Daniel Brill-Edwards Posted December 3, 2014 Report Share Posted December 3, 2014 Hi guys I'm planning on putting a CT sounds 7k on my SMD and just working out my battery options. The car is a MK3 golf which is extremely limited on storage space compared to you guys in the states. The floorpan layout has the fuel tank underneath the spare wheel well which results in is being a space saver size. There is a void underneath the back bench and I am planning a drop through battery box. I have already bought a D3100 which would fit nicely underneath and I'm just trying to work out the reserve I will need. I have space for a D925 underneath the box in the wheel well and space in the engine bay for another D3100 but i'm just wondering whether to put a D7500 in the battery tray or try to squeeze 2 D3100s in. The charging system will be 2 210amp alts with 4 runs of + and 4 of - all knukonceptz 1/0 OFC so that is plenty specced for the amount of power but I was worried that the battery bank would not be big enough for the instant draw. What I could see happening is the voltage bouncing round as the current draws off the battery and then is kept up by the 400+ amps from the alts. Options: 1. D3100 up front (kind of seems wasted up there as it can put out so much current) D3100 in the battery tray Possibly 1/2 D925s under the box 2. D3100 up front D7500 in battery tray 3. Normal battery up front 2x D3100s in the battery tray (not sure if this will fit yet) 4. Normal battery up front D3100 in battery tray 1/2 D925s under the box What are your thoughts? Daniel Brill-Edwards - Representing English Bassheads!!Old Build Log - http://www.stevemeadedesigns.com/board/topic/94637-vw-golf-mk3-1996-build-from-england/ New build coming soon with SMD V1 #99YouTube Channel - http://www.youtube.com/brilledwards Link to comment Share on other sites More sharing options...
gckless Posted December 3, 2014 Report Share Posted December 3, 2014 Can fit ultracaps in some places batteries won't fit. Could lay them flat for example. You have a good amount of charging so they would be useful. "Clipping" is the biggest forum boner now. It's like witchcraft... it automatically explains just about everything people don't understand. My build log: http://www.stevemeadedesigns.com/board/topic/200295-gckless-2011-chevrolet-impala/ High resolution photos: Gilbert Kless Photography Link to comment Share on other sites More sharing options...
Daniel Brill-Edwards Posted December 3, 2014 Author Report Share Posted December 3, 2014 Can fit ultracaps in some places batteries won't fit. Could lay them flat for example. You have a good amount of charging so they would be useful. They do sound interesting and I have been looking into them for a while but I don't want to charge to their full levels at risk of damaging the batteries ie 6 caps with a 2.5V limit = 15V If my limit of charging is 14.4 then I am wasting some headroom that the caps provide I could maybe look at the brand new 2.85V caps as 5 of those is 14.25V but the cost of several banks would get a bit mad! It's certainly on the list of ideas for improvements once I see what the system is like Daniel Brill-Edwards - Representing English Bassheads!!Old Build Log - http://www.stevemeadedesigns.com/board/topic/94637-vw-golf-mk3-1996-build-from-england/ New build coming soon with SMD V1 #99YouTube Channel - http://www.youtube.com/brilledwards Link to comment Share on other sites More sharing options...
gckless Posted December 3, 2014 Report Share Posted December 3, 2014 Can fit ultracaps in some places batteries won't fit. Could lay them flat for example. You have a good amount of charging so they would be useful. They do sound interesting and I have been looking into them for a while but I don't want to charge to their full levels at risk of damaging the batteries ie 6 caps with a 2.5V limit = 15V If my limit of charging is 14.4 then I am wasting some headroom that the caps provide I could maybe look at the brand new 2.85V caps as 5 of those is 14.25V but the cost of several banks would get a bit mad! It's certainly on the list of ideas for improvements once I see what the system is like I suggest you do a bit of reading on caps. There are a couple lengthy, useful threads here, do a search. They can be used up to their rating, to not exceed it. There's no "wasting headroom" in caps in the terms you are thinking. "Clipping" is the biggest forum boner now. It's like witchcraft... it automatically explains just about everything people don't understand. My build log: http://www.stevemeadedesigns.com/board/topic/200295-gckless-2011-chevrolet-impala/ High resolution photos: Gilbert Kless Photography Link to comment Share on other sites More sharing options...
