Recent posts

#51

The Rosie / Re: Rosie 7048M with Grid Supp...

Last post by Brucey - April 19, 2026, 10:35:14 AM

Its another $207 but potentially could add a second mngp2 to have upstairs so you dont have to dive in to the basement all the time. Or just move your current mngp2 upstairs.

#52

The Rosie / Re: Rosie 7048M with Grid Supp...

Last post by Brucey - April 19, 2026, 10:34:06 AM

What is your grid support percentage set to? If the battery soc is above that threshold it will invert from battery. Will only add additional support from grid once you exceed Rosie rating (upto 60A max). Once soc drops below your threshold then it will switch to grid pass thru mode, no inverting.

Not sure what that is.  I will look that up when I get back into the coach. (where is the remote access feature?) I'm not really grokking how that works.  I always want to use the grid if I have it up to the max breaker size I have set.  This is a mobile version of the Rosie,  being in an RV probably hooked up to Shore Power I always want to use the Shore power up to the breaker size I have set.  I would never want it to pull from the battery when its not needed.   

But If I turn on the AC and it needs 25 amps and my breaker is set to 20 I want the AC to run and get the rest from the battery.  But I don't want to on a 30 amp breaker and run the AC and have it take anything from the battery it wouldn't be helpful to deplete the batter when that's not needed. 

I am wondering if they didn't think folks would be using these in an RV even though I have the mobile version? 

I am guessing there is a setting to have it work correctly for RV use?  Only use the battery when required to do so. 


 

So if you want it to prioritize grid then turn off grid support. That's designed to maximize your solar utilization.

Use Load Xfer mode. That should supplement limited ac input with inverter power as needed.

#53

The Rosie / Re: Rosie 7048M with Grid Supp...

Last post by bigbillsd - April 19, 2026, 12:31:19 AM

nd

Rosie limits AC IN to 75% of the "breaker size" setting + or - 2% This is to be sure to comply with the NEC 80% rule for continuous circuit limits.  The MNGP2 reads data off the CANBUS so there may be a slight delay on what you see.  In your case you set "breaker size" to 10A so Rosie will use battery to assist probably around 7A and there may be a little swing on the lower settings. 

Let me ask these questions to see I am understanding what you are saying. 

Breaker set to 10 amp.  No power would be taken from battery unless its pulling 7.5amps or greater?
If I wanted to allow 10 amps to be drawn from the grid, then 13.33 amps would be the breaker setting?

From what I can see I would not know the battery is being drawn down unless I am down in my inverter bay with the MNGP2?  Solar Assistant doesn't provide that from what I can tell. 

Hmm..

#54

The Rosie / Re: Rosie 7048M with Grid Supp...

Last post by bigbillsd - April 19, 2026, 12:16:20 AM

What is your grid support percentage set to? If the battery soc is above that threshold it will invert from battery. Will only add additional support from grid once you exceed Rosie rating (upto 60A max). Once soc drops below your threshold then it will switch to grid pass thru mode, no inverting.

Not sure what that is.  I will look that up when I get back into the coach. (where is the remote access feature?) I'm not really grokking how that works.  I always want to use the grid if I have it up to the max breaker size I have set.  This is a mobile version of the Rosie,  being in an RV probably hooked up to Shore Power I always want to use the Shore power up to the breaker size I have set.  I would never want it to pull from the battery when its not needed.   

But If I turn on the AC and it needs 25 amps and my breaker is set to 20 I want the AC to run and get the rest from the battery.  But I don't want to on a 30 amp breaker and run the AC and have it take anything from the battery it wouldn't be helpful to deplete the batter when that's not needed. 

I am wondering if they didn't think folks would be using these in an RV even though I have the mobile version? 

I am guessing there is a setting to have it work correctly for RV use?  Only use the battery when required to do so. 


 

#55

The Rosie / Re: Rosie 7048M with Grid Supp...

Last post by Brucey - April 18, 2026, 09:48:03 PM

I was testing out my 48v Battery charger on 120v outlet from my Rosie and noticed something I couldn't understand.  The charger was pulling a few amps, not much else was on so maybe the Rosie was putting 5 amps out. 
But thats when I noticed the Rosie was adding power from the battery instead of using all the power from the Grid as it was set to 10 amps, so there was plenty to be pulled.   In order to fix that I had to disable Grid Support. 

