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1350010 Post Posted: Mon Dec 31, 2012 7:29 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

bigcats30 Subscriber 15/09/2014 


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Pat-H wrote:
bigcats30 wrote:
Pat-H wrote:
I see that the price per W works out aroudn the same for panels from 80 - 125W
So is it better to go with one single 125W panel or 2 80W panels?
Obviously the 2 X 80W gives a totla of 160W as opposed to the 125W
But are there any advantgaes to one big panel over 2 smaller panels?

Also whats the best controller for a 125W or greater output?
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Thanks


I'd go with the two 80w ones.....least if one breaks you have a back up (which is probably highly unlikely)

If you feel you will fit more panels later on then its worth going for a bigger controller but that one will probably be just fine (it looks like the one I have)


I'll have to look at the roof and cable runs carefully as I think that will be the determining factor all else being equal.
If I go with 2 panels I'll need to run the cable from one panel to the other on the outside. which isn't ideal I presume if I have to a section of conduit is best to stop the cables flapping around?


It all depends on the length of the cables to where they join together and where you place them etc but yes you can just use conduit (techno1000 did for his).

I think you'll find that once you have done it you'll wonder why you thought it could have been difficult because it really is that easy....if anything cable routing inside will be the hardest part.......(Phil and I took over an hour just to find a route)

It actually took less to fit the panel and connect it to the controller.......routing is the pain.
 
1350012 Post Posted: Mon Dec 31, 2012 7:33 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

listerdiesel Subscriber 03/08/2015 


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We have 2 X 80W now, with a 20A controller. We will probably go for another pair, and while we 'could' be tight and use the 20A controller we already have, I'd go for another, separate controller as I mentioned erlier as it gives redundancy in the event of a single critical item failure.

I'd also go 2 X 80W as Bigcats30 suggests, the 80W panels are the ones leading the price drop at present.

Peter

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1350023 Post Posted: Mon Dec 31, 2012 7:41 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

747 Subscriber 30/11/2014 


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Just to say that I had a search for 12 volt wind turbines this afternoon and they have come down by 15 - 20% since the Summer.

A 300 watt turbine (Chinese made) varies from £126 to £155 depending on model.

I need 10 metres of 4 mm twin core cable if anyone knows where I can get it (for my small wind turbine). The ebay supplier who stocked it seems to have stopped the ad.
 
1350024 Post Posted: Mon Dec 31, 2012 7:43 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

listerdiesel Subscriber 03/08/2015 


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I'll have a look tomorrow, we keep 4mm three and 4-core, might have some 6mm two-core.

We only use TRS or H07 in new money.

Peter

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1350025 Post Posted: Mon Dec 31, 2012 7:45 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

Grath Subscriber 12/06/2015 


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I might be tempted to get another 80w to 100w panel for free standing.
I can use this if and when our roof panel is sheltered by tree's.
Even better, it can be aimed at the sun, instead of been flat.
Food for thought Smile

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1350050 Post Posted: Mon Dec 31, 2012 8:22 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

747 Subscriber 30/11/2014 


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listerdiesel wrote:
I'll have a look tomorrow, we keep 4mm three and 4-core, might have some 6mm two-core.

We only use TRS or H07 in new money.

Peter


Thanks Peter but 6 mm is over the top. Particularly as I have to join it to the 1.5 mm wire from the turbine, run it down the mast and into the van.

At present I have the regulator just inside a locker door but hope to fit a socket into the side wall of the van.

I have been using 2.5 mm 3 core wire (without using the Earth core). 4 mm low voltage cable will help a little with voltage drop over the 10 metre run.
 
1350051 Post Posted: Mon Dec 31, 2012 8:23 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

listerdiesel Subscriber 03/08/2015 


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Let's see what is there, we have stuff we don't know we have got! Very Happy

Peter

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1350085 Post Posted: Mon Dec 31, 2012 10:41 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

Pat-H Subscriber 04/04/2015 


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bigcats30 wrote:
Pat-H wrote:
bigcats30 wrote:
Pat-H wrote:
I see that the price per W works out aroudn the same for panels from 80 - 125W
So is it better to go with one single 125W panel or 2 80W panels?
Obviously the 2 X 80W gives a totla of 160W as opposed to the 125W
But are there any advantgaes to one big panel over 2 smaller panels?

Also whats the best controller for a 125W or greater output?
Only registered users can see links on our Forum
Join Now or Login



Thanks


I'd go with the two 80w ones.....least if one breaks you have a back up (which is probably highly unlikely)

If you feel you will fit more panels later on then its worth going for a bigger controller but that one will probably be just fine (it looks like the one I have)


I'll have to look at the roof and cable runs carefully as I think that will be the determining factor all else being equal.
If I go with 2 panels I'll need to run the cable from one panel to the other on the outside. which isn't ideal I presume if I have to a section of conduit is best to stop the cables flapping around?


It all depends on the length of the cables to where they join together and where you place them etc but yes you can just use conduit (techno1000 did for his).

I think you'll find that once you have done it you'll wonder why you thought it could have been difficult because it really is that easy....if anything cable routing inside will be the hardest part.......(Phil and I took over an hour just to find a route)

It actually took less to fit the panel and connect it to the controller.......routing is the pain.


I have my route planned so that's ok.
My battery feeds back to a central control box just behind the drivers seat. So that has the vehicle battery and leisure battery feeds connected to it (so you can select leisure or vehicle battery usage for habitation) so I can connect the dual controller into that and feed the liesure and habitation batteries for charging.
I already have a route from there to the locker above and thats right below the roof. So my panel cable will coem in above the locker and I'll run down to the main control panel an mount the dual controller there. If I go with the dual controller with the remote panel that remote can be mounted under the locker on the bulkhead.

I think I can fit on 80W panel right above the locker next to the rooflight but a second panel would have to go the otehr side of the rooflight and cross in front of it so conduit there seems the best bet.

So my shopping list so far looks like:

2 X 80 W panels
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20A dual controller and remote
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Roof entry gland box
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2 X panel mounts (may look at cheaper options but these look nice)
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Sikaflex
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4mm cable
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Y splitters
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Around £300 unless I've missed something.
 
1350097 Post Posted: Mon Dec 31, 2012 11:40 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

listerdiesel Subscriber 03/08/2015 


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I'd not buy a PWM controller, however good and attractive it may look.

I went through four different types of regulator to try and find out which was the most effective, and PWM types are not that good.

If you need more information, look up the various types of solar regulators, PWM, MPPT and Linear.

Of the three main types, the MPPT is the best and most recommended.

PWM is Pulse-Width Modulation, which refers to the way the controller regulates.

MPPT is Maximum Power Point Tracking, which means that the controller allows the solar panel to run at its optimum output voltage, while keeping the battery charged at a lower voltage.

Linear is not worth consideration, but I built one to try it out.

Don't take my word for it, do some research yourself and see what you can find out. MPPT is the recognised method of controlling panel output and that's the way that I and many others have gone.

They are not cheap, but I finished up with one like this:
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I have had good responses from their guy in Taiwan, who has answered all my questions without any ducking or diving.

Peter

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1350295 Post Posted: Tue Jan 01, 2013 12:28 pm Thank this member for this postReply with quote Add User to Ignore List Back To Top

Pat-H Subscriber 04/04/2015 


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I had looked at those but wasn't able to find a dual output model.
The plan was to feed the habitation battery and the vehicle as a split charge.

But I'll do some digging.
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