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Old 05-11-2016, 09:11 PM   #43
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I just discovered a more elegant and simple resolution to shutting down the inverter and it is a Magnum option AS could have installed.



"The MM-DCLD (DC Load Disconnect) pigtail adapter is designed to provide a

means to DISABLE the inverter function when a 12 volt DC signal is removed.

This is useful in applications when a vehicle or boat is placed into storage

and the battery disconnect switch is turned off to disconnect all DC loads, the

inverter can also be automatically turned off if the MM-DCLD is installed."

Thanks Mcrider - that item looks interesting. I'll have to research it further to see if it works on the entire Magnum line since I've upgraded to a 2000 watt unit. Here is link to manual.
http://www.magnum-dimensions.com/sit...27-MM-DCLD.pdf


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Old 05-11-2016, 09:40 PM   #44
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Ok it looks like the MM-DCLD is only designed to work with the MM series inverter installed by Airstream. But there is a similar item known as the ME-DCLD that works with the other Magnum units including my MS-2000. Both big tails look the same but they might have some internal differences. Here is link to the ME-DCLD manual.
http://www.magnum-dimensions.com/sit...-A-ME-DCLD.pdf

I wonder what Lew Faber thinks of this Magnum accessory and if it would be a better solution.

Neat stuff!


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Old 05-11-2016, 10:08 PM   #45
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Originally Posted by Boxster1971 View Post
Thanks Mcrider - that item looks interesting. I'll have to research it further to see if it works on the entire Magnum line since I've upgraded to a 2000 watt unit. Here is link to manual.
http://www.magnum-dimensions.com/sit...27-MM-DCLD.pdf


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I'm very familiar with this device. The only problem is that you need a 'stack port' which is usually at the top of the RJ-11 input groupings.

Unfortunately, your MMS series inverter/chargers DO NOT HAVE THE STACK PORT. This is why I never mentioned this route for the Interstate coaches with the MMS series Magnums.

The red Blue Sea Systems M-series switch in the foreground is my go-to device for completely isolating the inverter from your battery system. The shot is of a freshly completed solar/ Magnum system with a 300 amp/hour lithium all neatly positioned under the curb side of the rear lounge.

Sorry guys!

PS: Mcrider, It should work on the MS-2012 or MS-2000 as they both have the required stack ports. I still prefer the manual M-series switch though as any electrical switch will require some parasitic draw to be operational.
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Old 05-11-2016, 10:35 PM   #46
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I've read through the documents for these Magnum DCLD accessories and it's not clear that they would eliminate all parasitic DC battery drain. The instruction sheet says the charger function will continue to work, that implies there is still an internal DC connection to the batteries. This does require more research and I plan to contact Magnum tech support and see what else I can learn before using this accessory. Need more info.


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Old 05-11-2016, 10:44 PM   #47
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I'm very familiar with this device. The only problem is that you need a 'stack port' which is usually at the top of the RJ-11 input groupings.



Unfortunately, your MMS series inverter/chargers DO NOT HAVE THE STACK PORT. This is why I never mentioned this route for the Interstate coaches with the MMS series Magnums.



The red Blue Sea Systems M-series switch in the foreground is my go-to device for completely isolating the inverter from your battery system. The shot is of a freshly completed solar/ Magnum system with a 300 amp/hour lithium all neatly positioned under the curb side of the rear lounge.



Sorry guys!



PS: Mcrider, It should work on the MS-2012 or MS-2000 as they both have the required stack ports. I still prefer the manual M-series switch though as any electrical switch will require some parasitic draw to be operational.

Thanks Lew. I posted my last as you were posting. I'm sticking with the BSS M-series switch I installed. Just looking for another way to disconnect the inverter and other DC loads independently. Perhaps a second switch would be best.


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Old 05-12-2016, 06:49 AM   #48
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Originally Posted by lewster View Post



PS: Mcrider, It should work on the MS-2012 or MS-2000 as they both have the required stack ports. I still prefer the manual M-series switch though as any electrical switch will require some parasitic draw to be operational.


I agree Lew that a switch is the ultimate solution for storage. For $30 I like this addition as it avoids the mistake of accidentally leaving inverter on when one intends to have the house in a low energy state (I.e. The convenience of hitting the main disconnect during short stays).