I would expect Grid support to add power from the battery if it was very close to the 10 breaker size set, but not when it was using less than half that could be gotten from the Grid set to a 10 amp setting. 
I don't want it to use the battery if all the power can be taken from the Grid based on the setting.  And I really don't think I should have to keep going into the MNGP2.   

Is it supposed to work like that?
How do I adjust that if it is?
What is the threshold that for using the battery based on the breaker size?  50% doesn't really sound right. 

-Bill

What is your grid support percentage set to? If the battery soc is above that threshold it will invert from battery. Will only add additional support from grid once you exceed Rosie rating (upto 60A max). Once soc drops below your threshold then it will switch to grid pass thru mode, no inverting.
 

   

#56

The Rosie / Re: Rosie 7048M with Grid Supp...

Last post by Wizbandit - April 18, 2026, 06:57:40 PM

Rosie limits AC IN to 75% of the "breaker size" setting + or - 2%
This is to be sure to comply with the NEC 80% rule for continuous circuit limits.
The MNGP2 reads data off the CANBUS so there may be a slight delay on what you see.

In your case you set "breaker size" to 10A so Rosie will use battery to assist probably around 7A and there may be a little swing on the lower settings.

#57

The Rosie / Rosie 7048M with Grid Support ...

Last post by bigbillsd - April 18, 2026, 10:51:28 AM

I was testing out my 48v Battery charger on 120v outlet from my Rosie and noticed something I couldn't understand.  The charger was pulling a few amps, not much else was on so maybe the Rosie was putting 5 amps out. 
But thats when I noticed the Rosie was adding power from the battery instead of using all the power from the Grid as it was set to 10 amps, so there was plenty to be pulled.   In order to fix that I had to disable Grid Support. 

I would expect Grid support to add power from the battery if it was very close to the 10 breaker size set, but not when it was using less than half that could be gotten from the Grid set to a 10 amp setting. 
I don't want it to use the battery if all the power can be taken from the Grid based on the setting.  And I really don't think I should have to keep going into the MNGP2.   

Is it supposed to work like that?
How do I adjust that if it is?
What is the threshold that for using the battery based on the breaker size?  50% doesn't really sound right. 

-Bill


 

   

#58

The "Classic" charge controller / Re: Classic data on Home Assis...

Last post by ClassicCrazy - April 17, 2026, 10:36:33 PM

You're very welcomed! Glad it makes sense for you. For your other Midnite devices, do you know where to get the communication specifications? I understand the Rosie inverter/charger uses the CANBUS protocol... I'll ask AI. Maybe we can do something.

My project is on github - already have it talking to the Hawkes Bay and Little Rosie on canbus.
https://github.com/larduino/hawkesbay-can2mqtt
Larry

#59

The Rosie / Re: Rosie 7048M installed and ...

Last post by Brucey - April 17, 2026, 04:22:10 PM

On Tuesday I ran both my Roof Air Conditioners for a little over 4 hours (15,000 BTU heat pumps).  ~3000 watt draw.  The Big Rosie didn't even break a sweat.  I had been concerned about how much heat it would produce, but to my surprise the Basement was cool, and so was the Rosie. So far I have only heard the fans when I power up the Rosie, and they are not quiet. So them not running when pulling a fairly decent load for so many hours was not expected. 

I was going to insert a picture till I realized the Rosie Cover was upside down in my pic..  oops.. 

-Bill

As aaapilot mentions, that initial ramp up to max fans during power on is not representative of regular operational fan noise. I've run close to max (6.5kW) for extended periods with ambient temps at 90F and the fans still don't get anywhere near that loud. They are variable speed.

#60

The "Classic" charge controller / Re: Classic data on Home Assis...

Last post by qcda1 - April 17, 2026, 02:05:50 PM

You're very welcomed! Glad it makes sense for you. For your other Midnite devices, do you know where to get the communication specifications? I understand the Rosie inverter/charger uses the CANBUS protocol... I'll ask AI. Maybe we can do something.