How To

Inverter Operation: AGM Power Systems

Does you van have an AGM power system with a Magnum ME-RC50 control panel? If so, this video will give you an overview of how to use it during your adventures on the road.

If you have any questions about the procedures covered in this video, please reach out to our service and warranty department at

Outside Van is not responsible for damage resulting from improper maintenance. This serves only as a guide to basic procedures.


The Magnum Energy inverter converts your AGM battery’s DC power into AC power, so you can use appliances that plug into 110v outlets. Let’s dive into the control panel.


Default Display Screen: The top row of your screen tells you the operation of your inverter. When the inverter is doing nothing, it reads “Off”. The bottom row shows your battery’s current voltage and amps going in or out. What you’re seeing on the screen is the default display. This can be changed by pressing the “Meter” button and dialing the knob to the right, and pressing the knob to confirm your choice. If you dial the knob once to the right to “SOC”, and press to confirm, you can see the battery’s current State of Charge, which is displayed as a percentage out of 100. If you dial the knob once more to the right to “Meters” and press to confirm, you can see the voltage. If you dial once more to the right, you can see power going out of or in to the electrical system. That’s because, even though you’re not running any systems in your van, like a fridge or lights, your systems like your Webasto control panel and the inverter control panel have diagnostic programs that are functioning in the background at all times. Because of this, you can expect to lose about 2% of your battery per day.


Charging: Now let’s talk about charging. The first way you can charge my system is by running your van [start van]. When you run your van, the alternator runs and charges your system. You’ll see the amps are now displaying as a positive number, meaning the batteries are now charging [point out positive amps]. When driving, your system charges quicker, and if you have added a secondary alternator you’ve positioned yourself for optimal charging.

When charging your battery via shore power, your inverter screen will read “Bulk Charging”, “Absorb Charging”, or “Float Charging”. When your van is plugged into an outlet [show van being plugged into shore power WC: To make this longer we can shoot the van being pulled into the garage, lights turning off, then plugging into shore], you’ll see the green light illuminated next to “Power” and “CHG”. There’s no need to press the Charger button, as your batteries will begin charging automatically when plugged in. WC: Show charging light Once fully charged, the system will drop to around 92%, then charge to back to 100%. As long as your van is plugged in, this will cycle indefinitely and your van will ready for your next adventure. This means you can feel confident plugging your van into shore power as it will manage itself for an infinite amount. When your van’s plugged in, all of the outlets will be powered by shore power taking the energy drain off your power system. So in turn, try to keep your van plugged in when available.


Inverter Button: When you turn the inverter “On” by pressing the “Inverter” button on the bottom left, [show pressing button] the display now reads “Inverting”. You’ll see that the green light illuminated next to “Power” and “INV”. You can now use your 110 outlets without being plugged into shore power. Remember that the size of your inverter determines what appliances you can use. For example, if your inverter has a capacity of 2000 watts or more, you can use appliances that output that wattage or less – don’t try to use an appliance with a higher wattage than your inverter can handle [show an appliance and it’s wattage specs – one that’s less and one that’s more with an “x”]. Since I haven’t plugged in any appliances yet, you’ll see that my output is 0 amps. Now let’s plug in a computer charger and see what happens. It now reads – XX amps [point out negative amps]. After you are finished with your desired inverter use, simply turn it off by pressing the Inverter button.


Fault Light: The “Fault” light will only come on if there’s a significant fault with either your output voltage or your input voltage. If your batteries have completely run out of power your fault light will illuminate. If this happens, you have to charge your batteries before your fault light will go away.


Shore Button: The “Shore” button let’s you control how much power is let in when your van is connected to a shore power plug. Normally, a house’s outlet is 15 amps, so the technicians at Outside Van have set your inverter to receive 15 amps. If you’d like to change this, simply rotate the knob to the right and press to confirm to select your amps. WC: Show this For example, if you’re at a state park campground, they occasionally have a 30 amp circuit. You can change your inverter input to 30 amps allowing your batteries to charge a bit quicker. Just remember, if your inverter is set to 30 amps and you plug it into a 15 amp outlet, there’s a chance that you could pop the circuit breaker.


AGS Button: The “AGS” button is used with a generator. At Outside Van our power system aren’t built to charge with generator. If you want to use the AGS charging method, please do the proper research prior to use.


Setup Button: Next is the “Setup” button, where all the programming is done, which has been set up ahead of time by the technicians at Outside Van. If you’re worried that your settings have been changed for any reason, please refer to the settings chart, which is available by request from our Service Department.


Tech Button: And last but not least, the “Tech” button. After pressing, it gives you information about the formatting version your inverter is running.


If you have any questions about the procedures covered here, please reach out to our service and warranty department at