Hi everybody,
I want to build an autonomous transportable bluetooth speaker and I want to use a 2.1 amp, it is the TSA7800B amp from Tinyside. I want to power this amp with batteries and I need quite a big capacity so I found the Wondom BCPB4 battery board that I could use with 5S 26650 batteries. But I don't know if this battery board will be compatible with my amp.
If I want a bigger capacity, do you know another solution that I could use ? I know I could build a battery pack with the right number of batteries in series and parallel to reach the desirable voltage and capacity, but I would have to use a BMS to balance the charge of batteries and it scares me as I don't have that much experience in electronics. That's why I would prefer to have a battery board that manages the balance and the charge of batteries, like the BCPB4. Do you have suggestions ?
Thank you very much !
I want to build an autonomous transportable bluetooth speaker and I want to use a 2.1 amp, it is the TSA7800B amp from Tinyside. I want to power this amp with batteries and I need quite a big capacity so I found the Wondom BCPB4 battery board that I could use with 5S 26650 batteries. But I don't know if this battery board will be compatible with my amp.
If I want a bigger capacity, do you know another solution that I could use ? I know I could build a battery pack with the right number of batteries in series and parallel to reach the desirable voltage and capacity, but I would have to use a BMS to balance the charge of batteries and it scares me as I don't have that much experience in electronics. That's why I would prefer to have a battery board that manages the balance and the charge of batteries, like the BCPB4. Do you have suggestions ?
Thank you very much !
This amplifier is said to be based on TPA3116D2 chip. Read the datasheet. It is unknown how much current your speakers will have to draw and this will be supplied by the batteries which should have enough of Ah rating to be able to support that. Otherwise, 5 pieces of 26650 3.7V batteries when fully charged (4,2V) come to about 21V, acceptable to amplifer. Perhaps you could be well served with a 12V battery, but this could be cleared with a test drive, an automobile battery perhaps. The greater the battery capacity (Ah rating) the more current and the longer it will supply the device with power, giving you extended listening sessions.
Hello Lojzek, thanks for the reply !
Yes as you said my biggest problem is to know how much power my loudspeakers will draw. Considering the 5S battery board composed of 5x26650 batteries, I could end up with 5x5x4,2 = 105 Wh of capacity (considering batteries of 5 Ah each). I don't know if 105 Wh would be sufficient or not... maybe if I play music not too loud, the woofers could draw 20 W, and my tweeters 20 W too, this makes 40 W of consumption and 2.5 hours of autonomy. That's not much, but I didn't find a better solution yet
Yes as you said my biggest problem is to know how much power my loudspeakers will draw. Considering the 5S battery board composed of 5x26650 batteries, I could end up with 5x5x4,2 = 105 Wh of capacity (considering batteries of 5 Ah each). I don't know if 105 Wh would be sufficient or not... maybe if I play music not too loud, the woofers could draw 20 W, and my tweeters 20 W too, this makes 40 W of consumption and 2.5 hours of autonomy. That's not much, but I didn't find a better solution yet
Whenever you make a project like this or any other, base your power demand on the woofer cone movement if you wish to save it from being destroyed in the process. Depending on the music style, try not to drive the woofer unit over its Xmax specified value. This is the safe way. It will probably be less than your 40W, which will benefit the battery life and capacity. I would probably acquire a couple of battery packs ( 5 of them in series) and recharge them individually, and replace after being depleated so they would probably last maybe one weekend (2 days=16 hours play time).