BMS = Battery management system?
I assume that is taken care of for the charging part because I would use an original DeWalt charger, so the discharging part would be the concern. Do you have specific examples of what would match a 20V DeWalt battery? It's the first time I hear about this admittedly.
I assume that is taken care of for the charging part because I would use an original DeWalt charger, so the discharging part would be the concern. Do you have specific examples of what would match a 20V DeWalt battery? It's the first time I hear about this admittedly.
Just starting my research on this and it looks like I need more research than I expected.
I could use the 18V adapter that was suggested earlier, but it's quite bulky and also I would lose 2V.
Other than that, I can't seem to find a BMS exactly for 20V. Would something like this work? 5s 18/21v 20a li-ion lithium battery pack battery charging protection board protection circuit board bms module Sale - Banggood.com It says 5S (assuming that the DeWalt is a 5-cell) but I'm not sure if I need to look at something else. If this worked it owuld be perfect for the size of my project.
Would this allow me to charge the battery while on the sound system by applying a 20V supply?
Model #2, mono, with TI TPA2118, Dayton Audio 99dB full-range and 20V DeWalt battery + external supply port.
I haven't wired the battery yet because I'm waiting the battery protection circuit to arrive, but with a 20V input from an external adapter this is WAY loud. Not the same audio quality as the Alpair, but that's a tradeoff. This is mostly for getting people up and dance.
Next will be finding out how long the battery will last at high volume.
I haven't wired the battery yet because I'm waiting the battery protection circuit to arrive, but with a 20V input from an external adapter this is WAY loud. Not the same audio quality as the Alpair, but that's a tradeoff. This is mostly for getting people up and dance.
Next will be finding out how long the battery will last at high volume.
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Can you explain that? I found this very small BMS IC but it came with no instructions. It has B+, B-, C+, P+, P-, B2, B3, B4 contacts. B+ is connected to P+, and B- to the charging jack negative.
B+ and B- go to the battery poles. I got that far. From schematics of other 5S BMS models it looks like both the load and the supply go on the same contacts, but this one has C+ (and C-, unmarked) on the supply jack as well as P+ and P-. None of these has any voltage if I connect the battery to B+ and B-
Apparently B2-B4 should go to intermediate taps, which I assume are the other connections in the battery (measuring with a multimeter they yield lower voltages). Are these the "balancing" contacts? Do I only need them for charging (my adapter doesn't have contacts for these so it would be hard to use them)?
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Take three. This may not be the Holy Grail of boom boxes but it's quite a party monster.
I haven't found a better speaker than the Dayton Audio (except for very expensive 8" that require huge cabinets) or a better amp, so I built it upon the components of version #2. I made a larger enclosure based on a B4 harmonic for better bass, and more room for goodies inside. I also replaced the 18V power tool battery with an embedded, home made 22V power pack.
I also added a Raspberry Pi Zero W powered from the battery pack through a DC-DC converter so that I can use the boom box as a music server and a hotspot. It is not connected nor configured yet (photos show just the placement)—even tether to my cell phone connection and stream from Internet music services! That's for later.
I haven't found a better speaker than the Dayton Audio (except for very expensive 8" that require huge cabinets) or a better amp, so I built it upon the components of version #2. I made a larger enclosure based on a B4 harmonic for better bass, and more room for goodies inside. I also replaced the 18V power tool battery with an embedded, home made 22V power pack.
I also added a Raspberry Pi Zero W powered from the battery pack through a DC-DC converter so that I can use the boom box as a music server and a hotspot. It is not connected nor configured yet (photos show just the placement)—even tether to my cell phone connection and stream from Internet music services! That's for later.
