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Old 11-27-2015, 10:02 AM   #1
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Service Bulletin 164 - Battery Draw

Having this SB done today. I understand the only advantage is it eliminates the parasitic current draw by the inverter when the unit is being stored.
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Old 11-27-2015, 10:20 AM   #2
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Good information, Mcrider. Thanks.
Lew, do you know anything about this? Does this mean we should be careful NOT to use the disconnect when plugged into shore power since the Magnum needs to be on?
Peter


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Old 11-27-2015, 11:56 AM   #3
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I had the same question and I'm not sure this SB would help me as I am either plugged in or operating on solar short term with my battery disconnect on so my frige and fantastic fan can run. Seems like this would benefit those who stored longer term while not plugged in. Also my VIN doesn't fall in the stated VIN range although my unit is in the stated date range.
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Old 11-27-2015, 01:41 PM   #4
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Does this mean we should be careful NOT to use the disconnect when plugged into shore power since the Magnum needs to be on?
No. Part of the existing problem is that the inverter/charger is wired in parallel to the 12v system, and so is still on even when the main disconnect is off. Meaning it doesn't matter whether you have the disconnect on or off when plugged into shore power for storage. In fact, the new solenoid is only essential if you store then van without plugging into shore power. If you hook up to shore power, you'd want to leave the new solenoid on all the time, but the 12v disconnect could be in any position.

If the inverter was shut off by the main disconnect, the new solenoid would not be needed. With the new solenoid you have a way to shut off the inverter/charger without performing vehicular surgery to reach the switch on the back of the Magnum unit. With both the main disconnect and the inverter solenoid turned off, plugging into shore power does nothing anymore, but you still have solar to keep the batteries charged.
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Old 11-27-2015, 02:18 PM   #5
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No. Part of the existing problem is that the inverter/charger is wired in parallel to the 12v system, and so is still on even when the main disconnect is off. Meaning it doesn't matter whether you have the disconnect on or off when plugged into shore power for storage. In fact, the new solenoid is only essential if you store then van without plugging into shore power. If you hook up to shore power, you'd want to leave the new solenoid on all the time, but the 12v disconnect could be in any position.

If the inverter was shut off by the main disconnect, the new solenoid would not be needed. With the new solenoid you have a way to shut off the inverter/charger without performing vehicular surgery to reach the switch on the back of the Magnum unit. With both the main disconnect and the inverter solenoid turned off, plugging into shore power does nothing anymore, but you still have solar to keep the batteries charged.

I'm not sure I fully understand you, Protag, but here's a scenario as an example:
At home it's plugged into shore power. But if I visit friends for a few days and have no need for fridge, etc, so the coach electrics will be in disconnect mode. I drive home and plug in and forget to undo the disconnect. Will the Magnum still do its stuff?


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Old 11-27-2015, 04:17 PM   #6
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After reading Protagonist's post, I went out and tested several configurations. My conclusion is as follows. The SB relay does not impact the Magnum's battery charging when the Main Disconnect switch is off. The Magnum continues to charge (indiated by the LED Status light). In otherwords, the Magnum stays in it's Standby Mode.

I'm infering from my test (without removing the jump seat to trace wiring) that the relay disconnects the 120 VAC Inverter output. This prevents the Magnum from seeing any load (i.e. it's Search Mode) and starting the inverter to produce 120 VAC. According the Owner's Manual, if the Magnum sees a minimum of 5 Watt load it will start the inverter.

So my conclusion is that you can have the Main Disconnect Switch in the off position and as long as shore power the Magnum will still charge.

Hope this helps
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Old 11-27-2015, 05:19 PM   #7
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This is the first I have seen of the SB (not being an authorized Airstream service center). I educate ALL of my clients to keep the inverter OFF (meaning that there will be NO 120VAC COMING FROM THE BATTERIES THE INVERTER AT ANY TIME) and to only put the inverter to the 'ON' position when 120VAC is desired when off-grid and then to immediately TURN OFF THE INVERTER.

This will remove any parasitic draw from the inverter as it searched for the minimum 5 watt load. It has NO EFFECT on the charging section of the Magnum when shore power is present.

