D-day for people with rooftop solar in South Africa

isie said:
Panel wattage has increased for the same amount of real estate at lower the price you paid 5 years ago
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How much? 3%? His only solution is more batteries and more efficiency like a heat pump.
 
wingnut771 said:
How much? 3%? His only solution is more batteries and more efficiency like a heat pump.
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You can get for just Under 2k for 700W panels , 5 year old install I'm guessing it was under 500w panels ?
That's what 40% is it was 500w more if less wattage

I don't disagree even if increasing the PV he still needs batteries and more efficient appliances
 
isie said:
You can get for just Under 2k for 700W panels , 5 year old install I'm guessing it was under 500w panels ?
That's what 40% is it was 500w more if less wattage

I don't disagree even if increasing the PV he still needs batteries and more efficient appliances
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700W panels are not the same size as 500W ones. If the roof is full of 500W, replacing with new panels will only yield 3% more power, which is an expensive "upgrade".
 
Sapphiron said:
might be time to add a 4th 14.4 kWh battery to our office then.

currently we are wasting around 30% of our solar production because of how slow the COCT SSEG process is.
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What's the ROI on the special meter? Also, won't you still be wasting if you're only allowed to feed back 3kW max?
 
wingnut771 said:
What's the ROI on the special meter? Also, won't you still be wasting if you're only allowed to feed back 3kW max?
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We can do 3kw back to grid for about 6 hours every day for the 3 months in summer, and we use a lot of power in winter when our solar does not do much, so last time I calculated it, it was about 4 months. an extra battery return was about 14 months, but that was when the packs were R60k.
 
Sapphiron said:
We can do 3kw back to grid for about 6 hours every day for the 3 months in summer, and we use a lot of power in winter when our solar does not do much, so last time I calculated it, it was about 4 months. an extra battery return was about 14 months, but that was when the packs were R60k.
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1620kWh? How much they pay per kWh?
 
wingnut771 said:
AFAIK, 550W is the sweetspot for R per W.

View attachment 1941590View attachment 1941589
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Well that's if his current panels are 500w, we making a lot of assumptions, plus lots of options we can give but we assuming a lot, with little information, like no roof space he might mean no North roof space,🤷‍♂️

But the the thing we can both agree on no matter the issue lifestyle and energy efficiency can probably help the most.

Anwhoo So D day is here we not see what claims eskom tries to bully us with today
 
isie said:
Well that's if his current panels are 500w, we making a lot of assumptions, plus lots of options we can give but we assuming a lot, with little information, like no roof space he might mean no North roof space,🤷‍♂️

But the the thing we can both agree on no matter the issue lifestyle and energy efficiency can probably help the most.

Anwhoo So D day is here we not see what claims eskom tries to bully us with today
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All I'm saying is that if the roof is full with 5 year old panels (any wattage), replacing them with new ones (any wattage) will only yield 3% more power due to new panels being 3% more efficient than the old ones.

Also, not very good from a ROI POV. Panels should stay for 20 years.
 
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