New Solar setup

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bachus
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Re: New Solar setup

Post by bachus »

This is what I found . . https://chsmith.com.au/Products/Viper-P ... r-Box.html
Small and using dyneema like I planned. Seems someone stole my idea lol . .
Jim
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Re: New Solar setup

Post by bachus »

But drum dimensions need to be looked at . . No dimensions in the link I provided.
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Re: New Solar setup

Post by zebedee »

Wanton wrote:
May 28th, '21, 18:16
...Could that be my problem with this solar panel and how badly it is functioning...
zebedee wrote:
May 28th, '21, 19:11
Your panel under-performs because it's rated open circuit current is only 15V.
I found the photo of the label on Ed's panel; it's worth posting since I've certainly never seen a panel with a Voc (15V) or Vmp (12V) so low before; it's obviously been intended for use without a regulator, a dubious practice even with smaller panels.

Eds 15v panel.png
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Re: New Solar setup

Post by rseydler »

That is odd. Has anyone stuck a multimeter on it?
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Re: New Solar setup

Post by zebedee »

Not yet; I haven't crossed paths with Ed lately.
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Re: New Solar setup

Post by Wanton »

Yes it is a very underperforming solar panel. I need to replace it ASAP. When I do I will need Zebedee or Jim to hold my hand as I open the wallet.
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Re: New Solar setup

Post by madmission »

Re under performing solar components , watch this for a laugh , has two follow up vids.
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Re: New Solar setup

Post by zebedee »

Another "defective" battery:
Big battery.jpg
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Re: New Solar setup

Post by madmission »

Quite an effort for a cheap scam zeb ? Or was the padding drugs ?
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Re: New Solar setup

Post by zebedee »

The padding appears to be concrete. Apparently in Vietnam (and doubtless many other places) empty battery cases are readily available.
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Re: New Solar setup

Post by Wanton »

Hi electical gurus,

I just spotted this solar panel for sale in Sunbury and I am very tempted. It says it is a 160 Watt solar panel and it had a photo of the specs on the back. What do you think? May this be the solution to my charging problems?
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Solar panel.png
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Re: New Solar setup

Post by Furstin »

Yes, looks to be a 12v panel bit house panel. Check regulator Max.voltage but its under your reg amp so should be good.
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Re: New Solar setup

Post by bachus »

Wanton wrote:
Jun 10th, '21, 22:13
Hi electical gurus,

I just spotted this solar panel for sale in Sunbury and I am very tempted. It says it is a 160 Watt solar panel and it had a photo of the specs on the back. What do you think? May this be the solution to my charging problems?
Get the dimensions of the solar panel part - the black bit. The power can then be computed ;-)
Jim
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Re: New Solar setup

Post by Wanton »

Here is a photo of my Solar Controller. Do you think its ok with that solar panel?
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Solar Controler.png
Ed
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Re: New Solar setup

Post by Wanton »

bachus wrote:
Jun 10th, '21, 22:32
Wanton wrote:
Jun 10th, '21, 22:13
Hi electical gurus,

I just spotted this solar panel for sale in Sunbury and I am very tempted. It says it is a 160 Watt solar panel and it had a photo of the specs on the back. What do you think? May this be the solution to my charging problems?
Get the dimensions of the solar panel part - the black bit. The power can then be computed ;-)
Ok I'll get it. Thanks
Ed
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Re: New Solar setup

Post by bachus »

For example a "200 W panel" that I did buy
Dimension 1000mm x 510mm claimed 200W

200/(1 x .510) = 392.1569 watt per sq meter

No way, best technology will be 170W per Sq meter

So re do the math

100/(1 x .510) = 196.0784 <-- WARNING might not even be a 100W panel
80/(1 x .510) = 156.8627 More like an 80W panel

So I bought knowing is likely to be approx 100W
Jim
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Re: New Solar setup

Post by Wanton »

Thanks for that Jim. As you know the issue with my current so called 100 watt solar panel is the max voltage that it pay out. Its only puts out a maximum of 15 volts (VOC) but rarely above 14 volts. So its just not really good enough.

