn’t really matter and there are valid arguments for either way. At the end of the day it’s up to you to make that decision.