For off grid residential (which will be ~1 billion people), I wonder if it can be a lot cheaper to go all DC, avoid inverters, losses converting DC<->AC<->DC.
The cost of solar is 1X - 20X depending on location. US has the highest costs, followed by maybe Western Europe.
The panels are dirt-cheap[1] straight from China, but your friendly govt adds tariffs.
The balance of the system is super costly in some locations, ridiculously cheap in other locations.
In Pakistan, they are laying out the panels on the roof without any structure.
In most of the third world, homes are concrete built, they already have structural elements and it isn't a big deal to add panels. It is a massive project in US, because of shingled roof. Labor is also available, available immediately, and permitting is either easy or not necessary.
I'd assume the cheapest total install cost would be (cheapest to costliest): China, Pakistan, Bangladesh, middle-east,, Africa, South East Asia, Central America, Mexico, India, South America, Australia, Eastern Europe, Western Europe, Canada, and finally US.
I'm ignoring the cost of land which varies a lot in each country. We also don't need land, just add vertical solar on every structure, fence and wall.
[1]or as cheap as plywood which a HN comment pointed out
Assuming ~50M households in Nigeria, and the current cost of ~$4500 to equip a home with solar, the math is still daunting.
- The equipment needed to keep a three-person home running will pay for itself in as little as 16 months, BloombergNEF research shows — but, at $4,500, getting set up costs about seven times as much as buying a new petrol generator. (It’s the generator’s fueling costs that will eventually bite, at roughly $200 a month.)
(if you're looking for a startup idea for YC, consider a way to finance these systems for consumers; go to the bond market for capital, manage credit risk and accepting payments; your TAM is all of Africa's energy needs)
Solar panels also last at least 25 years, batteries anywhere between 10-20 depending on chemistry and cycling. Stocks vs flows.
(tangentially, China's solar PV manufacturing capacity is double current global demand, so capacity to produce is not the issue, but getting the clean tech into the hands of those who need it)
Yes, 92% production warranty at the end 25 years. Which is the longest product warranty of anything sold. At 92%, they could last a few more decades.
Newer panels are offering 40 year warranty.
40-year warranty covers the panel and its performance. And in the unlikely case you’ll ever need it, we make the return process simple and easy. With a historical return rate of only 1 in 20,000 panels under warranty: https://www.maxeon.com/maxeon-solar-panels
Great application of cross continental research by Blomberg. A typical Nigerian family of 3 (already atypical) is probably not spending one parents entire salary on electricity.
I am very happy to see Nigeria establishing such a sensible tradition.
solar and batteries will outlast a generator, and have significantly higher uptime, also quality of life around a generator is reduced, along withtime to start/stop and get the fuel, which requires fuel to get, so any reasonable comparrison would need to get hard numbers on all of the costs.
I live off grid, and can proffer this, that solar is slightly more boreing than watching paint dry, as the paint does change it's coulor ever so slightly.
Sodium batteries are going into giga scale production now and will offer significantly better economics ,for small business and farms solar is the thing that will smooth out economic shocks and give the versatility to adapt
thelastgallon 4 hours ago
Looks like it is possible: https://solarpoweredge.com/2026/05/10/pure-dc-off-grid-solar...
turtlebits 12 hours ago
I dont know what the $4500 includes, but you can fairly easily get 1kw of solar and 5kWh battery and inverter for 1k USD.
thelastgallon 4 hours ago
The panels are dirt-cheap[1] straight from China, but your friendly govt adds tariffs.
The balance of the system is super costly in some locations, ridiculously cheap in other locations.
In Pakistan, they are laying out the panels on the roof without any structure.
In most of the third world, homes are concrete built, they already have structural elements and it isn't a big deal to add panels. It is a massive project in US, because of shingled roof. Labor is also available, available immediately, and permitting is either easy or not necessary.
I'd assume the cheapest total install cost would be (cheapest to costliest): China, Pakistan, Bangladesh, middle-east,, Africa, South East Asia, Central America, Mexico, India, South America, Australia, Eastern Europe, Western Europe, Canada, and finally US.
I'm ignoring the cost of land which varies a lot in each country. We also don't need land, just add vertical solar on every structure, fence and wall.
[1]or as cheap as plywood which a HN comment pointed out
toomuchtodo 14 hours ago
Assuming ~50M households in Nigeria, and the current cost of ~$4500 to equip a home with solar, the math is still daunting.
- The equipment needed to keep a three-person home running will pay for itself in as little as 16 months, BloombergNEF research shows — but, at $4,500, getting set up costs about seven times as much as buying a new petrol generator. (It’s the generator’s fueling costs that will eventually bite, at roughly $200 a month.)
Related:
Chinese EVs Make Inroads in Nigeria as Gasoline Prices Rise - https://www.bloomberg.com/news/features/2025-02-26/lagos-ev-... | https://archive.today/lMAtD - February 25th, 2025
(if you're looking for a startup idea for YC, consider a way to finance these systems for consumers; go to the bond market for capital, manage credit risk and accepting payments; your TAM is all of Africa's energy needs)
ejanus 2 hours ago
silverFork 12 hours ago
toomuchtodo 12 hours ago
(tangentially, China's solar PV manufacturing capacity is double current global demand, so capacity to produce is not the issue, but getting the clean tech into the hands of those who need it)
thelastgallon 7 hours ago
Newer panels are offering 40 year warranty.
40-year warranty covers the panel and its performance. And in the unlikely case you’ll ever need it, we make the return process simple and easy. With a historical return rate of only 1 in 20,000 panels under warranty: https://www.maxeon.com/maxeon-solar-panels
telebub 12 hours ago
metalman 12 hours ago