Design Innovation

Going back to my post on "Innovation in Solar", there are a number of things that need to be exchanged with you, one for instance what is the Total Load as opposed to the Total Watt Hours (Whrs).  Solar deals in kWhrs or kilowatthours which comprises one unit of electricity.  Every time the meter in the house turns a unit it has consumed a kWhr.  Re-posting my original writing here as below :

10 CFLs = 10 * 20W = 200W * 8 hours                   = 1600 WHrs
1 Aircon =  1 * 5KW = 5000W * 2 hours                 = 10000 WHrs
2 Ceiling Fans = 2 * 50W = 100W * 8 hours             = 800 Whrs
1 Clothes Washer = 1 * 3600 W = 3600 W * 0.5hrs = 1800 Whrs
1 Computer/printer = 1 * 500W = 500 W * 2hrs       = 1000 Whrs
                                                                               ==================
                                                                                    15,200 Whrs

Now selling a unit that generates 15,200 Whrs or 15kWhr will require a design based on our basic methodologies, which incorporate Array Design, Battery Design and Inverter Design, which I write as is, based on a mail received from Bhagavandas Bhandary based out of Bangalore.  Bhagavandas works in Su-kaam and is an expert in the field of Inverters and their design.  "There is no foolproof methodology to calculating load, a lot of it instinct."

I details out my strategy as described by Bhagavandas to me in his mail, though not comprehensive but very thorough detailing has been provided by him including detailed specs for smaller systems, which I am sure you will find interesting :

I    SCP - Mini Home

-------------------

1. Design
-----------
A home consumes 81 w * 3 hrs = 243 whrs/day

PV
---
243/5.5 = 45 whr/day = ideal array size

45/0.72 = 62.5 W PV

Battery
-------
243 Whrs/day (Avg daily load) / 0.9 Inv Eff
= 270 Wh/day

270 Wh/day / 24 DC system volts = 11.25 Avg AH/day

(11.25 x 1.11 battery temp multiplier x 2 days

autonomy) /0.5 Battery DOD
=60 Total System AH

Charge Controller
-----------------
15 Amps

Inverter
--------
81 W total AC load = min inverter continuous watt

Inverter size 240 VAC 100W

2. Final Specs
-------------
PV 100W
LMLA battery 24 v, 60 AH
Charge Controller 15 Amps
Available Energy/day Whrs 250
Inverter Capacity 600 VA
Autonomy 2 days
Price : Rs 50,000 ex india

3. Load as given below
--------------------
15w x 2nos, 11w x 3nos, 9w x 2nos running for 3
hours per day

-----------------------

II   SCP - Small Homes

----------------

Final Specs
------------
PV 160 Wp
LMLA 24 V 100 AH
Charge Controller 15 Amps
Inverter 350 VA
Available Energy/day 450 Whrs
Autonomy 2 days
Price : Rs 75,000 ex india

Load
----
15W x 3 nos, 11W x 3nos, 9W x 2nos for 3 hrs/day
90W ceiling fan x 1no for 2 hrs/day
80 W 21' col tv x 1no for 1 hr/day

--------------------------------------

I have other systems available, which would be for larger homes, do let me know if they interest you. These would be the SCP - Medium Homes and SCP - Large Homes
Also for higher than 2 kW systems, I will have to design the systems according to your need.

Interesting read this one, as also the pricing, set my immediately buzzing, thanks Bhagavandas, and for anybody else he is available at bbhagavandas@ymail.com

I am compiling a list of emails to the contributees to this blog as also their contribution that I will share with you as the list goes bigger.  My immediate reaction on receiving this mail was :

1.  Is this data correct ?

2. Can anybody validate it ?

3. Is alright to trust a designer solely on his qualifications ?

4. Can I find better designers ?

5. If yes, where do I look for them ?

If you answers to the following questions, mail them to me at info@freshenergy.co
Looking forward to hearing from you.