To program a Magnum you need the Magnum remote with programming ability....
OR you need to pay a dealer to do that for you.....
Skip that, motorhome dealers are not smart enough to do that....
The MM-RC is a remote on/off switch......it is a on/off switch....it is not the programmer
The ME-RC is a remote programmer........for basic functions
The ME-ARC is a remote programmer.......for advanced functions.......for the very advanced ME-XXXX-PAE and similar models. Your unit does not have advanced functions.
The Magnum Inverter/Chargers need to be programmed on installation. To do this you need the manual and the programmer. The Magnum defaults to a 400 a.h. battery and WILL COOK a smaller battery.
Get the battery charge data from the manufacturer of the battery, DO NOT USE generic charge data, get it from the source if you want decent life from your battery, guesses don't get it...get the bulk, adsorb, and float settings from the horses’s mouth....the manufacturer of the battery....no exceptions.
SUGGESTION....
Go to solar-electric.com (Northern Arizona Wind Sun)
search your EXACT model number
Go to the page where it is sold
Scroll down, you will see a place where you can download the complete user and service manuals.
Get the manual
Search for ME-RC remote control, buy it.
download the manual for the ME-RC from the same page as the remote is sold on
Follow setup instructions....
enter data
The Magnum defaults to maximum battery charge, set as approiate for the battery as installed...not more than 20% of rating of battery.....i.e. 100 a.h. battery 20 amps maximum charge....200 a.h. battery 40 amps max.....etc.
You will need to scroll down past all battery settings to “CUSTOM” or “USER TYPE” to really set anything...
When you disconnect the batteries and the remote all programming is lost, unit needs to be reprogrammed...
The manual says different that the Magnum has non-volitable memory.... Mine goes stupid when battery is disconnected for service.........Either Magnum is stupid or my Magnum inverter is stupid....
I do not have an MM model , I have the MS-4024-AE I have had to reprogram it several times as it cant seen to remember the inputted data...
Dont shoot the messenger.....I did not design this unit.
DISCLAIMER.......I have no ties to NAWS, only a customer of the most helpful, informed solar dealer....they even take calls and do support what they sell.....