For roof top solar? Can you give an example of some numbers? Around here in NorCal, would cost ~20k for a system, and would save maybe $2400 a year, so would be more like 8.3 years.
I put solar on a friend’s roof in Sydney Australia (their landlord’s specifically, due to a lease to purchase agreement) for under $1/watt.
In short: bureaucracy. Depends on state but electrical things and stuff attached to houses usually requires greasing the local municipality with permits, submitting a plan, and hiring licensed electricians that cost way more than a general contractor. It may even require presenting it for approval to a HOA or town committee (god forbid the house might be historic, then it's another committee)
EDIT: My parents looked into it in NJ awhile back but their land is farm preserved and it's super restrictive on how much they can cover with a 'solar farm'. Also, it requires studies that prove it won't cast shadows or reflect onto neighboring properties. The township is extremely restrictive on what can be built anywhere (for example the center parts of it are mostly a deadzone for cellphones since the towers must only be installed on the border of the township).
The level of bureaucracy in Australia would make most Americans think it a dystopia.
The rest is just a mix of bureaucracy, regulations, building codes, energy companies frustrating the whole process, etc.
An additional factor is latitude. In Australia places like Sydney and Brisbane, are a lot closer to the equator than most of the US. San Diego is about comparable (well slightly closer) with Melbourne in how close it is to the equator. So, they'd be getting a bit more out of their panels even in the middle of their winter.
I'm in Germany, most of the country is about ten degrees further north than most of the US. People put solar on their roofs here because it works and there are some incentives. So, it's not that big of a factor. But if you add it all up, the US should be getting its solar a lot cheaper than it currently is.
Yes.
> Can you give an example of some numbers?
Yes.
I have a total of 23 solar panels with a maximum output of just over 1 MWh/month. The system cost around 34,000 BRL which is around 6,850 USD at current rates. Its expected lifetime is 25 years and it broke even in about three and half years. Current energy prices in USD/kWh varies between 0.15 and 0.17. The panels have been operating for about five years now and capacity has been expanded once already. They have generated a total of around 45 MWh. In 2023 output maxed out in November at 1.072 MWh and bottomed out in June at 396 kWh. The highest output ever recorded was 1.136 MWh in January 2021.
I have no batteries. In Brazil there's no way to go 100% off the grid so I decided against the added maintenance complexity of batteries. Energy is injected directly into the grid in exchange for "kWh credits" which expire in one year if unused. I suppose their aim was to incentivize people to produce as much energy as they consume since it makes no financial sense accumulate surplus credits by producing more. I've considered expanding production capacity anyway and just converting the excess energy into cryptocurrency. They refuse to pay me so I'll just sink any surplus into miners instead of giving it to them for free. Haven't gotten around to actually doing it though.
Panels do 400-500Wp these days. Times 23 gives a max of 11500W peak. You are off somewhere, or tell me right now where you got those panels.
1000000W/mo / 30 day/mo / 24 hr/day = 1388
Is it possible my idea of "panel" is different from everyone else's? I'm counting the individual units which I purchased and which were installed on my rooftop. I suppose it's possible these units are made up of multiple actual panels, each with the aforementioned 400-500 W capacity. Not sure.
Which might have a longer ROI.
Whether or not it’s a good thing is up for debate but it’s certainly harming battery ROI.