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35% OFF MPPT 5A Solarmodulregler Batterieladungsregler 9V 12V 24V Automatischer Schalter US$10.99 US$16.99 View It

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MrBungle 20/01/2019

This device works quite well at lower currents (< 3A). MPPT via panel voltage tracking seems to work quite well. I have mine outputting an almost consistant 10 Watts(2.8A @ 3.6v) into a 1s20p Lithium battery(nom. 3.6v, 45Ah) from a 12.5 Watt panel (21Voc, 17Vmp), so approx. 80% efficiency, even in 42 degree celcius ambient heat with panel temperature above 60 deg C !! (Australian summer). In 'cooler' summer weather (mid 20's) I get maybe an extra Watt out at mid day (~11W -ish). Although this is advertised as working up to 5A, even after extensive testing I was not able to get much above 4A with a 25Watt(measured) panel and very good heatsinking: I only get 15 Watts out (4.2A@3.6v) so efficiency at higher currents suffers badly (25W in, 15W out = ~60% efficiency) This item, as shipped, will NOT work with 1S lithium because the regulation voltage can only be adjusted down to ~6.5v, however, it is relatively easy to modify it for 1S operation. To do this, simply replace the 22k resistor (R7, marked 223, 0603 size) with something around 75k to 100k. I used an 82k resistor which alows me to adjust regulation from ~3.0v to ~9v. Note that the supplied heatsink itself is okay, but it is useless as supplied because it is mounted with a thick dob of silicone adhesive. This is because A) the current sense shunt resistor is thru-hole and protrudes, and B) the PCB tracks under it have exposed solder pads. Poor design/lack of forethought by whoever did the PCB layout!. Therefore, mounting the heatsink directly to the PCB would cause a short circuit. I have modified mine with heatsinks on the top side packages(Mosfets and Diodes), and also a heatsink with a drilled hole (to clear the shunt solder pad) un the underside using double-sided tape as insulation to avoid shorts with the board tracks. Not exactly ideal, but much better than as-supplied.

Kommentar (4)

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Banggood Dear MrBungle,, Thank you for placing an order on Banggood and we hope you will enjoy the products you bought. If you have any further questions or suggestions, please do not hesitate to contact us at below links: Personal Computer: http://www.banggood.com/Contact-Us_hi111 Mobile: https://m.banggood.com/contact_us.html Best regards, Banggood Team
04/05/2024

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c4xp Youare my brother from another mother :) I had the exact same modifications done.
Antwort 26/02/2019

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olonsoft Iused a 33K resistor for R7 and so I could adjust from 4.02V to 18.68V. Much better because I can use 1S - 4S batteries.
Antwort 31/07/2019

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goatzilla Couldyou please describe how to calibrate this thing? The Engrish instructions are... not helpful.

I only see two pots, but there need to be three parameters adjusted: MPPT level, charge termination level, and charge current.

The instructions seem to indicate that the two pots (neither of which are labeled) might be a "coarse" and a "fine", and you set each parameter independently based on what's connected at the time.
Antwort 20/11/2019

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Kontaktieren Sie uns Anleitung für neue Benutzer Hilfezentrum Spezialisierte Angelegenheiten

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