Can I use a Magnum MS2012 with a Battle Born LiFePO4 battery bank?
The Magnum MS2012 inverter charger will constantly monitor your battery banks voltage to ensure you are never without power. When first connected to a battery bank the unit will go straight into a bulk charge which will rapidly bring the banks voltage up to 14.4V. If the user is using the optional Magnum remote, they will be able to adjust to the desired voltage. Once the programmed voltage is reached the charging will switch to an absorption stage to finish the charging cycle. The great thing about this charger is the remote because it gives you complete control over the unit. As a user you are able to set float voltage, low voltage cut offs, and many more parameters to ensure your battery is maintained in the best way possible.
The inverter side of the Magnum 2012 is as straight forward as it gets: connect you’re A/C line to the main distribution panel of the unit and just like that you are ready to go! With this being a pure sine inverter you have nothing to worry about when it comes to your electrical devices.
Here at Battle Born Batteries we ran the unit numerous ways to really understand how it was going to work with our batteries. Our intial test was just to simply turn the inverter on and see how low it would drain the batteries in its default settings. In this test we saw the voltage drop to 9.1 before our BMS kicked off and interrupted the circuit. When we went to use the Charger side of this unit we learned that if your battery bank falls below 5v, the unit will detect a fault and not charge because a battery is not detected. To fix this issue, we recommend setting the low voltage cut off on the inverter to 11.5 volts or higher to ensure the inverter cuts off before the BMS activates in the battery.
If by chance your battery bank cuts off at low voltage and the inverter charger won’t recharge, there are 2 simple fixes.
-1.If you are in a motorized RV or are connected inline with an alternator, just start the engine and the BMS will click back on automatically.
-2.If you are not in line with an alternator, you can use any 12 volt source, including a Li-ion jump start pack to “wake” the battery up so the inverter charger will start delivering current to the batteries.
This issue does not exist in a system when a converter is used for charging. Also keep in mind when you set the low voltage cut off of the inverter charger to 11.5 volts (which is the point when your LiFePO4 batteries are empty) you will prevent this issue.
In our test we saw the charger bring our batteries voltage up to 14.56V delivering roughly 38A of current. Once it reached this point it dropped into a float mode slowly delivering less and less current.
Overall this inverter charger will work great with our batteries! However we do suggest the remote is purchased with the unit so the charging rates and battery status can be easily monitored and adjusted. Unfortunately without the remote there is no other way to adjust the charging values or low voltage cut off which is why we highly recommend this add on.
Bulk charge: 14.4v
Low voltage cut off: 11.5v