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Bluetooth Speaker Midrange Tweeter Subwoofer
Bluetooth Speaker Midrange Tweeter Subwoofer
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Old 24th August 2019, 06:37 PM   #1
JendoRiot is offline JendoRiot
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Default Bluetooth Speaker Midrange Tweeter Subwoofer

I have a BTR Portable 48V 10Ah Battery Pack that will power Nobsound TAS5630 2.1 Channel Class D Amplifier Board. My understanding is that I will need to feed the amplifier with 48V and 10-15Amps in order to get the most out of my speakers. I am trying to find a ON / OFF switch and I believe the switch itself should be rated for 48V and 10-15Amps, but I cannot find one. Any thoughts?


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Old 29th August 2019, 08:35 PM   #2
Mark Tillotson is offline Mark Tillotson
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Location: Cambridge UK
Few switches are rated for higher than 24Vdc, partly because that's the common case
(12V cars, 24V lorries/boats/aircraft). Large DC voltages are hard to switch as there's
no zero-current point to quench the arc, and if lots of power is being interrupted the arc
can grow large enough to short out the switch terminals completely - a fireball.

Try searching for "DC contactor" rather than "switch". Often its easiest to use something
solid-state to do the switching as no arc problem exists (for instance a DC SSR could be used).

Some of the physically large switches might be OK at 48V and 15A, you'd have to experiment a bit, large size means better arc quenching behaviour, but the higher the DC voltage the greater the problems. You'll need a dummy DC load that handles the full current to test the switch, which is easy if you happen to have a 4 ohm audio dummy load rated at 600W kicking around, otherwise tricky!
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Old 29th August 2019, 09:38 PM   #3
PRR is offline PRR  United States
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Location: Maine USA
If you turn-off with the speaker silent, the current will be very low. When playing, the peak 13 Amps current will only be on musical peaks, the average will be under 2 Amps.

Ordinary home light-switches will handle this (DC) abuse many-many times. A pack of 10 is $10 so replace when needed.

As Mark says, breaking DC under load is liable to arc forever and burn the switch. Turn down before you turn-off.

Heavy-duty toggle switches rated 10A 250VAC will handle this OK. Get a 2-pack so if life is exceptionally short you are covered while you buy more or something else.
Amazon.com: DPDT Heavy Duty Toggle Switch - Spade Connectors: Car Electronics

Car/truck/boat battery cutoff switches WILL break this load.
Amazon.com: MagiDeal 100AMP Car Truck Boat Battery Disconnect Power Isolator Cut Off Kill Switch: Automotive

Last edited by PRR; 29th August 2019 at 09:42 PM.
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