Une partie de la critique a été traduite automatiquement.
Bon produit, mais ne peut pas fournir un courant de charge de 5A, à moins qu'il n'y ait un dissipateur de chaleur approprié sur les deux diodes et les deux mosfets. Cela peut aussi être dû au fait que RCS est plus grand que 0.04Ω. Dans tous les cas, le dissipateur de chaleur existant n'est pas correctement collé sous les composants, car il ne touche que partiellement certaines parties chauffées. Pire encore, le dissipateur de chaleur métallique touche les goupilles de certains autres composants et il y a danger de shorts et de dommages. En outre, dans mon unité, le double led est soudé dans l'autre sens, et en conséquence, quand il charge une batterie, le led bleu est allumé, et quand la batterie est pleine, le led rouge s'allume. Néanmoins, c'est un bon chargeur mppt. Je joins le profil de charge et son diagramme, tirés de la feuille de données CN3722.
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.