Short Summary
Three quotes for the same villa roof will rarely share a format, a brand list or a scope boundary. That is a presentation problem, not proof that two of them are dishonest.
Read every quote against the same 12 line items: system size in kWp, module make and model, inverter make and kW rating, mounting and corrosion spec, cabling and isolators, monitoring, DEWA scope, performance estimate, warranties, exclusions, payment schedule and O&M.
In Dubai, only DEWA-enrolled solar PV consultants and contractors can connect a system to the grid, and DEWA charges a one-off connection fee of AED 1,500 per renewable generator. Your installer files the application, coordinates inspection and metering — you sign and supply documents.
Watch for the seven quiet gaps: unnamed hardware, savings presented as a guarantee, no confirmation of DEWA enrolment, vague exclusions, discounts with a 48-hour deadline, warranties with no performance detail, and no maintenance scope.
UAE VAT is 5%. A quote should state clearly whether the headline figure includes it.
You cannot compare three solar quotes side by side because they were never written to be compared. One prices a 10.5 kWp system, another an 11.2 kWp, one names the modules, one says "Tier-1 panels", one includes two years of cleaning, one is silent on maintenance entirely.
The fix is not to become a solar engineer. It is to read each document against a fixed checklist, in the same order, every time, and to notice what is absent rather than being persuaded by what is present.
This guide gives you that checklist: 12 line items with what a strong quote says and what a weak one says, seven red flags with the calm question to ask instead, and a copy-paste list you can send back to an installer in two minutes.
None of this is a reason to hesitate. It is a reason to insist on documents you can actually read.
Why three quotes for one roof look nothing alike
There is no standard quotation template for rooftop solar in the UAE, and no regulator that adjudicates between competing proposals. We have written separately about the absence of a referee in solar quote comparison, and it is the root cause of most of the confusion.
What DEWA does regulate is who may connect a system and how. Only DEWA-enrolled Electrical and DRRG Solar PV consultants and contractors are authorised to install, operate and maintain a grid-connected PV system in Dubai; a system installed outside that scheme is not eligible for grid connection or for net metering (DEWA).
That single rule is your first filter. Everything else in the quote is commercial and technical judgement, which is exactly where formats diverge.
Two more structural facts worth holding in mind while you read. DEWA runs the connection in three stages — application, inspection and connection, then generation — and your contractor submits the application, notifies DEWA when field work is complete, and coordinates the site inspection, connection agreement and meter installation (DEWA). And the civil or structural part of the installation needs a building permit from the competent authority, such as Dubai Municipality or Trakhees, plus a completion certificate after final checks (DEWA).
You do not need to run any of that. A competent installer does it every week. You need to see it named in the quote, with a clear statement of who pays each fee.
The 12 line items every solar quote should contain
Print this table, or keep it open next to the PDFs. If a line item is missing from a quote, that is information — write "not stated" and ask.