Daniel Brill-Edwards Posted December 4, 2014 Author Report Share Posted December 4, 2014 Can fit ultracaps in some places batteries won't fit. Could lay them flat for example. You have a good amount of charging so they would be useful. They do sound interesting and I have been looking into them for a while but I don't want to charge to their full levels at risk of damaging the batteries ie 6 caps with a 2.5V limit = 15V If my limit of charging is 14.4 then I am wasting some headroom that the caps provide I could maybe look at the brand new 2.85V caps as 5 of those is 14.25V but the cost of several banks would get a bit mad! It's certainly on the list of ideas for improvements once I see what the system is like I suggest you do a bit of reading on caps. There are a couple lengthy, useful threads here, do a search. They can be used up to their rating, to not exceed it. There's no "wasting headroom" in caps in the terms you are thinking. I just went and reread the good threads and yes I was thinking of them in the wrong way. They could provide the same current at whatever voltage but in my 14.4V application that would mean not using them to the fullest power potential (I could live with that though) I do like the idea of a half battery half cap style system I've just measured up and there's no way 2 D3100s will fit so that's option C out the window. There would be space for 2 banks of 6 caps under the box but I'm not too sure if that would be a good match for a D7500/D3100 Couple of questions though, Since the caps store the charge applied, when the engine is switched off, they will discharge from 14.4 into the batteries. Is there any way to avoid the slow discharge and consequent draw on the batteries? I doubt I'd ever leave my car for a month; I had considered disconnecting the caps but then when you came back you'd have to charge them before reconnecting them. Active vs passive balancing circuits - as far as I'm aware the passive circuit increases the discharge rate?? Logistics - http://www.ebay.co.uk/itm/251472523845? this pack looks OK but with postage from the States and then a 20% tax on all that when it comes into the UK the cost may outweigh the benefits? Daniel Brill-Edwards - Representing English Bassheads!!Old Build Log - http://www.stevemeadedesigns.com/board/topic/94637-vw-golf-mk3-1996-build-from-england/ New build coming soon with SMD V1 #99YouTube Channel - http://www.youtube.com/brilledwards Link to comment Share on other sites More sharing options...
Blockburner Posted December 4, 2014 Report Share Posted December 4, 2014 Juicebox lithium?? one battery takes the place of 3 3100's Team Deadly Hertz Ampere Audio/SHCA/Singer/ XS POWER Link to comment Share on other sites More sharing options...
hispls Posted December 4, 2014 Report Share Posted December 4, 2014 Those 7K amps have a high failure rate as is, and you're considering "how little electrical can I get away with"? This is not likely to end well for you. I hope you bought from a retailer who will honor the warranty. Link to comment Share on other sites More sharing options...
Daniel Brill-Edwards Posted December 4, 2014 Author Report Share Posted December 4, 2014 Those 7K amps have a high failure rate as is, and you're considering "how little electrical can I get away with"? This is not likely to end well for you. I hope you bought from a retailer who will honor the warranty. I'm not considering "how little I can get away with". Far from it, I'm trying to work out how much I can squeeze into a limited space and what combination of batteries will work best Also all the failure rates I have seen mentioned are due to people wiring at half ohm and/or running higher than 14V. The SMD works out to be 0.7 so after box rise, should work nicely Daniel Brill-Edwards - Representing English Bassheads!!Old Build Log - http://www.stevemeadedesigns.com/board/topic/94637-vw-golf-mk3-1996-build-from-england/ New build coming soon with SMD V1 #99YouTube Channel - http://www.youtube.com/brilledwards Link to comment Share on other sites More sharing options...
hdorre Posted December 4, 2014 Report Share Posted December 4, 2014 The SMD works out to be 0.7 so after box rise, should work nicely On 5/8/2011 at 7:38 PM, Kranny said: On 5/8/2011 at 7:35 PM, 'Maxim' said: It hurts me inside when I read stuff like this and remember you're 15 LMFAO so true Mitsubishi 3000GT (Old Build) Headunit: Pioneer 80PRS Frontstage: (2) McLaren Audio MLT-2 Tweeters & (4) PRV Audio MR Series Neo 6.5" Mids Substage: 4 15" Hybrid Subs - Tantric Motors & Sundown Softies Amps: Banda 2.4D Amp (Tweets), American Bass VFL 350.4 (Mids), and (2) Ampere 3800s Electrical :Singer 260A Alt & JY Power Lithium 2005 Chevy Colorado Ext Cab Headunit: Pioneer 80PRS Frontstage: 4 PRV 700Ti Tweets & 6 10" Delta Mids on 3000wrms Substage: 6 Fi BTL 18s in a 4th Order Walkthrough on 3 Wolfram 4500s Electrical: Singer "390" and JY Power My Official Feedback Thread Link to comment Share on other sites More sharing options...
Daniel Brill-Edwards Posted December 4, 2014 Author Report Share Posted December 4, 2014 The SMD works out to be 0.7 so after box rise, should work nicely Erm what's wrong with using the all-encompassing term that covers the impedance rise of the driver in operation due to heat and the box design etc? Daniel Brill-Edwards - Representing English Bassheads!!Old Build Log - http://www.stevemeadedesigns.com/board/topic/94637-vw-golf-mk3-1996-build-from-england/ New build coming soon with SMD V1 #99YouTube Channel - http://www.youtube.com/brilledwards Link to comment Share on other sites More sharing options...
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