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Old 24th December 2013, 06:38 PM   #1
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Default High power (upto 1000W@8ohms) from batterys?

Hi guys,

Im a newbie here but ive been browsing the forum for a while now, im building a fairly high output bike trailer soundsystem and im looking for an amp board that is bridgeable to give upto 1000W at 8ohms running from a battery supply. I cant seem to find many options, most higher power boards require a +/- supply, the best i could find was the Sure TAS5630 board but it only gives about 200W at 8 ohms.

Has anyone got any suggestions?

Many thanks

James
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Old 24th December 2013, 07:27 PM   #2
tinitus is offline tinitus  Europe
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12V DC Switching Power Supply - 500 Watt - Car Audio - Power Supplies

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Old 24th December 2013, 07:31 PM   #3
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You're going to need some BIG batteries for that kind of power output. You'll need a bank of 12 volt batteries (in parallel) to provide enough current for such an amplifier.
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Old 24th December 2013, 07:59 PM   #4
tinitus is offline tinitus  Europe
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and remember, car batteries are special start batteries

they only like to deliver power when fully charged, and will be damaged if not
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Old 24th December 2013, 08:09 PM   #5
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You'll need 'deep discharge' batteries. Not standard automotive batteries.
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Old 24th December 2013, 09:41 PM   #6
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Instead of paralleling 12V batteries + adding a car amp PSU it is more suitfuil to connect the required number of batteries in series to achive the required voltage. No matter if you are heading for a single rail or +/- supply.

In the year 2013 for such applications lead type batteries are a stone age choice.
My preference is clearly LiFePO4 with a proper BMS.
Brands like Headway offer also respectable cell sizes like used in e-bikes.
BMS means battery management system and should include a balancer+overcharge protection+deep discharge protection.

General note:
Adressing such power as a newbie in a DIY system typically leads to more or less expensive accidents. Be ready for the fight and be ready to pay for gaining experience. Consider safety precautions. Never give up.
If you just want a fast and cheap success - better don't start at all.
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Old 24th December 2013, 09:59 PM   #7
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The problem with charging several batteries in series off the bike's alternator is not possible and therefor the second post from Tinitus is probably the most suitable.

In stead of building DC to DC converter the simplest is to buy a 12VDC to 120VAC 1000 watt inverter for $150 and rectify the output and centre tap the output transformer at half potential, then you end up with a 60V - 0 - 60V rms power supply, this would equate to a 82 + 82 VDC supply maybe still a bit short but close to what is required for ar 1000 watt amp.
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Last edited by Nico Ras; 24th December 2013 at 10:05 PM.
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Old 24th December 2013, 10:03 PM   #8
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Quote:
Originally Posted by ChocoHolic View Post
If you just want a fast and cheap success - better don't start at all.
Or as the old saying goes: to get to be almost a millionaire out of selling audio equipment all you need is to have two millions to start with.
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Old 24th December 2013, 10:12 PM   #9
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..charging batteries for a 1kW amp from the alternator of the bicycle... ??

Sorry, I have to step out here.
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Old 24th December 2013, 10:18 PM   #10
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Thanks guys, This is for a push bike trailer not a motor bike, ive been considering LiFePO4 cells, but its more likely to be SLA/gel batterys, it depends on how much power is possable though, i havent found a cost effective solution that will give more than 200W@8ohms and if thats all i can get then i might opt for LiFePO4 cells.

Any suggetions on amp boards? Im not overly keen on using a dc-dc covertor due to the power loss, i would prefer to use multiple batterys.

Cheers guys.
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