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Slightly perplexing solar MPPT lithium charger (Patreon)

Published:
2024-04-26 23:58:01
Imported:
2024-05

Content

I think they've really just thrown the acronym MPPT into the mix as a stunt here, as I don't really see how this chip can actually do that.

I'll have to do some side by side tests between this module and a classic TP4056 one.

https://youtu.be/1JLuR6LO3Eo

Files

Solar "MPPT" lithium cell charge module

I started off feeling quite enthusiastic about this new and interesting integrated circuit. But after a bit of exploration I'm not sure it's any better than the classic TP4056 type chip. The promise of adjustable charge voltage threshold was dashed when it turned out you can only adjust it upwards. Especially when the block diagram hints at a more versatile option. It's notable that it has much lower tolerance of overvoltage on the solar panel input (6V) than the classic TP4056 (8V). If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:- https://www.bigclive.com/coffee.htm This also keeps the channel independent of YouTube's algorithm quirks, allowing it to be a bit more dangerous and naughty. #ElectronicsCreators

Comments

Charles

The manufacturer appears to have another model that actually does do MPPT, and for which the output voltage in the constant-voltage phase can be adjusted up OR down - and up high enough to charge multiple cells in series. It's the CN3722. http://www.consonance-elec.com/en/static/upload/file/20231218/1702868102946736.pdf

Muxer Baker

I've tried the TP4056 as a solar charger. It was in Ireland, the fluctuation on the input voltage as clouds went over etc drove it mad. The charge indicators would do wild things. It would just then crash. Plenty of YouTube videos saying to do it, but it doesn't work. This was for a 6V6A array I set up for my garden lights. I ended up just using DW01As and then a bunch of 18650s in parallel to try and get the termination voltage as high as possible. Worked perfectly.