just wondering if its possible to run a sub and amp with a dynamo or would it just be too much for the battery, not keen on a alternator convertion as ive just changed the dynamo, failing that i could just fit it in the golf...
amp and sub with a dynamo
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amp and sub with a dynamo
by herbie » Tue Jul 20, 2010 2:06 pm
hi guys,
just wondering if its possible to run a sub and amp with a dynamo or would it just be too much for the battery, not keen on a alternator convertion as ive just changed the dynamo, failing that i could just fit it in the golf...
just wondering if its possible to run a sub and amp with a dynamo or would it just be too much for the battery, not keen on a alternator convertion as ive just changed the dynamo, failing that i could just fit it in the golf...
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herbie - Posts:
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Re: amp and sub with a dynamo
by Tommy D » Tue Jul 20, 2010 2:46 pm
i used to run a big amp and 2 subs on a dynamo, no problems in 2 years 
alternator conversion is a doddle!
alternator conversion is a doddle!
Caddy driver....
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Tommy D - Posts:
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Re: amp and sub with a dynamo
by jerrythegerman » Tue Jul 27, 2010 6:39 pm
Depends how big the amp is really, if it's mega watt's I'd be changing or rev the bollocks of it all the time to keep the charge voltage up!!
If it's a cheaper brand (nowt wrong with those before someone start's to rant!!) it's all a bit of badge engineering really. Big stickers saying "12kw hypersound" and all that bobbins in reality means it's prob about 100w and distorts like a good en when you wow it up as the cheap chips start "clipping" the signal. Despite what anyone tells you, 100 Watts, RMS is plenty of power. To give you an idea, your average radio transmitter for Radio 1 would be a output of around 50w!!
To work it out, multiply the power (these are almost always quoted as peak to impress the boy racers) by .7, this will give you a rough guide to the RMS power. Divide that by 12 and this will give the maximum amount of current used. If it's more than the dynamo creates at full charge, you could run into trouble after multiple short trip's, wipers on, light's on...basically winter driving. The battery wont be getting enough charge to enable it to always start. Alt's give a consistant charge from low rev's, you have to make sure the dynamo is spinning a fair bit to do the same. It's said that it roughly takes 7 mins of running on a alt car to replace the power consumed on a cold start and that's without anything else electrical running.
Keep your eye on the charge light and see how it goes, serious stuff need's a alt and a decent battery.
If it's a cheaper brand (nowt wrong with those before someone start's to rant!!) it's all a bit of badge engineering really. Big stickers saying "12kw hypersound" and all that bobbins in reality means it's prob about 100w and distorts like a good en when you wow it up as the cheap chips start "clipping" the signal. Despite what anyone tells you, 100 Watts, RMS is plenty of power. To give you an idea, your average radio transmitter for Radio 1 would be a output of around 50w!!
To work it out, multiply the power (these are almost always quoted as peak to impress the boy racers) by .7, this will give you a rough guide to the RMS power. Divide that by 12 and this will give the maximum amount of current used. If it's more than the dynamo creates at full charge, you could run into trouble after multiple short trip's, wipers on, light's on...basically winter driving. The battery wont be getting enough charge to enable it to always start. Alt's give a consistant charge from low rev's, you have to make sure the dynamo is spinning a fair bit to do the same. It's said that it roughly takes 7 mins of running on a alt car to replace the power consumed on a cold start and that's without anything else electrical running.
Keep your eye on the charge light and see how it goes, serious stuff need's a alt and a decent battery.
"It's rust Jim, but not as we know it"
"I hate those chuffin rice racers, bit too "Fast and the Furious" for me. The only thing they do really quickly is rot and even that aint fast enough as far as I'm concerened".
"I hate those chuffin rice racers, bit too "Fast and the Furious" for me. The only thing they do really quickly is rot and even that aint fast enough as far as I'm concerened".
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jerrythegerman - Posts:
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Re: amp and sub with a dynamo
by herbie » Wed Jul 28, 2010 3:07 pm
cheers for all the info guys
spoke to the fella installing it and he said, he wouldn't do it
so it went in the golf instead, just in time for bug jam hooray!!!!
spoke to the fella installing it and he said, he wouldn't do it
so it went in the golf instead, just in time for bug jam hooray!!!!-
herbie - Posts:
33 - Joined:
Sun Feb 21, 2010 5:39 pm - Current Vehicle:
golf 1.8t & 1972 beetle (herbie decals) - Location:
warrington
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