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Repairing my MPPsolar 2424MSE(No PV input)
#11
Forgot to mention, electrically thay all appear to be identical internally and I think they may just be firmware limited or missing a FET in the back, that's all..

I have 40A units and the unnamed one is 60A, the top board is identical, I could not check the FET's underneath, but suspect the only difference is either some FETS missing, firmware or a very slight difference with a resistor/pin pacing on the board. I did send them a message to ask how I tell the difference and strangely enough they did not respond.

They are cheaper via Aliexpress.....
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#12
(07-12-2018, 04:43 PM)completelycharged Wrote: Forgot to mention, electrically thay all appear to be identical internally and I think they may just be firmware limited or missing a FET in the back, that's all..

I have 40A units and the unnamed one is 60A, the top board is identical, I could not check the FET's underneath, but suspect the only difference is either some FETS missing, firmware or a very slight difference with a resistor/pin pacing on the board. I did send them a message to ask how I tell the difference and strangely enough they did not respond.

They are cheaper via Aliexpress.....

Would be interesting to find out the difference especially if its just the mosfets and ive not bought anything off aliexpress ive been wary of buying from abroad since I bought a phone from GearBest and got stung for customs charges.
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#13
Will have a look when I install the next unit. I think it was the FET's in the back as they seem a pain to get to as they use the aluminium case for cooling so if you mount the case on a sheet of aluminium/steel it helps with the cooling... don't fix them to wood.. Think I have some pictures,



I still have a dispute in progress with Aliexpress - current case of the mysteries of the Chinese postal service and how parcels dissapear or take a very very long time to re-appear.

The parcel was shipped to me and it took just over 24 hours from collection to being on an aeroplane out of China to me, return trip, 7 days missing in a sorting office, on to the next sorting office, 3 days, etc... woder if the return post should have been marked "not from the USA" "No Trump Tariffs" and it might have been given special treatment !!

This is the 60A non MakeSkyBlue PCB


And this is the new one (I ordered a 40A unit) and it is stamped 60A.. I have not tired it yet so it could be 60A or a firmware programmed 40A. If it is a firmware 40A with identical components then it is a very bad sales approach..



Ironically the no-name board has higher voltage rated capacitors, otherwise the board is identical

Appologies about the colours, flourescent mixed with LED mixed with the phone, mixed with the TV screen... the actual colours are the same as the first image..
Chris likes this post
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#14
I was wondering about the colour scheme there Tongue Odd how that works out.

I would say that the cost difference is there for a good reason. Most people would by the 40A. There isn't much of a difference from using 40A components to the 60A version. This makes not on inventory less overhead, but also the tooling to work with the different designs. Then, when someone wants the 60A version, bump the price up and they aren't the wiser. They paid a higher price for a number change. Cha Ching! It happens a lot here in the US.
This is noted that the "fake" one has higher rated caps. Why is that? Because they are basically the same price as the slightly lower rated caps. Only 1 bin of parts. Plus, you don't have to worry about the person who's putting these parts in grabbing the wrong part and slapping it in there. Then blowing the unit up and having to replace under defect for free. Even more Cha Ching in the end.
completelycharged likes this post
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
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#15
From the surface components they are identical (appart from the 1 bin slection - nice one..), underneath there are two sets of parts, larger switching FET's for the coils and 3 other smaller FETS. Can't really see the part numbers as I would need to take the boards out... the only thing I can think of is that they exclude some FETs in the back, which is picked up by the firmware and then limits the power level, so adding more FET's back in might uprate them..

This one on youtube says 40A and inside on the PCB..... 60A.
https://www.youtube.com/watch?v=Oqfz6iNbBCg

This is a full write up and shows the FET's in the back..
https://syonyk.blogspot.com/2018/05/what...d-600.html

Wow... interesting post at the end... someone has done thier own firmware update...
Korishan likes this post
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#16
So you buy the cheaper 40A version, and do the mods to make it a 60A Smile



Read the Blog posting. Interesting overall. Initially, I'd be wary of using such a system, and probably not recommend it, especially after reading his issues. The weird "MPPT" tracking going all wonky every so often.
But then there's the guy who is writing a firmware for it. If he gets that working correctly, and the MPPT functions as expected, and several units can be tied together, this would be a great little MPPT charge controller for a wonderful price.

Will be interesting to see how that project progresses.
completelycharged likes this post
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Dollar Shave Club. Best Razor I've ever used
Certified 18650 Cell Reclamation Technician
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