Magnum AGS

[Sue46]

We are thinking about switching from the EC30 to the Magnum AGS. We have the BMK etc. installed. Our main reason is that the Magnum uses SOC which we feel is a much better indicator of our battery state than voltage. We are only at the research stage right now and are looking for input, pros and cons. Thanks.

[Louseman]

The EC30 will use your thermostat to determine if the Air Conditioning needs to run. If the thermostat requests the AC to run, a signal is sent to the EC30 to start the generator. The AC then kicks off after the generator is properly up to speed. This is advantageous if you have multiple thermostat zones.
With the Magnum, there is an external temperature probe, that you will need to strategically place, to sense if the AC needs to run (and start the generator).

I have the EC30, and looked at switching to the Magnum. You need a few modules to make the Magnum work (ME-ARC, ME-BMK and AGS). Cost was too much to just read SOC on the batteries.

I ended up purchasing the following to read the SOC of the batteries, and adjust the EC30 run conditions accordingly.
https://www.ebay.com/itm/Battery-Monitor-Meter-Wireless-DC-120V-100A-VOLT-AMP-AH-SOC-Remaining-Capacity-Z/264202160667
for $28. Shipped from China, so it took about 4 weeks to arrive. Note that i have not installed it yet, but have bench tested the meter/sensor.

Or, can spend $40 and get it quickly:
https://www.ebay.com/itm/Wireless-Ba...r/183247639501

Check the firmware revision on your EC30. I had mine updated in April from 3.02 R5. The current rev was 4.00 R6 (with resistor 37 removed). This software allows me to run the AGS without short cycling, as my shore power sense circuit is connected after the inverter...Argh!
Cummins will update the module for free, if you pay the cost to send it to them. Took me about 4 business days to get done.

[Sue46]

We are not interested in the AC portion of the Magnum just the battery charging portion. We already have the ARC and BMK so just need the AGS if we go this route.