@rizwan400
I am not very knowledgeable about Axpert inverter specifications. It's just an estimated cost, it can go much higher or lower depending upon individual components. I'm sure you can guide the poster better in this respect. If you remember, I did meet you a few weeks back in your office to discuss my solar set-up and I appreciate your guidance in this matter.
I have been doing a lifecycle cost analysis of components and I have come to the conclusion that solar is very feasible in daytime, but it is not at all feasible for night time running. At night time, you are better off using Wapda and keeping solar as backup during load shedding.
Lets assume we are using Sacred Sun batteries (SPG12830W) It can give 1200 cycles at 30% DOD, 500 cycles at 50% DOD. Each battery costs Rs. 36000. Let's assume we have a battery bank of 4 batteries wired in series with a 3KW inverter and we keep batteries at 30% DOD because that gives you maximum cycle life.
Total cost of 4 batteries Rs. 144,000
Total watts of battery storage (200AHx48V) 9600W
Usable energy at 30% DOD (30% of 9600W) 2880W
If battery is cycled to 30% DOD once every day
1200 cycles / 364 days = 3 years and 3 months
That means battery will give 80% or more of the rated capacity for 3 years and 3 months after that capacity will decrease by 20%. That means after 3 years of running, the usable watts will drop from 2880W to 2300W, and this degradation will continue year after year. till the batteries are no longer able to support the load.
Lets calculate the total KWs you are getting out of batteries
2.8KW per day x 3 years = 3057KW
2.3KW per day x 3 years = 2511KW
1.8KW per day x 3 years = 1965KW
1.4KW per day x 3 years = 1528KW
Total lifetime storage in KWs 9061KW
Divide this by the cost of batteries Rs. 144,000 / 9061W = Rs. 15.89 per KW
That means battery storage is costing you Rs. 15.89 per unit. assuming that they last 12 years, which is impossible. I hope I have done the calculations right. I would like to hear your opinion on this.
