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I have a 2000VA 24V Modified sinewave inverter with 2 175AH batteries.
My daytime usage is upto 500 watts. (Upto 3 fans+ few lights and laptops). I would like to use solar in the day time to run these and use mainline to charge batteries. At night I would like to use wapda and batteries. at night usage is around 800 watts.
Can some please suggest:
1-How to set this up, equipment requires, cost
2- Suggest professional, shops where I can get these components and installation help in Rawalpindi
3- Does this setup make sense
ALHAMDOLILLAH m using this , not only in day time but 24 hours most of the time .
There is no need to charge the batteries IF u r planning to use wapda in night , the batteries should b charged SO SO to maintain some state of charge ( SOC ) .
it is advised that you Dont charge your batteries from WAPDA , but use the WAPDA directly , this will cost you less . And there is no sense of charging batteries IF you are using the WAPDA in night and solar in Day time . , for day time the solar panels will handle the charging and in night you will use WAPDA directly from the utility lines .
in your scenario u would like to use solar in day time load is 400 watts , for this you need to put minimum of 700 to 1000 watts of panels , i would suggest the POLY one , not the mono . rest the choice is yours .
always get the panels with warranty.
Second thing you need is the charge controller ,
ordinary PWM charge controller will work IF YOU ARE INSTALLING ATLEAST 900 WATTS OF PANELS ,
sophisticated high end Charge controller known as MPPT will work great even the panels are of 700 watts only . but there is a price difference between PWM and MPPT .
there are other methods too in which you can SAFELY eliminate the charge controller form your setup but for this you need to have some knowledge of these gadgets and electronix as well . So it is not advised in your case .
u said u r running inverter on 24 volts so it is also advised that you go for solar panels made for 24 volts system and not for 12 volts (12 volts panels will also work in series but you will loose some power and framing cost would another issue for you )
because i have both the setups on 2 locations , one at home and one at my farm / lands and i found the 24 volts system is more efficient and less power / line losses .
for your setup , u will need 30 to 40 amps PWM charge controller (with warranty) around Rs : ten thousand to 14 thousand .
wiring cost depends on the location but it is roughly will b somewhere between 1000 to 4000 Rs including connectors / wires / tie clips etc .
Framing for solar panel would cost you around 2500 per panel of 24 volts having 72 cells in it .
if u go for aluminium frame it will cost double .
this is one time investment and u can enjoy the FREE electricity for a long time in sha ALLAH .
IF your inverter is not a sine wave one so be careful in using on sensitive untis like PC / LEDs etc .
solar panels rates are different depends upon the brand / type and quality .
roughly china made POLY Crystalline panels are 70 rupees per watt .
56000 Rs for 800 watts panels
The total will b
56000 Panels + 14000 charge controller + 4000 wiring + 7500 framing (in case u r using 300 watts panel X 3) + 2000 extra for bla and bla
Total = 83500 Rs
Good Luck .
love to help if u need advice .
m based in karachi .