Author Topic: CLASSIC 250 CP with out AUX1 and 2 function  (Read 2296 times)


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CLASSIC 250 CP with out AUX1 and 2 function
« on: October 10, 2019, 09:19:57 PM »

Im new in solar and has become my passe temps.

I bought a MidNite 250 Special Edition with out AUXs activated.

the MidNite have the AUX connections but it seems that in this version are not activated,

Question is, is there a way to activated ? I bought a WB jr. but not power is coming out to power on.

Then asked to seller and he confirmed that this version comes with out AUX activated, wierd even the connections are there.

Thank you in advance,



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Re: CLASSIC 250 CP with out AUX1 and 2 function
« Reply #1 on: October 10, 2019, 09:31:10 PM »
Hi Frankie,  Welcome to the Forum.

The following is from  the MidNite Solar website:


It has come to our attention that there will be an auction featuring a large number of MidNite Classic 250 Charge Controllers. These, As the auction notes, are not standard Classic 250s. They were custom built for an OEM with specific design requirements. In order to reduce cost of these units, many parts and features that were non-essential to their application were removed from these controllers. Because these controllers were purchased as an OEM product and have now been transferred to a third party not associated with the OEM or MidNite Solar, they do not come with any warranty from Midnite Solar.

 They DO NOT have multiple MNGP slots so they can not be used in Follow me.
 They DO NOT have AUX 1 or 2 terminals so they can't be used with a WBJR or any AUX functions.
 They do not have ARC Fault protection.
 MNGP can not be programed for Voice.
 None of these features can be added back to this board.

 They DO HAVE an Ethernet Port so they can be used with MM2 and the Local App.
 They can be updated normally using our normal Firmware via USB
 They have Ground Fault Protection
 BTS input jack is functioning

 Thank You
 MidNite Solar"

SO,   it looks like  the answer to your  question,  is,   "NO",   there is NO way to enable  the Aux functions.  Seems that some of the electronic parts may have been  left  off of the circuit  boards,      etc.

Just a guess.    Good Luck,      Vic
« Last Edit: October 10, 2019, 09:32:49 PM by Vic »
Off Grid - Two systems -- 4 SW+ 5548s, Surrette 4KS25 1280 AH X2@48V, 11.1 KW STC PV, 3X MidNite Classic 150 w/ WBjrs, Beta KID on S-530s, MX-60s, MN Bkrs/Boxes.  Thanks MN for Great Products/Service/Support!


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Re: CLASSIC 250 CP with out AUX1 and 2 function
« Reply #2 on: October 10, 2019, 10:34:23 PM »
I have seen some postings for those Classic 250 CP models on ebay. Some of the sellers say that Midnite won't warranty them, and some of the sellers don't.  Seems like most of the sellers posting I have seen do tell all the features that are not active or capable on them.

If they have an ethernet port and modbus works - a person could use Node Red interface to do additional features or controls - see Node Red section on the Forums here.

system one
Classic 150 , 5s4p  Kyocera 135watt , 12s Soneil 2v 540amp lead crystal for 24v pack , Outback 3524 inverter
system two
Classic 150 ,5s 135 watt Kyocero , Jakiper 48v LiFePO4 , Outback VFX 3648 inverter
system three
Midnite KID MPPT 24 DC in to  12 volt AGM batteries


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Re: CLASSIC 250 CP with out AUX1 and 2 function
« Reply #3 on: October 11, 2019, 10:37:34 AM »
The issue is not software, We did not stuff all the parts to make things like Aux work as DC solar had no use for them. I do find it odd it has the small terminal blocks though as we did not stuff those either. Maybe send me a couple pictures of the insides and the serial # I will look it up in our data base


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Re: CLASSIC 250 CP with out AUX1 and 2 function
« Reply #4 on: October 11, 2019, 02:52:03 PM »
Thank you some much for the explanations.