# | Line item | Why it matters | What a strong quote says | What a weak quote says |
|---|---|---|---|---|
1 | System size in kWp | It is the only number that makes prices comparable | "24 × 590 W modules = 14.16 kWp DC" | "Approx. 14 kW system" |
2 | Module make, model, wattage, quantity | Determines yield, degradation and who honours the warranty | Named manufacturer, exact model code, unit wattage, count | "Tier-1 mono panels, 580–600 W" |
3 | Inverter make, model, AC kW rating | Sets clipping, monitoring quality and service availability | Named brand and model, AC kW, number of MPPTs, string layout | "Hybrid inverter, 10 kW" |
4 | DC:AC ratio | Explains why array kWp exceeds inverter kW; NREL calls it the inverter loading ratio, the ratio of aggregated module capacity to aggregated inverter capacity (NREL) | Ratio stated and justified for your roof and load profile | Not mentioned; array and inverter sizes simply differ |
5 | Mounting system and corrosion spec | Coastal Dubai and Abu Dhabi roofs sit in a high-chloride atmosphere; ISO 9223 category C5 covers marine environments within a few hundred metres of the ocean, with very high corrosivity (American Galvanizers Association) | Rail material and alloy, fixing type, ballast or penetration detail, corrosion class | "Aluminium mounting structure" |
6 | DC and AC cabling, isolators, protection | Safety and inspection pass depend on it; DEWA requires an isolation procedure displayed and secured at the main switchboard, and functional checks of all protections (DEWA connection conditions) | Cable sizes and type, DC and AC isolators, earthing, surge protection, labelling | "Complete BOS included" |
7 | Monitoring and access | Without it you cannot verify the performance estimate you were sold | Portal or app named, data retention, whether you get owner-level login | "Monitoring included" |
8 | DEWA application, inspection and metering scope | Confirms who does the paperwork and who pays the fee | Contractor's DEWA enrolment stated; the AED 1,500 connection fee named and allocated | Silent on DEWA, or "approvals subject to authority" |
9 | Structural and roof works | The most common source of post-signature variation orders | Roof condition assessment, waterproofing treatment, any strengthening priced or explicitly excluded | Nothing on the roof at all |
10 | Performance estimate and assumptions | An output figure without assumptions cannot be checked | Annual kWh, specific yield in kWh/kWp, plus soiling, temperature and shading assumptions stated | "Save up to 90% on your bill" |
11 | Warranties, split by type | Four separate promises are often collapsed into one number | Module product years, module performance curve, inverter years plus extension price, workmanship years — each with the party who honours it | "25-year warranty" |
12 | Commercial terms | Determines your exposure if the project stalls | Payment milestones, exclusions list, O&M years and cleaning frequency, VAT treatment, validity period | "50% advance, balance on completion" |
Holding two or three of these already? Request free quotes through SolarQuote for a Dubai or Abu Dhabi property — one form, quotes direct from installers, no markup and no obligation.
Equipment specification: what "named and specific" looks like
The single highest-value edit you can make to a quote is to force hardware names onto the page.
Module wattage multiplied by quantity gives kWp, and kWp is the unit that makes AED figures comparable. If a quote states only a rounded kW, you cannot check the arithmetic or the price per watt.
Model codes also let you read the datasheet yourself. A current N-type module datasheet states its temperature coefficient of maximum power — for example −0.30%/°C with a nominal operating cell temperature of 45 ±2°C on one Jinko Tiger Neo series (JinkoSolar), and −0.29%/°C with NOCT 43 ±2°C on a Trina Vertex series (Trina Solar). In UAE summer conditions that coefficient is not a footnote, and it is only checkable if the model is named.
On the inverter, ask for the AC rating and the brand's regional service arrangement. Coastal siting can matter to the warranty itself: Sungrow's terms limit the inverter warranty period for units installed close to the coastline, and void it for non-C5 enclosures installed within 2 km of the coast (Sungrow). If your villa is near the water, that clause belongs in the conversation before signing, not after.
Equipment also has to satisfy DEWA's technical standards. DEWA publishes a non-exhaustive list of eligible equipment meeting its standards, while stating explicitly that the list is not an endorsement or warranty and should not be the only basis for purchasing decisions (DEWA connection conditions). Compliance is your installer's responsibility to confirm — a fair question is simply "is every item in this quote compliant with DEWA standards for grid connection".
One more sizing constraint worth knowing about, because it occasionally explains why an installer proposes a smaller array than you expected: in a plot, PV capacity is capped as a share of Total Connected Load — 100% of the first 100 kW of TCL, 75% for the 100–200 kW slab, 50% for 200–400 kW, 25% for 400–600 kW and 5% above 600 kW, with an overall ceiling of 1,000 kW (DEWA connection conditions). This matters mostly to commercial and industrial buildings.
Warranties: four promises, not one
"25-year warranty" is the most misread phrase in solar quoting. There are four distinct promises, and they are honoured by different parties.
