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24v Large Super Capacitors

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valve head777 View Drop Down
Young Croc
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Joined: 27 July 2012
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2016 at 6:07pm
Cable size issue not site issue.
Welding cable is quite happy at 2-300 amp, and is expensive. Really do not think its that which is your issue. Try to stuff as many amps it
into your bank as you can initialy too. Maybe combine 240v inverter charge with your panels.. Also consider splitting the bank to 12v blocks, or if you can 6v blocks as you can compare which cells takemore/less time to charge. It seems like an expensive punt on copper to see if that makes a difference.
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Phil B View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil B Quote  Post ReplyReply Direct Link To This Post Posted: 12 December 2016 at 10:30am
Originally posted by valve head777 valve head777 wrote:

Cable size issue not site issue.
Welding cable is quite happy at 2-300 amp, and is expensive. Really do not think its that which is your issue. Try to stuff as many amps it
into your bank as you can initialy too. Maybe combine 240v inverter charge with your panels.. Also consider splitting the bank to 12v blocks, or if you can 6v blocks as you can compare which cells takemore/less time to charge. It seems like an expensive punt on copper to see if that makes a difference.

Already have spare welding cable and loads of spare batt links so not an expensive option...just time consuming ! Smile

.p.
Mostly harmless.... except if catering is shut.

Solar & Wind Sound System Shennanigans..http://diyhifi.biz/
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valve head777 View Drop Down
Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 12 December 2016 at 2:08pm
Cool man, let us know the outcome
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Greg32 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Greg32 Quote  Post ReplyReply Direct Link To This Post Posted: 13 December 2016 at 11:41am
Hi Phil, i would consider some low esr capacitors (the type used in smps etc) to help with the way your inverter draws power, if you have long leads to the inverter this may make the problem worse. if your inverter uses pwm in the sine wave converter it could run at 25khz or more for effieciency, that means your inverter will be drawing power at the same frequency and that gets problematic with long cables(high impeadence/inductance) regardless of their dc ability. just a thought Greg.
would love to see your rig it sounds well thought out.

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Phil B View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil B Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2017 at 11:26am
Well I did all the changes that I could...doubled up all the battery links, put in a 500amp isolator ( with the thick welding cable and proper 70mm lugs). And we set up for New Years Day gig.....

Well all I can say is that we now know the limit of the inverter and the system ! With our new Keystone subs ( B&C 18SW115 loaded) it would trip the inverter on about 3/4 volume. Seems the demand from the class D amps is very exponential. Chugging along at half volume we draw 7-11 amps @ 240 but turn it up very slightly and we saw peaks of 15-22amps which then overloads the inverter!

So in the end I don't know if we solved the ripple problem but now have an overall power problem We could run a second inverter for the keystone subs but we would be trying to pull 150-220 amps out of the bank continuously. Max input from the panels is 40-45 amps with direct full sun so we would be playing catch up all the time.

I think we will have to compromise with either SS15's or Keystones subs for stand alone events and ask for extra power if the whole system is needed. I have an idea about a hydrogen powered small genny ..but that's another whole can of worms !

.p.
Mostly harmless.... except if catering is shut.

Solar & Wind Sound System Shennanigans..http://diyhifi.biz/
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Mark James View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark James Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2017 at 11:41am
weve also been looking into hydrogene fueling a genny [well atm just getting "A" engine to try run on it as an experiment before modifying a useful genny]
let us know how you get on as i would be very interested in this.
If you want people to feel the bass then a reflex design is probably best as you get the most air movement per decibel from those.      errrrr yes wtf?
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Phil B View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil B Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2017 at 11:50am
Originally posted by Mark James Mark James wrote:

weve also been looking into hydrogene fueling a genny [well atm just getting "A" engine to try run on it as an experiment before modifying a useful genny]
let us know how you get on as i would be very interested in this.

There's a mob here in Melb who are doing it on a regular basis, I'm gonna go pick their brains when I get a chance !

.p.
Mostly harmless.... except if catering is shut.

Solar & Wind Sound System Shennanigans..http://diyhifi.biz/
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minaximal View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote minaximal Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2017 at 12:59pm
Solar panels are (relatively) cheap and don't explode or make lots of noise.. AFAIU Hydrogen extraction is still not very efficient or 'Eco'

More panels, bigger inverter, bigger Li Battery bank = More bass fun .. maybe less $$ though..

Hope NYE was fun though, got any pics?
Subs + Barges = :)

www.metaacoustics.com

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valve head777 View Drop Down
Young Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 09 January 2017 at 5:01pm
Perhaps one vision of the future is using pv to extract hydrogen from water. Using an infernal combustion engine seems perverse tho. New polymer technology should make fuel cell technology progress...
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