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Is MakeSkyBlue MPPT solar worth it?
#1
Hi guys.
I'm looking for a good but cheap charge controller for my diy 18650 power wall 7s (29.4) 4kw. I want something that have user-defined parameters.
I'm thinking of make skyblue mppt charge controller. I don't know if they work as advertised.

"MakeSkyBlue MPPT Solar Charge Controller for 12V 24V 36V 48V 72V 96V AGM Lifepo4 Lithium Battery Not PWM Charger Regulator"
http://s.click.aliexpress.com/e/bIaW64a4
Thank you
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#2
Never used one but many i've seen have been happy with them.
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#3
I have 3 of them and they are working great for me.
Tracking seems to be pretty quick and I am happy with them so far.
The only thing is they don't talk to each other so even though they are set up the same there is always one that will take the lead.
That should change once I am Li based instead of Pb The 40A one is for a 12V 650Ah AGM battery set and the 50A ones are for my 48V 250Ah Pb deep cycle battery bank picture taken in the afternoon 4.25 PM overcast.



On a good day I can get quite some amperage out of them. I bought them twice the rating that I needed Just because they are chinese.


To be able to use heavier wire with the 2 contacts rater than run 2 wires I used a round terminal end and cut the end off to give me 2 spades to slide in and tighten.


Wolf
valueseek and Redpacket like this post
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
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Cells ≥2200mAh & ≥ 80% & ≤75mΩ    2800 +236
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#4
They are ok as long as you have the later firmware builds. I have 3 of them hooked up to 7kW of solar.

The tracking in the earlier models is a bit erratic with cloudy conditions and not really fit for purpose as the tracking get's stuck at a low output. Later firmware corrected this.

Temperature wise they run reasonably cool until you load them up and the internal fan will probably last 3 years tops, so I'm going to end up replacing the fan with an external airflow.

The back of the case is effectively a heatsink so mounting them on a large sheet of alloy or steel helps a lot as your effetively making the whole mount into one big heatsink.

I have had around 95 Amps comming from 3 units (2 x 60A, 1 x 40A) into a 48V battery earlier this month.

With the terminals, the easier option is just split the strands of the cable and share them between the two connectors, way easier, no additional component cost and electrically just as good..


Beware though as there are at least 3 different manufacturers of them... check the adverts and sellers. Original boards are marked internally. Check the firmware is possible.
Redpacket likes this post
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
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#5
Thank you very much much.
It helps alot
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#6
(04-20-2019, 08:08 AM)Idiwzr Wrote: Thank you very much much.
It helps alot

I have a frimware 133 is there any way to upgrade a later version?
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#7
So does v118 have the later firmware? Is that the difference between v117 and v118?


The controllers in the link the OP posted are sold by MakeSkyBlue factory store so they should be genuine right?
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#8
MakeSky are the original units and the copies are made by downloading the firmware via the connector internally and ripping off the design.

The earlier firmware has a slower traking method, which could hold the output low (trapped into thinking shading was dropping the output) and also a rather strange instance the other day with the output oscilating by about 900W from one unit when it was doing about 2.8kW. This was a MakeSky with older firmware.

The other advantage these units have is they can accept a higher voltage (quotes of 180V I think - check before you try!!!!) so it allows for 4 x 260W panels (37Voc) on my units.

The copies are cheaper with a few cheaper parts, but otherwise run ok, the horrible little fans in all the units start to vibrate because the bearings have worn loose after less than a year. On the project list was to re-mount all the units onto a separate bar to act as a larger heat sink and remove the fans, but that might never occur as I may end up reverting back to a grid tie inverter for the majority of the solar output (charging via separate method).
If you can't quantify how much they cost, it's a deal, I'll buy 5 of them for 3 lumps of rocking horse ......
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