Module product warranty covers defects in the panel itself. On real datasheets this is shorter than the headline: 12 years on one Jinko Tiger Neo series (JinkoSolar) and 15 years on a Trina Vertex series (Trina Solar).
Module performance warranty is the long one, and it is a curve rather than a promise of no decline. Both of those datasheets state a 30-year linear power warranty with annual degradation of 0.4% and a guaranteed 87.4% of nameplate output at year 30; Trina states 1% first-year degradation (Trina Solar), and Jinko publishes the 30-year linear power warranty across its Tiger Neo range (JinkoSolar). A quote that cites "25 years" without saying which of the two it means is not telling you much.
Inverter warranty is shorter and often extendable at a stated price. Sungrow's published APAC term for string inverters bought through authorised dealers is 5 years from first installation, with extension options available for specific ranges up to a total of 25 years, purchasable at original purchase, within the first year after installation, or within the manufacturer warranty — and not after it lapses (Sungrow). Ask for the extension price now, while the window is open.
Workmanship warranty is the installer's own promise on the installation: mounting, penetrations, waterproofing, cabling, labelling. Manufacturers do not cover it. This is the warranty most exposed to a contractor changing shape, so ask how many years, what it excludes, and what happens if the company is restructured.
Performance estimates: how to sanity-check the yield
A credible estimate states annual output in kWh, the implied specific yield in kWh/kWp per year, and the assumptions behind it.
For orientation, DEWA states that the favourable fixed-tilt orientation in the UAE is south at roughly 24 degrees inclination, which allows annual irradiation of about 2,100 kWh/m² in Dubai including direct and diffuse radiation (DEWA). Published performance data for the region gives you a rough reference point too: one peer-reviewed regional performance paper cites a specific yield of 4.7 kWh/kW/day for a building in Abu Dhabi (Renewable Energy and Environmental Sustainability). Treat any single figure as indicative only — real output depends on your roof, orientation, shading and cleaning regime.
Then check three deductions are present and named:
Soiling. A peer-reviewed review of dust effects reports PV power losses of 0.29–12.7% in field measurements taken in the UAE over seven months, and notes that heavy dust accumulation without cleaning can cut output by more than 50% (International Journal of Energy Production and Management). A quote with no soiling allowance is optimistic by construction. Our guide to panel cleaning and dust losses goes deeper.
Temperature. The module's Pmax coefficient and NOCT should be reflected in the model, not ignored.
Shading. Water tanks, parapets, AC condensers, neighbouring villas and palms. If the estimate contains no shading loss, ask whether a shade analysis was actually run.
Finally, note the language. An estimate is an estimate. A savings figure presented as a guaranteed outcome is a commercial claim, not an engineering one.
Want the same 12 line items across several proposals? Compare quotes from installers covering Dubai and Abu Dhabi — free to you, with no mark-up added to installer pricing.
Commercial terms: payments, exclusions, VAT and validity
This is where quotes differ most and disclose least.
Payment schedule. Look for milestones tied to events you can verify: contract signature, material delivery to site, mechanical completion, DEWA inspection passed, commissioning and handover. A large advance with no delivery milestone leaves you carrying the risk.
Scope exclusions. The exclusions list is the most valuable paragraph in the document. Ask explicitly about roof repair and waterproofing, structural strengthening, distribution board upgrades, civil works and cable trenching, scaffolding and access equipment, crane or hoisting, community NOC fees, and authority permit fees. "Excluded" written down beats "included" implied.
DEWA fees. DEWA charges a standard one-off connection fee of AED 1,500 per renewable generator, mainly covering procurement and installation of the PV generation check-meter; for individual projects below 10 kW the check-meter is not mandatory and a customer may waive it by signing an undertaking, with reduced connection fees applying (DEWA connection conditions). The bi-directional tariff meter is installed by DEWA without additional cost beyond normal service charges (DEWA).
