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Old 11-22-2013, 09:27 PM   #1
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Dual Inverter Question

To all the Anthem and Cornerstone owners who have two inverters, I have a question for you. The Magnum inverters have the ability to configure the amount of current to pull from shore power. If the AC load exceeds this limit, the inverter will try to meet this demand by utilizing the batteries. How do you configure the two inverters so as not to overwhelm one shore circuit and blow the breaker at the pedestal? For example, if the pedastal supplies 30A, then do you configure both inverter shore power to 30A or some combination 20/10, 15/15 on the two inverters to avoid exceeding 30A? It seems that to do this correctly, the best solution would be for the two inverters to talk to each other and to know what each inverter is drawing from the shore power. I haven't heard or seen anything about that and wonder how it all works together.
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Old 11-22-2013, 09:57 PM   #2
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Quote:
Originally Posted by SteveUpp View Post
To all the Anthem and Cornerstone owners who have two inverters, I have a question for you. The Magnum inverters have the ability to configure the amount of current to pull from shore power. If the AC load exceeds this limit, the inverter will try to meet this demand by utilizing the batteries. How do you configure the two inverters so as not to overwhelm one shore circuit and blow the breaker at the pedestal? For example, if the pedastal supplies 30A, then do you configure both inverter shore power to 30A or some combination 20/10, 15/15 on the two inverters to avoid exceeding 30A? It seems that to do this correctly, the best solution would be for the two inverters to talk to each other and to know what each inverter is drawing from the shore power. I haven't heard or seen anything about that and wonder how it all works together.
My understanding is that the the Magnum inverters can only pass through 30 A / leg, therefore a 2 in 2 out configuration would only yield a Max of 30A to either leg. My assumption is that 1 leg would go to one inverter and the 2nd to the other, in a 1 in 1 out configuration Neither should pass more than 30A. I would like to hear explanations from others as well.
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Old 11-22-2013, 10:14 PM   #3
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I have looked at the Magnum manual available here: http://www.magnumenergy.com/Literatu...eries)_Web.pdf and the inverter can clearly handle 50A.

Your comment however triggered a new thought. These coaches have 8 6-Volt batteries. I assumed that these batteries were wired with 2 6-Volt batteries in series and then each pair was wired in parallel. Is the battery bank in fact wired in parallel where there are 4 x 2 - 6Volt batteries shared between the two inverters? Or does each Inverter have its own independent battery bank consisting of 2 x 2 6-Volt batteries? Having two independent banks of batteries would make energy management more challenging I would think.
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Old 11-22-2013, 10:26 PM   #4
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These are Magnum Energy inverters that are designed to Parallel. This means that the two will communicate with each other and automatically adjust the power draw. The two also read the same battery bank, and adjust accordingly. Basically 2 inverters function as 1 larger unit.
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Old 11-22-2013, 10:49 PM   #5
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I question whether the inverters will augment power by drawing on the batteries when the 30A shore power is exceeded. I have never seen anything in the manuals to that effect. I think people may have been confused about the shore poer max setting. The Magnum manual says "Shore Max/Input Amps: This setting ensures the inverter AC loads receive the maximum current available from the utility or generator power. When the total current used to power the AC loads and charge the batteries begins to approach the Shore Max setting, the current that was used for charging the batteries will automatically be reduced."

That speaks for itself. I think that the coach will draw as much power as it can from the shore connection, and if the shore power capacity is exceeded, the shore outlet circuit breaker will (hopefully) pop. Only then will the inverter draw battery power to service the coach.
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Old 11-23-2013, 07:13 AM   #6
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I have looked at the Magnum manual available here: http://www.magnumenergy.com/Literatu...eries)_Web.pdf and the inverter can clearly handle 50A.
Transfer Relay Capability
MS2000: 30 A single input
MS2012, MS2812, MS4024: 2 legs at 30 A for 120 V/30 A or 240 V/60 A service

MS Series Data Sheet
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Old 11-23-2013, 08:01 AM   #7
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Transfer Relay Capability MS2000: 30 A single input MS2012, MS2812, MS4024: 2 legs at 30 A for 120 V/30 A or 240 V/60 A service MS Series Data Sheet
The model I was referring to was the MSH model where the hybrid part is where the inverter combines AC with battery to handle high loads. But that is not the model used in the Entegra. What is actually used? Is it the MS2012 and Ms2812? Does each inverter have it's own battery bank?
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Old 11-23-2013, 08:19 AM   #8
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I don't believe each operates its own battery bank. they are programmed to work together as MRUSA said.
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Old 11-23-2013, 09:04 AM   #9
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In looking at the manuals for the MS2012 and MS2812 (the two inverters I think are included in the Entegra coaches) I don't see any reference to how the two inverters are tied together.

I see that model MS4024 supports Series Stacking for 120/240 VAC, but neither the MS2012 nor MS2812 support stacking.

Perhaps someone with one of these coaches could trace their battery cables and see if they can tell if all the batteries are in the same bank or are in different banks for each inverter.
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Old 11-23-2013, 09:13 AM   #10
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MRUSA14 - I see that the MS2012 and MS2812 do not do support the hybrid behavior that the MSH models support... I started off by reading the MSH manual and I didn't realize it was unique to the MSH series.
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Old 11-23-2013, 09:32 AM   #11
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Originally Posted by SteveUpp View Post
To all the Anthem and Cornerstone owners who have two inverters, I have a question for you. The Magnum inverters have the ability to configure the amount of current to pull from shore power. If the AC load exceeds this limit, the inverter will try to meet this demand by utilizing the batteries. How do you configure the two inverters so as not to overwhelm one shore circuit and blow the breaker at the pedestal? For example, if the pedastal supplies 30A, then do you configure both inverter shore power to 30A or some combination 20/10, 15/15 on the two inverters to avoid exceeding 30A? It seems that to do this correctly, the best solution would be for the two inverters to talk to each other and to know what each inverter is drawing from the shore power. I haven't heard or seen anything about that and wonder how it all works together.
I found this interesting.

I wrote Magnum about the load carrying feature because I wanted to set my input amps at 13 yet be able to start and run an AC unit off a regular house 15 amp breaker- or off a Honda 2K plumbed into propane.

Their rep replied that they do not guarantee the load carrying feature will work fast enough to start a "motor" like an AC unit without tripping.

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Old 11-23-2013, 09:44 AM   #12
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Uncle Dave - turns out I think I was wrong about the load sharing capability because I don't think the Magnum inverters used in the Entegra coaches have that capability... The load sharing feature is an MSH series feature not the MS.
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Old 11-23-2013, 11:12 AM   #13
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A couple days ago while talking to CS I noticed one of my inverters was dark, the other had several green lights. I asked about it and he said the batteries assigned to one inverter were fully charged while the rest were still being charged by the other inverter. So looks like they do charge specific batteries and not cooperatively.
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Old 11-23-2013, 01:17 PM   #14
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I believe my coach was built in August this year and according to the manuals provided, I have the MS 2812 and a series ME modified sine wave for the second inverter.

There is a review written by Mark "Cruzer" that covers the new MSH hybrid posted on FMCA.

Probably the single disappointment with our Anthem vs the Allegro Bus was the lack of EMS. The bus comes with the PCI system and remote display which I really miss. That is going to be one of my priorities for upgrade but it is something I don't feel I can tackle based on the PCI installation manual.

I can't really understand why Entegra misses out on this feature.

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