The photo below is saying the VOC is 22.3 Volts. So I guess that would be a lot better than my current panel.
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Solar panel.png
Ed
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Re: New Solar setup

Post by bachus »

Wanton wrote:
Jun 10th, '21, 22:34
Here is a photo of my Solar Controller. Do you think its ok with that solar panel?
High current - good (future proof)
Lithium battery support - good (future proof)
Input voltage up to 50Volt - good ie you can run two panels in series should you wish to but as a pulse width modulation controller no advantage to be gained in doing so - this works better with MPTT controller
Jim
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Re: New Solar setup

Post by Wanton »

bachus wrote:
Jun 10th, '21, 22:56
Wanton wrote:
Jun 10th, '21, 22:34
Here is a photo of my Solar Controller. Do you think its ok with that solar panel?
High current - good (future proof)
Lithium battery support - good (future proof)
Input voltage up to 50Volt - good ie you can run two panels in series should you wish to but as a pulse width modulation controller no advantage to be gained in doing so - this works better with MPTT controller
So now i just need to see if I can make it fit on the boat. I am thinking it could be a bimini.
Ed
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Re: New Solar setup

Post by zebedee »

Anybody can get labels printed with whatever they want on them!
Solar panel.png
Solar panel.png (202.89 KiB) Viewed 46 times
Claimed electrical characteristics are as follows:
Open circuit voltage (Voc) is 22.3Volts and maximum power voltage (Vmp) is 18.2Volts
These figures are normal for a panel intended for use with a 12Volt system regardless of the panel output and are likely to be correct.

Claimed closed circuit current (Isc) is 9.75Amps and claimed maximum power current (Imp) is 8.79Amps.
8.79Amps x 18.2Volts = 160 Watts, so the claimed current is consistent with the claimed power output.

Claimed power is 160 Watts.
To get 160 Watts you'll typically need around 1.0 to 1.2 square metres of panel.

Claimed panel dimensions are 1.2m x 0.54m = 0.65 square metres. Someone is telling porkies.

For comparison:
  • Low Energy Developments, a reputable seller in Preston, has a 1.4m x 0.54m (0.75 square metres) panel rated 120 Watts, thus 160W per square metre.
  • My 9 year old 135W panel is 1.48m x 0.68m = 1.01 square metres and (via an MPPT regulator) delivers about 10 to 11 Amps into a 12V battery, thus 135 Watts per square metre. The highest I have ever measured from it was 11 Amps. (11.0Amps x 12.3Volts = 135Watts)
  • For $170, Jaycar, who can presumably be trusted, will sell you a 130W panel which is 1.179m x 0.664m = 0.783 square metres, thus 166 Watts per square metre.
So the true output of the panel you have found is almost certainly about 100 Watts.

Do you want more than 100Watts?
Do you have room for more than 1.2m x 0.54m?
Extra panel width is easy to accomodate, 1.5m long (across the boat) is probably about as wide as you want to go unless your stern is quite a bit wider than a Castle, otherwise the panel becomes a nuisance at high wharves such as the rotunda at Lakes Entrance when the boat rocks.

At 100Watts, you're looking at 1.2m x 0.535m and $129 pickup at Preston.

At around 1.5m x 0.7m you can buy a 170W panel for around $150 (ebay) to $209 (Jaycar).

If you've got room for 1.6m x 0.8m, I've been working with a bunch of (very) second hand 175W panels (checked when we bought them last year) this size on the tractor shed at the farm, and 200W panels are available in this size for $250 in Preston.

Don't buy a regulator before you've got a panel. Talk to me first, we've been buying MPPT regulators for the tractor shed recently.
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Re: New Solar setup

Post by zebedee »

Ahh I see you've already got a regulator. It appears to be a PWM reg, not MPPT, but it is suitable, and we can measure what it does once installed. If it isn't MPPT, we can always replace it.
As for mounting a large-ish panel, have a look how I did mine. There's really not much choice but to put it across the transom, especially if you have a backstay. If you can make the mounting permanent and support the mast on the trailer, then it won't add to rigging time.
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Re: New Solar setup

Post by Wanton »

Back to the drawing board. The Solar Panel was given to a relative. Luck
Ed
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