Why Go Solar Inverter System- Hiworks
This is a rough idea for battery and panel size for a Solar, Inverter and Batteries need.
If your last payment on public power is 15,000.00 for the month, and they charge you N22.50 per KWH. It means you have used 666.67KWH for the month in view.
You may compare few months and take an average.
Let us say your average for 6months is 800KWH, We could guess that with a culture of usage, you are doing 26.7KWH Per Day.
Without Iron, Pump, water heater, AC, this could mean you are on the 2kva Genset category OVERNIGHT. To run that 26.7KWH, it will take you 12hours at 1litre of petro an hour. Cost being for 12litres of Petrol being about N2000 per day and about N62,000 monthly or over N800,000.00 yearly with maintenance cost against public power at about N240,000.00 yearly and N1,200,000 on batteries for 2years.
This KWH Value is a very important information for deciding the make up of your Backup system.
Apparently, it is believed that basic home need on solar inverter system is 30KWH.
This will give you 15points of lights, 4points of fans, 2points of TV, 1point of Refrigerator, 4points of laptop, allows you ironing and water heating for 30mins each per day and pumping water for 1hr per day but the last 3 in the daytime only and around mid day.
The system being proposed here is hybrid, with Solar being the energy being used to support, ironing, water heating and pump.
When you buy the right panels, they will serve for over 20years efficiently and they are becoming more inexpensive.
40nos of 300W panels can be acquired for around N4M and that will deliver over 10KW at peak.
That could mean free energy for refrigeration,AC, ironing, laundry, water management, water heating for storage, and cooking. All these can be happening while the batteries are backing up for Essential night loads.
Once your freezer and fridge have enough solar energy daily at daytime, they can be on public power over night till the following day.
That way Batteries are devoted to Lights, TV, laptops, and fans overnight. That will keep a four batteries arrangement at the best condition of use and depth of discharge at 70%.
4nos 200Ah batteries cost an average of N6รบ00,000.00
There are other cost apart from those mentioned.
With all the cost factored in in these model, Budget shall be between N4.5M-N5M.
However, the content can be scaled down to N1M or less. Which ever plan is used, the cost benefits will be better than running a petrol or diesel gen for the same no of hours.
The only cheaper option now is public power and mainly because of the economics of scale.
We also carried our an audit for a client recently, who was trying to see if he could consider This solution.
The prospect stays in an estate that provides 24hours power supply. Public Power and 500KVA Genset being central to all the dwellers.
The client was on 90KWH per day, 3 times bigger than what was analyzed earlier. The estate having factored in other cost will obviously run a higher KWH than public offer at N22.5 per KWH.
Let's assume the Estate KWH is N50. It implies my client pays around N139,500 monthly.
A mansion of such load would have been on 15kva gen backup.This gen will consume at half capacity 3 litres of diesel every hour. At 12 hours daily for a year that is N2.6M. That will acquire 40panels that will be almost maintenance free for 20years.
However, note that the client enjoys Air-Conditioning overnight on the Estate plan. But on inverter and battery backup every 1hp AC for 12hours will require a minimum of 4nos 200AH Batteries and for efficient condition 8nos batteries. Almost a million naira to run 1no Ac for 2years. That is N600,000 on batteries for every AC Per year. For a mansion, that could be 2million dedicated to support only ACS.
This client will have to spend 6million on batteries every 2years to enjoy the same benefit the estate provides for Less than 1.8M yearly.
The economics of scale of centralizing the public power and genset made this estate energy cost highly efficient. Battery backup is not advisable for this client.
However, for an Estate or Individuals, where load does not favour battery backup, a Grid-Tie Solar Inverter will be recommendable, which are battery-less. Grid-Tie will cut down on energy cost for the period Solar Harvest is available, which is about 6 hours daily.
[2/22/2019, 14:24] Odusina Adewale Hiworks:
