The sensor is also a step up to 200 amps so it is better as your system grows. The third has a completely different type of sensor that now has the ability to calculate the difference between amps coming in and going out which is a big step up doing the math for you so you don’t have to babysit the system. By the time you install two monitors like that you might as well look at the next option for close to $30 Some prefer to install two on one shunt to have one showing the in and one showing the out. If you want to wire the switch you can get the switch from amazon here and wire it up like I did here. There are different ways you can set this one up, I will show you how to set it up with a switch so you can see how much is coming in and switch it to how much is going out. The first one is a simple battery monitor with a 100 amp shunt. If you need something that is more budget-friendly I have a few options for you and a little bit of help on how to setup the most budget friendly one. I also appreciate a good app and the app they have developed for this works well and makes changing the settings just about as easy as you could imagine. 3000 watts is usually on the larger side for inverters and it is more than capable of handling that. Also it has a 500 amp shunt so it can handle the bigger inverters that RVers love. It will work with any battery type, so if you start off with it on your current lead acid battery and choose to l ater upgrade to AGM or Lithium it can handle all of that. The thing I also like about it is the ability to have it grow with your system as upgrades are made. If any thing else is connected to the battery it will not be measured by the Battery Monitor. When installing the shunt it’s important to remember the shunt is the only thing connected to the negative side of the battery. The BMV-712 is a shunt based system to measure everything that goes into your battery and everything that goes out. As you let the battery rest the voltage will give an accurate reading but when you are using your RV that is the most critical time to find out the state of your battery. For example, if you are charging the battery the voltage will rise and give a false sense that your battery is charged more than it is as well as when you are using your battery, some kind of a draw on it the voltage will drop giving you the impression the battery is more depleted than it is. The reason the state of charge method was inaccurate was that only works if your battery can rest to give an accurate reading. Our original stock battery monitor was a voltage based monitor and it felt like I was always guessing what the state of charge actually was. I never used the display and the Smart Shunt is a little cheaper. It’s very similar to the BMV -712 but without the hardwire display. The BMV-712 from Victron was my favorite until the Victron Smart Shunt came out. A good Battery Monitor is an amazing device that can provide vital information and function.
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