which battery to wire too

[taintedplay 10+ year member]

ok my current system is front batt -> backbatt1 -> backbatt2. does it matter which of the back batteries my amps wire to? does it have to be the last in line or can it be the one in the middle

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[goose5741 10+ year member]

Assuming your batteries are all connected in parallel (like they should be) it really shouldn't matter, its all the same node.

 

[taintedplay 10+ year member]

kk cool. and yes their in parallel

 

[MakeshiftAudio 10+ year member]

I hope he doesn't connect them in series, that would be fun to watch. xD The fets could handle it, but the drivers couldn't. When you increase voltage like that, the driver voltages change, and ofted the comparater power supplies change from ±15V to ±25V or more. The PWM drivers and comparators cannot handle that much voltage, and they fry. A fun idea I had was to use a 15V 3A voltage regulator pair (7815 and 7915, I forget the prefix) and feed it right from the what-used-to-be ±15V rails from the transfomer after it's been rectified and filtered to power the vregs, so it would generally regulate it if it is above 17-18V all the way up to 30V. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif So the driver gets the right voltage, has a common ground, and is allowed to run at extreme voltages like such. This can only work if the mosfets/igbts can handle it. (At some point, due to the LV SMPS power requirements, I move to IGBTs rather than mosfets.)

I have only done this to one amp, and it works pretty well, though I stopped using it due to it getting replaced, since I was running it on 24V, requiring 2 batteries to get this upgraded output. I just put in a 2kW amp in place that ran on a 14V system. xD

Oh, by the way, I had to put a bigger torroid on it. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif It was saturating like no other. This usually discourages people from doing it.

Cliffs:

I hope you're paralling them, and not in series like it seems in the OP. It will destroy things. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

 

[taintedplay 10+ year member]

parallel.

 

[goose5741 10+ year member]

I hope he doesn't connect them in series, that would be fun to watch. xD The fets could handle it, but the drivers couldn't. When you increase voltage like that, the driver voltages change, and ofted the comparater power supplies change from ±15V to ±25V or more. The PWM drivers and comparators cannot handle that much voltage, and they fry. A fun idea I had was to use a 15V 3A voltage regulator pair (7815 and 7915, I forget the prefix) and feed it right from the what-used-to-be ±15V rails from the transfomer after it's been rectified and filtered to power the vregs, so it would generally regulate it if it is above 17-18V all the way up to 30V. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif So the driver gets the right voltage, has a common ground, and is allowed to run at extreme voltages like such. This can only work if the mosfets/igbts can handle it. (At some point, due to the LV SMPS power requirements, I move to IGBTs rather than mosfets.)
I have only done this to one amp, and it works pretty well, though I stopped using it due to it getting replaced, since I was running it on 24V, requiring 2 batteries to get this upgraded output. I just put in a 2kW amp in place that ran on a 14V system. xD

Oh, by the way, I had to put a bigger torroid on it. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif It was saturating like no other. This usually discourages people from doing it.

Cliffs:

I hope you're paralling them, and not in series like it seems in the OP. It will destroy things. //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

AHH I'm getting to the point in school where I understand most of what you just said, 1 more year and i'll be able to have a lot more fun with amps //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif. (2nd year EE)