(I am putting this thread in here as this involves car audio amplifiers and car voltages, but the amplifier is not going to be used in a car but just used standalone.)
I want to power a small 100 watt RMS 12v car amplifier using lithium ion batteries, to wirelessly drive a bass shaker on a computer chair with casters, so that I am not constantly running over the power wires to the shaker.
Is there a product available that already does this without me needing to hack something together myself? Personally I'd like to have something sophisticated with a battery temp monitor for charging each cell, so the batteries don't blow up or melt while charging, or if the sun is shining on the battery packs, etc.
It's difficult to talk about this with precision, since lead acid batteries are nominally 13.6v charged, and a vehicle charging system voltage can be 15-16v or so.
Meanwhile lithium batteries average about 3.6 to 3.7 volts fully charged, so four of them in series is 14.4 to 14.8 volts. As such, the full charge voltage is a bit high vs lead-acid, but this is nominally in a compatible range with what an amplifier would see, installed in a car with the charging system active.
The problem is charging the packs in series without disconnecting them from the circuit, and without the amplifier seeing the total charge voltage. Apparently the fully charged voltage is 4.2v per cell which for four is 16.4 volts. This sounds like it is dangerously close to the voltage limit for a car amplifier.
I'd like charging to be as simple as "plug it in and it just does it", but would it be better to install an On/On DPDT switch to fully isolate the charging circuit from powering the car amplifier?
I want to power a small 100 watt RMS 12v car amplifier using lithium ion batteries, to wirelessly drive a bass shaker on a computer chair with casters, so that I am not constantly running over the power wires to the shaker.
Is there a product available that already does this without me needing to hack something together myself? Personally I'd like to have something sophisticated with a battery temp monitor for charging each cell, so the batteries don't blow up or melt while charging, or if the sun is shining on the battery packs, etc.
It's difficult to talk about this with precision, since lead acid batteries are nominally 13.6v charged, and a vehicle charging system voltage can be 15-16v or so.
Meanwhile lithium batteries average about 3.6 to 3.7 volts fully charged, so four of them in series is 14.4 to 14.8 volts. As such, the full charge voltage is a bit high vs lead-acid, but this is nominally in a compatible range with what an amplifier would see, installed in a car with the charging system active.
The problem is charging the packs in series without disconnecting them from the circuit, and without the amplifier seeing the total charge voltage. Apparently the fully charged voltage is 4.2v per cell which for four is 16.4 volts. This sounds like it is dangerously close to the voltage limit for a car amplifier.
I'd like charging to be as simple as "plug it in and it just does it", but would it be better to install an On/On DPDT switch to fully isolate the charging circuit from powering the car amplifier?