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24v Large Super Capacitors

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valve head777 View Drop Down
Old Croc
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Topic: 24v Large Super Capacitors
    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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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 = :)

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Phil B View Drop Down
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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 !

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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.
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Phil B View Drop Down
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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 !

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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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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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Phil B View Drop Down
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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

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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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Phil B Quote  Post ReplyReply Direct Link To This Post Posted: 11 December 2016 at 6:25am
Originally posted by carlosdelondres carlosdelondres wrote:

Maybe? Or drain one battery first until IR equalises, then one battery will try to charge the other depending on which drops more volts due to the peaks? Don't know, but it doesn't sound great for battery life...interested in the answer though!

Yep thanks you lot for all the suggestions. So I think our plan is

a) A deep discharge and then flat out charge. The Inverter / charger can do up to 10 amps 240v input so I reckon we'll disconnect the solar and let that do a full on charge.

b) double up batt link cables to reduce resistance around the bank. At the moment the inverter leads are about 1m & 1.5m for Neg and Posi sides. But it is super thick AWG 0 (55mm2) welding cable ! I could double up on that as well but would be tricky at inverter stud end for room.

c) Prob buy a cheapo truck batt 24v and put inline. This I'm prob gonna do anyway for the next gig as we will be running all 4 of our 15" SS15 subs plus 2 x new keystone subs with B&C SW115-4's !! So a lot more sub demand. I have a feeling that it can't hurt the bank and it'll either work or it won't, not that fussed about buying a s/hand single batt.

d) Try get an answer from the inverter manufacturers of how to disable the ripple alarm / cut-off. Maybe also re-flash the firmware to make sure it's not a glitch.

e) disable the equalise function in the Midnite controller.

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valve head777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2016 at 9:48pm
Remember the song, i know an old lady who swallowed a fly?
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valve head777 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote valve head777 Quote  Post ReplyReply Direct Link To This Post Posted: 10 December 2016 at 9:46pm
It really dosnt sound like a cable site issue . You would have figured that already via warm links etc.
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