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Your cart is empty.The TM-522-D is a premium quality solar charge controller kit that is for 12V / 12.8V batteries (Duo technology). This kit includes: 1) OptiMATE Solar DUO controller 2) O-27 SAE polarity converter 3) O-01 battery lead 4) O-04 battery clips. The TM-522-D Works with 12V polycrystalline or mono-crystalline solar panels, with rated output from 10W to 60W. The Solar Panel requirements also include: Vnom (nominal voltage panel is designed for) at 12V, Vmp (max. power voltage) at 17V, & Voc (max. open voltage) at 25V. Fully automatic ‘connect & forget’ technology!
JC
Reviewed in the United States on October 2, 2022
If you're looking for a 5A charger, this is not it. Above 1.5A, it goes into pulse mode and actually charges slower. Nothing inside is getting warm, let alone hot. I'm sure it'd be fine with 3-5A continuous. No idea why they sabotaged their own product like this.At the rated 60w, it goes way over what voltage should be during the absorption charge phase. The absorption phase has a fixed minimum pulse width, and a fixed voltage it starts at (~14.15v on mine). With a solar panel supplying 4A (56w at 14v supply), going to a new 55Ah size 78 AGM car battery, the battery goes up to 14.9v on the pulses. This should be more like 14.4v.The manual says when it powers up it'll check if the battery is charged. If so, it won't do the absorption charge. This is not the case for mine. Even when it just finished a cycle, you can shade the solar panel, it restarts, and every single time it goes into absorption charge mode. So it overcharges the battery (see above line) for 10 minutes every time it loses power or gets too shady.In one instance where I charge the battery, then shaded the cells for only a few seconds then restarted charge, the charger thought my AGM lead acid was a LiFePO4 and tried to overcharge it even worse.It has Changx and other no-name junk components inside. There is an EEVBlog post about how terrible these capacitors are.Basically I don't trust this without having a multimeter on it, which completely defeats its purpose. With a solar panel and a multimeter I can manually charge way better than this thing does. For this price, this should have a MUCH less terrible charge profile/full battery detection and use name brand components. At one point I thought optimate was a good brand, but the last 2 things I've bought from them have been similarly garbage.2 stars for it's probably better than nothing for low-reliability applications where you want the battery charged but if it does it's not a huge deal, and if it's life is slightly shorted from overcharging it's also not a big deal. But for less $ you can get something else equally crappy. Hopefully higher quality exists somewhere..
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