Re: Finally, 35 years later, HDB puts solar panels on roof, PAP is so innovative....n
Thats exactly the reason why you need more panels. Despite having sunshine ranging from 4 to 9 hrs day, the clouds and the orientation of the roof in a gable structure are a factor. In Singapore, the dealers are pushing 8 panels for Singapore private properties because of the limited roof space while in OZ it is usually 20 panels as the majority of the roofs have space. You need 20 panels to get make a dent in your bills if the not the payback is minimum 10 years.
I contemplated before and the cost for 8 panel 3.5 kwp complete system with inverters and installation was about $12 to 14K. Similar system in OZ also complete installation is about $4K plus 20 panels 5kwp.
Rogue trader is right the pay back is not worth it and the system becomes redundant quickly. I know a doctor who installed his for $90K and his has battery storage but even then I did the math and the pay back is well over 30 years but I think he was more into carbon footprint etc.
HDB however is doing the right thing but the press and them have not been clear in terms of expectation. There is no roof space to power even 1% of the residents' and TC needs per block. It will only aid in helping reduce the cost of running the blocks water pump, the corridors lights etc. I don't think lifts can be helped.
Thats exactly the reason why you need more panels. Despite having sunshine ranging from 4 to 9 hrs day, the clouds and the orientation of the roof in a gable structure are a factor. In Singapore, the dealers are pushing 8 panels for Singapore private properties because of the limited roof space while in OZ it is usually 20 panels as the majority of the roofs have space. You need 20 panels to get make a dent in your bills if the not the payback is minimum 10 years.
I contemplated before and the cost for 8 panel 3.5 kwp complete system with inverters and installation was about $12 to 14K. Similar system in OZ also complete installation is about $4K plus 20 panels 5kwp.
Rogue trader is right the pay back is not worth it and the system becomes redundant quickly. I know a doctor who installed his for $90K and his has battery storage but even then I did the math and the pay back is well over 30 years but I think he was more into carbon footprint etc.
HDB however is doing the right thing but the press and them have not been clear in terms of expectation. There is no roof space to power even 1% of the residents' and TC needs per block. It will only aid in helping reduce the cost of running the blocks water pump, the corridors lights etc. I don't think lifts can be helped.
how about cloud covers?