O&M and cleaning. DEWA's connection conditions require the producer to hold a valid maintenance contract with a DEWA-enrolled contractor covering inspection at least once every 12 months, with DEWA recommending inspection every six months, and routine maintenance including panel cleaning at least once a year; inspection reports and proof of a valid maintenance contract must be provided within five working days on request (DEWA connection conditions). So O&M is not an upsell to shrug at — it is part of staying compliant. Ask how many years are included, how many cleaning visits per year, and the renewal price after the included period.
VAT. The UAE standard VAT rate is 5%, introduced on 1 January 2018 (UAE Ministry of Finance). A quote should say whether its headline figure is inclusive or exclusive. Two otherwise identical prices, one plus VAT and one including it, differ by 5% before you have compared a single component.
Validity period. A stated validity window is normal and helpful. A deadline shorter than the time it takes to receive competing quotes is a sales tactic.
On price itself: installer-published Dubai pricing for fully installed residential grid-tied systems has been quoted in the AED 12,500–20,000 range for around 5 kW and AED 20,000–35,000 for around 10 kW (Solar Panel UAE), though these are one vendor's published figures and real quotes vary with roof type, access, brand and system size — always compare several. Our UAE installation cost breakdown sets out the components in more detail.
The 7 red flags
None of these means an installer is dishonest. Each means the quote is not yet comparable, and each has a specific question that fixes it.
1. No named module or inverter brand and model
"Tier-1 panels" and "hybrid inverter" are categories, not products. Without model codes you cannot read a datasheet or price like for like.
Ask: "Please state the exact module manufacturer, model code, unit wattage and quantity, and the inverter manufacturer, model and AC kW rating."
2. Savings presented as a guarantee
Output modelling is legitimate. A promised percentage cut to your bill is not, because it depends on your consumption pattern, tariff slab and cleaning discipline.
Ask: "Is this figure a modelled estimate or a contractual guarantee? Please state the annual kWh, the specific yield in kWh/kWp, and the soiling, temperature and shading loss assumptions used."
3. No confirmation of DEWA enrolment
In Dubai this is not optional. A system installed outside the DEWA-enrolled contractor scheme is not eligible for grid connection or net metering (DEWA).
Ask: "Please confirm in writing that your company is a DEWA-enrolled Electrical and DRRG Solar PV contractor, and that the DEWA application, inspection coordination and metering are in your scope."
4. Vague or absent exclusions
"Subject to site conditions" transfers unpriced risk to you. Variation orders most often arrive for roof works, DB upgrades and access equipment.
Ask: "Please list all exclusions explicitly, including roof repair and waterproofing, structural strengthening, DB upgrade, civil works, scaffolding and access, community NOC fees and authority permit fees."
5. Pressure discounts with short deadlines
A price that expires before you can reasonably compare alternatives is a negotiating device. A genuine validity period does not require you to decide tonight.
Ask: "What is the validity period of this quote, and will the same price and scope be available in three weeks?"
6. A single warranty number with no performance detail
The product warranty, the performance curve, the inverter term and the workmanship cover are four different things with four different guarantors.
Ask: "Please state module product warranty years, module performance warranty years with the linear degradation figures, inverter warranty years and the price of any extension, and your workmanship warranty years — and who honours each."
7. No O&M scope
Given DEWA's requirement for a valid maintenance contract with an enrolled contractor and at least annual inspection (DEWA connection conditions), a quote that ignores maintenance is incomplete rather than cheap.
Ask: "How many years of O&M are included, how many cleaning visits per year, what does the annual inspection cover, and what is the renewal price afterwards?"
Copy-paste: the questions to send back
Send this as one message to each installer. Identical questions produce answers you can line up in a column.
