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Another large PV system in Ghana

 
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adam2
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Joined: 02 Jul 2007
Posts: 7362
Location: North Somerset

PostPosted: Tue Jul 16, 2019 3:28 pm    Post subject: Another large PV system in Ghana Reply with quote

Details from my former neighbours in London.

For a large home and adjacent general store.

5Kw of PV on house roof, modules in series strings of five to give about 150 volts.
MPPT charge controllers charge the battery which is 24 volt nominal at over 2,000AH.
Maximum charge current is about 150 amps at just under 30 volts in optimum conditions.
In practice there is always some load and the net charging current seldom exceeds 100 amps.

The main loads are air conditioning, refrigeration, ice maker, deep well pump, and lighting.
Initially the system has not met with expectations due to the load being greater than anticipated.
Electric cooking was planned but its back to LPG for now, despite the great cost and intermittent availability thereof.

50% more PV is planned which should allow limited electric cooking.

Drinking water from the deep well is sold at ten cents per container (bring your own container, flat rate of ten cents for any container that one person can carry)

The total cost of the installation, but excluding appliances, was about $10,000. A government grant paid about 15% of this cost.
Another 2KW of PV will cost about $2,000.

Labour was very cheap, but not easily quantified as workers on a fixed weekly wage did other work also. Including building a large house.
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kenneal - lagger
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Joined: 20 Sep 2006
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Location: Newbury, Berkshire

PostPosted: Tue Jul 16, 2019 6:30 pm    Post subject: Reply with quote

You don't say anything about the inverter size as this will limit the usage. With our 3kW inverter we could run those loads but not all at the same time. The aircon and the deep well pump would be two things that we wouldn't run at the same time as both probably take a high starting current. If the refrigeration is of a domestic size that wouldn't cause a problem but if commercial stuff it would be something that wouldn't happily coexist with the aircon and pump.

I would be happy to run domestic lighting, if LED or even CFL, with domestic refrigeration, a computer, TV and a small appliance or two with one of the bigger loads at a time.
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adam2
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Joined: 02 Jul 2007
Posts: 7362
Location: North Somerset

PostPosted: Tue Jul 16, 2019 7:31 pm    Post subject: Reply with quote

The inverter is 5Kw and is ample for two air conditioners, two large domestic fridges, and the ice maker.

The deep well pump has its own dedicated inverter and controller, this produces a variable frequency and voltage in order to maximise efficiency.

Lighting is mainly 24 volt fluorescent, average load about 200 watts. Yellow lamps are fitted in some fittings to avoid attracting insects.

The public area in front of the shop has a roofed shelter to give shade from the sun, but is open at the sides on account of the heat.
This area is lit with a couple of low pressure sodium lamps, very old tech, but preferred as they do not attract insects.
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adam2
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Posts: 7362
Location: North Somerset

PostPosted: Fri Sep 20, 2019 4:20 pm    Post subject: Reply with quote

The extra PV capacity has now been installed and the installation is giving satisfaction.
Yellow fluorescent lamps have been very welcome as they do not attract insects. Yellow LEDs less satisfactory as some types emit just enough blue to attract pests.

The electricity supply now permits of electric cooking by induction rings, slow cooker, and microwave oven.

The general store has been a considerable success, especially the availability of cold beer and soft drinks.


A party of American tourists visited the area and complained that it looked "too modern" and that there "were no elephants" No elephants were promised! These animals do exist nearby in large numbers but are timid and seldom sighted.
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