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What to know before investing in a solar system — written for non-engineers.
From 26 June 2026 the cap on surplus rooftop solar sold to the grid rises from 20% to 50%, with room to agree more until the end of 2030.
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The first question almost everyone asks. Real prices per package, and how to read a quote properly.
Worth knowing before you ask for a quote: measure the roof and you already know what size fits.
This question usually gets a one-word answer. Here each concern is taken separately, and where the risk is real it is named.
The phrase appears in nearly every quote, and almost no quote explains it.
A question that comes up when comparing two quotes: one cheaper with lead-acid, one dearer with lithium.
There is no single best panel for every roof. But there are four numbers to compare, and comparing them settles the question.
The part of a quote most often skimmed, and the part most often argued over later. Two different things share the word warranty.
Wiring the wrong way really does cost output. But the choice is not a matter of preference — the inverter constrains it.
This question deserves an honest answer, even where the honest answer does not entirely favour the seller.
No solar system has a light that says panel seven is weak. But there are four levels of checking, from anyone to a qualified technician.
Some of it you can do, some you should not, and some you may not. This separates the three.
Both sit on the roof and both run on sunlight, so they get confused. They do entirely different jobs.
It can be done, but how easily depends entirely on the inverter chosen at the start — and on how old and new panels are wired.
Three kinds of cheap, with three very different risks. Where the saving is real, and where the sum goes wrong.
A small shadow costs more than the area it covers. Knowing why shapes how panels should be laid out from the start.
Self-consumed power appears nowhere on the bill — which is why it reads oddly. Three numbers to tell apart.
Excellent sunlight, aggressive corrosion. Here the problem is not output but service life — and bolts fail first.
The roof is yours; the sunlight is not. Three common situations next door — and rainwater causes more disputes than shade.
Wide roofs, daytime load, buildings that stay put. But summer holidays and funding make the sums different.
The common payment arrangements and the clauses worth reading — plus one simple comparison most people skip.
Both are free and clean, but not equal for a house. Sunlight is everywhere; usable wind is not.
The filter pump is a large, quiet daily load whose hours can be moved — which makes it an unusually good fit.
Most disputes after installation come not from the equipment but from lines that were never written down.
It sounds distant given a 25-year performance warranty. But it shapes what you should buy today.
Wide unshaded roofs, easy access, simple maintenance. But roof structure and rural grid quality need separate thought.
Understanding the principle will not make the system run better, but it makes quotes far easier to read.
A parking area and a roof are enough technically. The hard part is that charging hours rarely meet sunny hours.
The most important appointment, and the one owners attend most casually. Signing means you accept what was delivered.
There is no single answer, because it depends what you want the battery for. But there is a way to reach your own number.
Payback sums only cover the money up front. Here is what the two decades afterwards actually cost.
The real constraint is not area but the neighbour's shadow. How to reclaim roof space, and the spots people overlook.
Some things you can check in ten minutes; others you must never touch. This separates the two.
A few effects are real; several worries are not. This separates them, and points to what decides it: earthing.
The roof work is quicker than people expect; the delays sit either side of it. And why waiting out the rainy season is the wrong sum.
One of the few cases where solar fits almost perfectly: water is needed most when the sun is strongest. And a tank beats a battery.
Two cases usually dismissed as impossible. They are not — but the thinking about scale and ownership has to change.
It works — but only when charging hours meet sunny hours, which for most people they do not. Four ways to make them meet.
The panel is rarely what fails first. It is almost always the frame, the bolts, or the roof fixing.
A roof has three fixed limits. These four mounting types remove all three, at the cost of a heavier frame.
A quote full of abbreviations is hard to decide on. The terms you will actually meet, explained plainly.
Every abbreviation on a panel datasheet explained — and which ones actually affect what you pay.
Inverter specs are harder to read than panel specs. Which lines matter, and why MPPT count decides everything on a complex roof.
Selling surplus power needs one. Who installs it, who pays, the right order of steps, and how to read it.
Your existing supply has already decided. When three-phase is genuinely needed, and when upgrading is just spending.
Usually not. But four situations do require touching the existing system — worth knowing before you sign.
Two ways to buy. What a package really gives you, when buying separately makes sense, and the five items most often cut.
The errors that cost most — either in rework, or in output quietly lost for twenty years.
Two ways to keep the lights on, fundamentally different. Compared on criteria you can actually use.
Good equipment fitted badly still fails. Ten concrete questions you can ask by phone, and how to read the answers.
Daytime load matches daytime output, so self-consumption is high. Farms and aquaculture have a reason that matters more than the power bill.
The only kind that works where there is no grid, and the most expensive. Why it must be sized for the worst day.
Solar systems rarely fail outright; they drift down. How to read a day's curve and which numbers matter.
The gain depends entirely on what is underneath and how far away. On a flush-mounted house roof, almost nothing.
The first two items cut to lower a quote, and the two that should never be cut. What each does, and how they differ.
A shaded roof does run cooler, measurably. But it is a side benefit, not a substitute for insulation — and heat cuts output too.
Not someone else's numbers — your own bill, including the four things usually left out of the sum.
A warranty does not cover storms, lightning, fire or theft. The part few ask about when buying, and the hardest to sort out later.
Installed to run twenty years, but few people stay twenty years. Three options, and the clauses to read before you buy.
Opening hours match generating hours, so self-consumption is high. But business tariffs differ, so the sums must be redone.
The cheapest and easiest moment is while the house is still on paper. What to do at design stage, even if you will not install yet.
A standard grid-tied system shuts down when the grid fails, even in full sun. Why that happens, and what it takes to keep the lights on.
The three roof types differ in mounting, waterproofing, cost and risk. Includes the roof area each system size needs.
Around 2.3–2.6 kWh a day. Where that number comes from, what drags it down, and why the north and south of Vietnam differ.
The answer is completely different on-grid versus running off batteries. Two problems, two ways to size the system.
Panels degrade rather than fail. What wears out first, what shortens their life, and the three options after 25 years.
How much dirt costs you, how often to clean for each environment, how to do it safely, and when to call a technician.
It drops, sharply in the north. But every serious output figure is already a yearly average — so the wet season does not break the payback maths.
There is risk, but it sits in workmanship and cheap parts, not in the technology. Three real causes and seven things to check.
Weight is not the main concern — wind uplift is. What each roof type can carry, and the signs a roof needs reinforcing.
Most domestic wiring skills carry over. Here is exactly what to add: technical knowledge, paperwork, tools and a supply route.
Procedures depend on system size: under 100 kW, under 1,000 kW, and 1,000 kW and above. Which form goes where, and what happens if you skip it.
The threshold is not how many kWh you use but which tariff band you buy at. Vietnam's tiered pricing, marginal rates, and three worked examples.
Three reasons people buy storage, and why being able to sell 50% of surplus power since 26 June 2026 weakens one of them.
How to size a rooftop solar system from your roof area and your monthly electricity bill.
The difference comes down to one thing: whether the system stores power. That changes both cost and daily use.
The protection rating decides whether a device may sit outdoors or must stay inside.
Why home storage packs use LiFePO4 almost exclusively: safety, cycle life and heat tolerance.
What a company needs to prepare before ordering own-brand panels: volume, branding, certification and lead time.
Discount tiers, territory protection and how Asia Energy ships straight to your end customer.
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