Certamente sapete che le batterie al litio sono utilizzate per un lungo periodo devono essere stoccate a circa il 50% della loro capacità per preservarne a lungo ed evitare eventuali problemi anche di incendio ed esplosione. Con questo meccanismo ho risolto il problema perché con un rapido collegamento ai vari contenitori delle batterie posso scegliere di quando caricarle verificando la carica con un normale misuratore. Questo consente di non dover tenere accesi i dispositivi che li contengono per scaricarle cosa non sempre agevole e non sempre comodo.Se questa recensione sarà ritenuta interessante provvederò a pubblicare un'altra recensione sul sistema che utilizzo per verificare la scarica effettuata da questo strumento.

Articolo super preciso, si può regolare l'assorbimento da 0 a 3A a passo da 10mA. La ventola si accende da sola se si scalda troppo, di solito intorno ai 5W. Ha senso solo se comprato insieme ad un misuratore di corrente. Lo uso per testare potenza e capacità dei Powerbank.

This is an inexpensive constant current load for testing the output of power banks and USB chargers. Unlike more costly ones it does not have a display to show you what current is being drawn and therefore needs to be connected via a USB volt/ammeter like the FNB58.Mine worked very well until I used it to fully discharge a 20,000mAh power bank at the CC load’s maximum current. Part way through the discharge it stopped working.I removed the power transistor (TIP122) and tested it, but it was OK. Whilst doing this I noticed there was no heat-sink compound under the transistor, so I added some before soldering it back.hI eventually discovered the fault was caused by the USB-A plug overheating. This had allowed the contact to sink into the plastic where is set in place never to make contact again.If USB devices are going to be delivering substantially more power than originally envisage it is vital that the plugs and sockets can carry the current without melting. It would be far more serious if the plug that failed was built into an expensive device like a laptop as opposed to bare PCB on an inexpensive testing device.I replaced the faulty, board-mounted plug, with a USB lead soldered to the “+” and “-“ pads and the constant current load works perfectly again.Two of these have now failed because the USB plug melted at currents below the maximum. I have added photographs of how to repair them with an old USB lead.

Useful little gadget for testing unknown USB power supplies for quality and fitness for purpose. You will need one of those USB meters to go with it though as there isn't one built in on this like there is on some. I've tried it out on a few different USB mains adapters, slowly increasing the current to the maximum on their rating labels and watching the voltage and current on the meter to be sure they stay within acceptable parameters. I've found on good ones the voltage never drops below 5V, whereas on the dodgy ones it can fall below 5V long before the current shown on its label is reached.

Funktioniert gut

Acquistato come carico per testare dei power banks con un multimetro USB. Può essere regolato nell'assorbimento. La ventola inizialmente abbastanza silenziosa dopo qualche ora forse è diventata leggermente più sibilante ma potrei sbagliarmi. Un po' grezzo non avendo uno chassis che protegge la circuiteria ma immagino che non sia destinato all'utente comune, inoltre questo permette una migliore dissipazione del calore generato.

Für 9 Euro hatte ich nicht soviel Liebe zum Detail erwartet, die findet man aber bei diesem kleinen Tool durchaus.Erst mal kann man wirklich sehr fein den Laststrom an einem 10-Gang-Poti einstellen, das mit einer äußerst praktischen Messingverlängerung ausgestattet ist. Kein Schraubenzieher o.ä. nötig, einfach mit den Fingern drehen geht gut. Schon mal toll. Der eingestellte Strom bleibt auch gut stabil, auch wenn sich die Spannung leicht ändert. Klar, sollte auch so sein, aber wie gesagt, für 9€ gehts auch schlechter.Noch toller aber finde ich den Lüfter. Normalerweise hält man so kleine 'Quirls' nicht im gleichen Raum aus. Nicht so hier! Der Lüfter ist proportional zur erzeugten Verlustleistung drehzahlgeregelt. Bis ca. 500mA Last läuft er gar nicht, dann bis ca. 1A läuft er zwar an, ist aber kaum zu hören, da er relativ langsam läuft. Bei 2A für 30 min., immerhin 10 Watt die 'vernichtet' werden müssen, hört man ihn zwar, er ist aber immer noch nicht unangenehm laut. Die vollen 15 Watt hab ich noch nicht getestet, bei 5V (meine Anwendung) sind 3A eher selten per USB-Stecker.Fazit: klare Kaufempfehlung, ich hohl mir auf jeden Fall gleich noch einen.

I plugged it into an 2000ma usb power adaptor and it shut down.I found out the usb load adjuster was set to over 2000ma and had to turn the adjustment counter clockwise to reduce the load the load and now it works fine.I have tested it up to 3000ma and it works fine, the fan turns off and on to keep it cool.It comes in a silver anti-static bag with no instruction though it needs none as it only has one adjustment.NEW: There is no thermal grease between the regulator and the heatsink at least on my version so i added some and the fan comes on a lot later now.