Thank you for the proposal. To compare fairly, please confirm the following in writing: 1. Module manufacturer, exact model code, unit wattage and quantity; total array size in kWp. 2. Inverter manufacturer, model, AC kW rating, number of MPPTs and the DC:AC ratio. 3. Mounting system material, fixing method and corrosion specification. 4. DC/AC cable specification, isolators, earthing, surge protection and labelling. 5. Monitoring platform, and whether I receive owner-level login and data access. 6. Confirmation that you are a DEWA-enrolled Electrical & DRRG Solar PV contractor, and that the DEWA application, inspection coordination and metering are within your scope. 7. Which authority permits are included, and who pays the DEWA connection fee. 8. Estimated annual output in kWh and specific yield in kWh/kWp per year, with the soiling, temperature and shading loss assumptions used, and confirmation this is an estimate. 9. Module product warranty years; module performance warranty years with degradation figures. 10. Inverter warranty years, price of extension, and workmanship warranty years — and who honours each. 11. Full exclusions list: roof repair/waterproofing, structural strengthening, DB upgrade, civil works, scaffolding/access, crane, community NOC fees, permit fees. 12. Payment milestones tied to verifiable events. 13. Years of O&M included, cleaning visits per year, inspection scope, renewal price. 14. Whether the quoted price includes 5% VAT, and the quote validity period.
Frequently asked questions
How do I compare solar quotes in the UAE when the system sizes differ?
Convert everything to kWp first — module wattage multiplied by quantity — then compare price per kWp alongside hardware brands, warranty terms and included O&M. A cheaper price per kWp with unnamed modules, no performance warranty detail and no maintenance is not actually cheaper.
Does a Dubai solar quote have to include DEWA approval work?
In practice a turnkey quote should include it, because only DEWA-enrolled consultants and contractors may install and connect the system, and they submit the application, notify DEWA for inspection and coordinate metering and connection (DEWA). Your part is signing forms and providing documents. Confirm the AED 1,500 connection fee is either included or clearly named as payable by you.
Should a solar quotation in Dubai show VAT separately?
It should be unambiguous either way. The UAE standard VAT rate is 5% (UAE Ministry of Finance), so a price quoted exclusive of VAT will be 5% higher on the invoice than the number in the proposal.
What annual yield figure should a UAE solar proposal assume?
There is no single correct figure, and DEWA does not publish a required assumption, so treat any single number with caution. DEWA notes annual irradiation of about 2,100 kWh/m² for Dubai at south-facing 24-degree tilt (DEWA), and published regional performance data cites 4.7 kWh/kW/day for a building in Abu Dhabi (Renewable Energy and Environmental Sustainability). What matters more is that the installer states the assumptions behind their number.
Is a 25-year warranty on solar panels real?
Partly. The long term is normally the performance warranty — for example a 30-year linear power warranty guaranteeing 87.4% of nameplate output at year 30 on some current datasheets (JinkoSolar). The product warranty against defects is shorter, at 12 to 15 years on the datasheets cited here, and the inverter and workmanship warranties are separate again.
Is a quote without an O&M section a problem?
It is a gap to close rather than a disqualification. DEWA's connection conditions require a valid maintenance contract with an enrolled contractor, covering inspection at least every 12 months and routine maintenance including panel cleaning at least annually (DEWA connection conditions). Ask for it to be priced in writing.
What to do with the quotes on your desk tonight
Open each PDF, and write "not stated" against every one of the 12 line items it omits. That list — not the headline price — is your agenda for the follow-up email.
Then send the copy-paste questions above, unchanged, to every installer. Whoever answers precisely and without irritation is telling you something useful about how they will behave when your roof needs a variation order in month three.
If you would rather start from a level field, we can help with the first step. Our guide to choosing a solar installer covers the vetting side, and DEWA's approval sequence is set out in our Shams Dubai approval walkthrough.
Ready to gather comparable proposals? Request free solar quotes for your Dubai or Abu Dhabi property — one form, quotes direct from installers in our network, no markup and no obligation to proceed.
