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A large 12 volt solar electric installation

 
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adam2
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Joined: 02 Jul 2007
Posts: 6821
Location: North Somerset

PostPosted: Sat Nov 24, 2007 6:41 pm    Post subject: A large 12 volt solar electric installation Reply with quote

I have just completed the testing and commisioning of a large (by 12 volt standards) stand alone pv installation for a friend.
They have a grid supply and at present at least, no concerns re paying for fuel, the reason for the installation was that that they are expecting a great crash or disaster soon.

DETAILS

The pv array consists of 8 modules each 60 watt, these are grouped in two sub arrays each with its own charge controller, thus protecting against controller failure, though a spare controller is held in stock.

The battery consists of two strings each of 6 cells. Each battery has a nominal capacity of 2,100 A/H
Each battery is protected by a 200 amp fuse

Two grid powered battery chargers are installed, each rated at 80 amps, and each protected by a 100 amp fuse. One charger is mains powered, the other from a generator. Two spare battery chargers are stocked.

The house was re-wired throughout for both 12 volts, and 230 volts, the essiential 230 volt circuits being generator backed up.

12 volt lighting and 12 volt socket outlets were installed throughout, all fixed lighting is 12 volts, though 230 volt table lamps etc. can of course be used from the 230 volt sockets.

The 12 volt wiring consists of ten sub-circuits.
Lighting circuits are generally in 4.0mm cable on 16 amp fuses
12 volt power circuits are generally in 6.0mm cable on 20 amp fuses
The 12 volt fusebox has provision for two additional circuits

The 12 volt lights are mainly traditional pendants with 12 volt CFLs.
Portable reading or task lights with 12v 35 watt halogen lamps are available, fitted with 12 volt plugs.
The kitchen, workshop,loft, and utility rooms use 12 volt 1,200mm linear flourescent fittings. Ample spare bulbs, tubes and ballasts are stored.

No inverter was installed, 230 volt power being obtained from the generator.

The batteries are housed in the basement, and the generator in a brick outbuilding constructed for the purpose.

In total the cost was nearly 10,000.


Last edited by adam2 on Sun Jul 08, 2012 2:39 pm; edited 1 time in total
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emordnilap



Joined: 05 Sep 2007
Posts: 14296
Location: Houǝsʇlʎ' ᴉʇ,s ɹǝɐllʎ uoʇ ʍoɹʇɥ ʇɥǝ ǝɟɟoɹʇ' pou,ʇ ǝʌǝu qoʇɥǝɹ˙

PostPosted: Sat Nov 24, 2007 9:02 pm    Post subject: Reply with quote

Jealous.

Any pics?
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snow hope



Joined: 24 Nov 2005
Posts: 4104
Location: outside Belfast, N Ireland

PostPosted: Sat Nov 24, 2007 10:21 pm    Post subject: Re: A large 12 volt solar electric installation Reply with quote

adam2 wrote:
the reason for the installation was that that they are expecting a great crash or disaster soon.


Is this due to Peak Oil or something else Adam? Can you expand on this a little?
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adam2
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Joined: 02 Jul 2007
Posts: 6821
Location: North Somerset

PostPosted: Sun Nov 25, 2007 1:31 pm    Post subject: Re: A large 12 volt solar electric installation Reply with quote

snow hope wrote:
adam2 wrote:
the reason for the installation was that that they are expecting a great crash or disaster soon.


Is this due to Peak Oil or something else Adam? Can you expand on this a little?


PO was certainly a consideration, though they are also concerned by the risk of another war disrupting supplies of fuel and food.
They consider that Iran will either be invaded, to prevent them getting the Bomb, or that Iran will not be invaded, will as a result get the Bomb, and will then use this weapon against the West.
They consider that either outcome will lead to fuel shortages, food shortages and civil disorder.
They also feel that terrorists are likely to attack oil refineries, power stations and related infrastructure.
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adam2
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Joined: 02 Jul 2007
Posts: 6821
Location: North Somerset

PostPosted: Sun Nov 25, 2007 1:37 pm    Post subject: Reply with quote

emordnilap wrote:
Jealous.

Any pics?


Regret no, the owner of the installation is very anxious to protect theire privacy, and I promised not to take any.

I would be pleased to answer any technical enquiries regarding the instalation, but have promised not to divulge anything that could identify the owner, or even the district in which they live.
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adam2
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Joined: 02 Jul 2007
Posts: 6821
Location: North Somerset

PostPosted: Tue Dec 11, 2007 6:12 pm    Post subject: Reply with quote

UPDATE RE ABOVE

This system got its first real test during the recent bad weather, the grid supply failed for nearly 24 hours.

The generator was run for about 12 hours for heavy power needs, mainly electric heating and cooking.

P.S. let this be a cautionery tale regarding reliance on a coal/wood burning stove, the new costly Rayburn could not be used because the chimney had been blown down. It was recently inspected and appeared to be in order.

The owner is now about to install a second smaller wood stove in another room.
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