Recent posts

#1

The Rosie / Re: Rosie in South America Guy...

Last post by holdmode - Today at 03:41:07 PM

Mahendra: Turn your Rosie breaker OFF, and Barcelona, leave the battery ON. and check the screen, If it turns off or you have a faults warnings Ext batt V Out of Range. Try it

My case, in my "vacations" for two months and testing it, Rosie run perfectly, "again", but when I turn off Rosie breaker the MNGP2 boom, I have a faults warnings Ext batt V Out of Range. The problem is I'm back to the city and I can't doing anything else. My mom only tuned Rosie ON when the grid went down.

#2

MNPowerFlo5 / Mounting MNPowerFlo5 batteries...

Last post by SMRsierra - January 09, 2026, 10:36:38 PM

Hi All, first post. 

Has anyone in the Forum sucessfully Mounted MNPowerFlo5 batteries in an EG4 6 Slot Battery Rack?  'Rack seems really well made. 

But the screw holes in the rack are too narrow and don't line up with the center two slots in the PF5 front Mounting Bracket with the handles.   I'm wondering how others may have handled this?   

If you remove the mounting handles from the mounting bracket , the 4" holes line up with those in the EG4, but I'd have to enlarge them to fit screw size of the mounting bolts, which I assume would impact the battery warranty.

The batteries are sitting on slide in supports.  I'd like to get two bolts through the mounting brackets on each side, but I may only be able to get one as the holes don't line up, or I would have to drill new ones in the EG4 and use captive bolts. 

Because the batteries will be sitting on slide in supports, and the Rack won't be moving around, perhaps  getting one mointing bolt in would be sufficient?   

I'd appreciate hearing how anyone else addressed this using the EG4 rack, or a similar rack mount. 

thanks in advance. 

 

#3

The "Classic" charge controller / Re: Classic 250 troubleshoot h...

Last post by FNG - January 08, 2026, 08:49:19 AM

Usually if the battery voltage spikes when the classic tries to charge it is indicating a high resistance connection some where. Take the front of the classic off and check the battery terminals with a volt meter, Does it also jump up to absorb like the display? if so keep checking back through the system to find the issue.

#4

Hawke's Bay / Re: Input votlage for Hawk's b...

Last post by qrper - January 07, 2026, 12:25:56 PM

Open Circuit Voltage, corrected for the coldest temperature experienced in your area. The best sure way to destroy a Charge Controller is supplying too much voltage.  Midnite provides a voltage calculator on their website for their charge controllers.  You pick your solar panels or just type in the voltages, high & low temps, # of panels and serial-parallel combinations, and it will calculate if you are within limits for the different combinations.  Good luck with your system!

Dave

I knew about the calculator, and thought it was for the classic only as the Hawk's Bay has a much higher input voltage. I'll check it out.

mike

#5

The Rosie / Re: Rosie in South America Guy...

Last post by FNG - January 07, 2026, 10:08:09 AM

Will do that if it repeats.

I found the Midnite temp sensor was reporting incorrect battery temperature- 42-45 degrees celsius causing a low batt temp warning.
Tried unplugging, still the same

Swapped it out and resolved the issue so far.

You could ohm the temperature sensor and make sure it is the correct resistance. The should change as you heat or cool it off.
Larry

You should note the Rosies battery temp will be over written by the powerflo battery if closed loop regardless of the battery temp sensor

#6

Hawke's Bay / Re: Input votlage for Hawk's b...

Last post by aaapilot - January 05, 2026, 04:23:18 PM

Open Circuit Voltage, corrected for the coldest temperature experienced in your area. The best sure way to destroy a Charge Controller is supplying too much voltage.  Midnite provides a voltage calculator on their website for their charge controllers.  You pick your solar panels or just type in the voltages, high & low temps, # of panels and serial-parallel combinations, and it will calculate if you are within limits for the different combinations.  Good luck with your system!

Dave

#7

Hawke's Bay / Input votlage for Hawk's bay

Last post by qrper - January 05, 2026, 11:38:35 AM

Everyone,

when calculating the input voltage from the solar panels, do you use open circuit voltage or VMP, or voltage at load?

The panels I'm interested in list open circuit voltage at 49.8V while voltage at load is 40.3V. When you add 12 panels in series, there's quite a bit a variance between the two, like 114V difference.

So which one do you use to calculate input voltage for the controller?

Mike

#8

The Rosie / Re: rest Rosie to change batte...

Last post by qrper - January 04, 2026, 11:00:15 AM

How does one reset Rosie to change battery chemistry? Can it be done without a complete re-install of the firmware?

mike

Click Setup, click battery Config scroll to Chemistry and click, oh no, you have to reset battery configuration default, click USE click System Functions, and click Set system to Default. And follow the command.

Thanks...

#9

The Rosie / Re: rest Rosie to change batte...

Last post by holdmode - January 03, 2026, 04:24:30 PM

How does one reset Rosie to change battery chemistry? Can it be done without a complete re-install of the firmware?

mike

Click Setup, click battery Config scroll to Chemistry and click, oh no, you have to reset battery configuration default, click USE click System Functions, and click Set system to Default. And follow the command.

#10

The Rosie / rest Rosie to change battery c...

Last post by qrper - January 03, 2026, 11:45:29 AM

How does one reset Rosie to change battery chemistry? Can it be done without a complete re-install of the firmware?

mike