I also add a 300 amp marine disconnect switch and a proper class T fuse into the positive DC cable running between the battery and the Magnum positive terminal. This allows for the total isolation of the inverter during off-grid storage and also allows for the required protection of the cable from a potential 10,000 amp transient short; something that the ANL fuse that Airstream provides will not approach but a situation that is entirely possible.
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Old 11-27-2015, 05:45 PM   #8
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Ah yes, all makes sense now. Thanks guys!


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Old 11-27-2015, 06:06 PM   #9
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This is the first I have seen of the SB (not being an authorized Airstream service center). I educate ALL of my clients to keep the inverter OFF (meaning that there will be NO 120VAC COMING FROM THE BATTERIES THE INVERTER AT ANY TIME) and to only put the inverter to the 'ON' position when 120VAC is desired when off-grid and then to immediately TURN OFF THE INVERTER.

This will remove any parasitic draw from the inverter as it searched for the minimum 5 watt load. It has NO EFFECT on the charging section of the Magnum when shore power is present.

I also add a 300 amp marine disconnect switch and a proper class T fuse into the positive DC cable running between the battery and the Magnum positive terminal. This allows for the total isolation of the inverter during off-grid storage and also allows for the required protection of the cable from a potential 10,000 amp transient short; something that the ANL fuse that Airstream provides will not approach but a situation that is entirely possible.
Sounding like one could just skip having this extra solenoid installed as it really doesn't add anything that the Magnum doesn't already take care of. Am I correct or still missing something?
Bill
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Old 11-27-2015, 07:09 PM   #10
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Sounding like one could just skip having this extra solenoid installed as it really doesn't add anything that the Magnum doesn't already take care of. Am I correct or still missing something?
Bill
Do you always store your Interstate with shore power connected? If so, then you could skip it. If you store it without shore power, you should get the solenoid installed and use it to shut off the inverter.
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Old 11-27-2015, 07:15 PM   #11
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Do you always store your Interstate with shore power connected? If so, then you could skip it. If you store it without shore power, you should get the solenoid installed and use it to shut off the inverter.
Sounds like what Lew is saying is that if you turn off the inverter at the remote panel it has the same effect as the solenoid would have with the master switch turned off. In other words, no draw from the inverter.
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Old 11-27-2015, 09:35 PM   #12
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Sounds like what Lew is saying is that if you turn off the inverter at the remote panel it has the same effect as the solenoid would have with the master switch turned off. In other words, no draw from the inverter.
According to the MMS-1012 manual, the no load draw for this inverter/charger is 19 watts, or about 1.5 amps DC coming from your batteries. If the inverter function is OFF at the ME-MR control panel, you should see no idling amperage draw, as the inverter function is now off and the charger section is also off when no shore power is present.

Seems like a very simple solution. If you can turn on a solenoid to disconnect the inverter function, why not simply do it from the provided control panel???

BTW, I much prefer the ME-RC remote to the very basic ME-MR that Airstream provides.

And speaking of Airstream, I have a limited supply of ME-BTS battery temp sensors (the ones that Airstream refused to install for a few years on the AI) available for a 'give away' price. PM me for more details.
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Old 11-27-2015, 09:49 PM   #13
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According to the MMS-1012 manual, the no load draw for this inverter/charger is 19 watts, or about 1.5 amps DC coming from your batteries. If the inverter function is OFF at the ME-MR control panel, you should see no idling amperage draw, as the inverter function is now off and the charger section is also off when no shore power is present.

Seems like a very simple solution. If you can turn on a solenoid to disconnect the inverter function, why not simply do it from the provided control panel???

BTW, I much prefer the ME-RC remote to the very basic ME-MR that Airstream provides.

And speaking of Airstream, I have a limited supply of ME-BTS battery temp sensors (the ones that Airstream refused to install for a few years on the AI) available for a 'give away' price. PM me for more details.
That's exactly what I thought you we're saying before. I'll skip having the solenoid installed as I always prefer less folks working on my unit. BTW I also installed the ME-RC when I upped my solar capacity. I also installed the temp sensor for the Magnum.

Thanks,
Bill
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Old 11-28-2015, 01:16 PM   #14
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Smile Service Bulletins

How/where can owners learn about these service bulletins? Seems we used to get them when our trailer was brand new.
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