I do like your lithium setups but not prepared for that $$ yet. The AS has been in a driveway for 4 days with frig running and not until morning of day 5 have I seen 50% DOD. waiting for the sun to pop up. It was overcast yesterday. I'm satisfied with what the 300 Watt solar is doing especially for plug and play. I've concluded I need additional AH to accomplish what I'm after so plans in works for two more 24Ts.
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Old 05-12-2016, 08:54 AM   #49
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I like the solid state relays over solenoids since their parasitic loads are 3 orders of magnitude lower when they are on. It's true that they are never truly off but their bleed current is measured in micro-amps. To put that in perspective, a 70uA current would take over 160 years to drain a 100A battery. This is nothing compared to the internal discharge rate of lead acid batteries.


The ideal solution (IMO) is a separate inverter and charger with a solid state cutoff for just the loads and not the charger.

If you ever go with Lithium batteries, a good battery management system will not only protect the batteries from over charging or discharging, but will also handle all the charging and battery isolation without needing to turn a knob or push a button.
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Old 05-12-2016, 10:00 AM   #50
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I agree Lew that a switch is the ultimate solution for storage. For $30 I like this addition as it avoids the mistake of accidentally leaving inverter on when one intends to have the house in a low energy state (I.e. The convenience of hitting the main disconnect during short stays).

I do like your lithium setups but not prepared for that $$ yet. The AS has been in a driveway for 4 days with frig running and not until morning of day 5 have I seen 50% DOD. waiting for the sun to pop up. It was overcast yesterday. I'm satisfied with what the 300 Watt solar is doing especially for plug and play. I've concluded I need additional AH to accomplish what I'm after so plans in works for two more 24Ts.

With more reading of the Magnum inverter manual and thinking about this DCLD accessory overnight I've concluded it functions just like the On/Off switch on the Magnum inverter/charger. How well that works to stop the parasitic current in the inverter is something I can measure myself. If it is as low as pointed out by LB_3 it would be a useful item to add to the Magnum and certainly better than the solenoid used in Airstreams SB-164.


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Old 05-12-2016, 11:16 AM   #51
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I've been looking at this 100A solid state relay but they are available in larger sizes:

https://www.waytekwire.com/datasheet/44402.pdf
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Old 05-12-2016, 02:50 PM   #52
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With more reading of the Magnum inverter manual and thinking about this DCLD accessory overnight I've concluded it functions just like the On/Off switch on the Magnum inverter/charger. How well that works to stop the parasitic current in the inverter is something I can measure myself. If it is as low as pointed out by LB_3 it would be a useful item to add to the Magnum and certainly better than the solenoid used in Airstreams SB-164.


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I read it the same way. The no-load Magnum draw with Inverter On is 1.6amps. With inverter off, 0.4 amps. TheDCLD does not shutdown the charger. I've ordered it.
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Old 05-12-2016, 02:55 PM   #53
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At 0.4 amps you're looking at about 10AHs per day. That will kill a battery inside of 2 weeks in a garage with no power.
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Old 05-12-2016, 05:55 PM   #54
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Looks to me like the MM-DCLD is a nice addition to the basic 1,000W Magnum Invertor and can be plugged into the same port as the temp sensor by using a 6 pole phone splitter.
What say you Lew?
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Old 05-12-2016, 10:27 PM   #55
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Looks to me like the MM-DCLD is a nice addition to the basic 1,000W Magnum Invertor and can be plugged into the same port as the temp sensor by using a 6 pole phone splitter.
What say you Lew?
You would only need a 4 conductor splitter as Magnum only uses 4 wire RJ-11 plugs, but I'm not sure that the MMS series will accept the DCLD into that port. I've used a splitter for adding the ME-AGS-N which is a networked auto generator start wired thru the inverter that works with the MMS series and reads thru the ME-RC, but not sure about the switching device. I would suggest a call to Magnum tech support on that one.
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Old 05-12-2016, 11:34 PM   #56
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You would only need a 4 conductor splitter as Magnum only uses 4 wire RJ-11 plugs, but I'm not sure that the MMS series will accept the DCLD into that port. I've used a splitter for adding the ME-AGS-N which is a networked auto generator start wired thru the inverter that works with the MMS series and reads thru the ME-RC, but not sure about the switching device. I would suggest a call to Magnum tech support on that one.
I'll call them. Thanks Lew.
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