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TH & Unity Horn 24v Solar sound system

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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: 21 July 2020 at 8:46am
Ok so the plan we have worked out...

1 x 2 ohm 200w resistor to live next to the Super Cap bank. That then is used in-line everytime the bank is connected up. We're gonna make sure the caps at least are up to 13v so the pull from the batts shouldn't be too much for the resistors.
We only disconnect the batts about once every year so shouldn't be a huge pain in the butt !
Mostly harmless.... except if catering is shut.

Solar Sound System Shennanigans..http://diyhifi.biz/
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bob4 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bob4 Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2020 at 9:34am
Enjoying this thread time and again...... Phil, do you have any comments on the keystones? Would be interested to have a little assessment from you! 
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odc04r View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 21 July 2020 at 10:04am
Originally posted by studio45 studio45 wrote:

Well, actually SLA (sealed lead acid/gel cell/AGM/maintenance-free) aren't any good at all for starter motor duty, which is actually 300A+ for a medium sized engine. Only flooded lead acid (the kind with liquid acid inside, that you can't tip over else it dribbles out) can cope with that kind of instantaneous current.

I suppose you could be brave, and just accept the massive spark that happens the first time you hook up the caps to the batteries; if you're then leaving them connected all the time, not a problem; it will be a doozy though!

or, use the bulb to limit current initially via some croc clip leads, then when charged bolt up the connection permanently.


Ah fair enough, I thought they were fairly cross compatible. Must admit not something I've ever looked into too deeply, datasheets are good
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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: 21 July 2020 at 10:09am
I love our Keystones !
For a single box with 4 ohm driver they make a lot of noise but I think the main thing is they complement the SS15 main subs. The SS15s drop off sharply at 40 hz and the keystones take over at that point. I haven't quite nailed the delay between the two as we seemed to always have no time on setup to do a time align ! But we are running them:

keystones 35 HPF L-R 24 , LPF 80 L - R 24
SS15      40 HPF BW 24 , LPF 100 L- R 24

That seems to me to give the nice blend of both whilst reaching up to the Unities.

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

Solar Sound System Shennanigans..http://diyhifi.biz/
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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: 19 October 2020 at 10:16am
So after being under proper lockdown ( no leaving house, 5km limit etc etc ) we finally have a bit more freedom and have been fitting the Super Caps. We ended up with the resistors setup in a box with two terminals...one going direct , one through the resistors. I found a heap of old passive crossovers at work which were going to be binned so we grabbed a heap of resistors from them. Charged up fine, nice and slow up to 14v.





Then fitted them in small wooden cases which live under the benches and they go in parallel to each 12v side of the trailer.







But we then ran a quick check to see what effect they would have.... seemed to be not a lot ?? Running flat out with solar off and the batteries at full charge still seemed to cause the inverter to ripple. So Rich investigated further .... One noticable thing whilst the batts were visible was the corrosion that had formed on some battery terminals, seems even a plastic sticker or even a small piece of gaff ( which you can see in the pic above) on the top of the batts could cause enough of a moisture path between poles to start the fur up ! Also some of the cable was doubled up across the multiple terminals but not all. So Rich cleaned everything, doubled up all the cabling and coated all the terminals in anti-corrosion paint...



Ran it all up again and a vast improvement. We had to go very hard on the amps to get a ripple alarm but at that point the voltage was really sagging. It's probably down to the chemistry of the batts themselves on how much they can actually give that quickly, being " deep cycle / standby " batts they are not really made for that usage with a low C rating compared to modern li-po / li-ion but we would never run at that level without sunshine anyway so a kind of win !!

So now we will have to wait for our first gig to really test out wether the caps have improved things sonically..... gonna be a long wait sadly...nothing till next March on the books so far...

.p.

Edited by Phil B - 23 October 2020 at 11:43pm
Mostly harmless.... except if catering is shut.

Solar Sound System Shennanigans..http://diyhifi.biz/
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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: 24 March 2021 at 10:18am
So a few gigs finally !! A couple of outdoor festivals ...







After a long time in lockdown where we managed to get a lot of system testing / fine tuning done ....and finally we got to run the system hard on the batteries / capacitors...it all seems a lot better.
One thing that cropped up in measurement is that the mids seem to HPF themselves ( due to the tap size). We were trying to add a HPF for the combined mids + tops which meant we always had issues around 300-350. Lowering the overall HPF and allowing the mids to do it themselves seems to have cured the problem.
There were no more ripple alarms when running purely on batt power ... sadly the weather on the first festival was " biblical" and we had to run backup power all day. But festival 2 was glorious and we only hit backup after sunset because we were running all the sound and backline !!

... Happy to be out in the wild again ... and Happy with the little tweaks ..

Roll on the next gigs


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

Solar Sound System Shennanigans..http://diyhifi.biz/
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