Crown Micro Elego Oyster 20kW Review — Three Phase HV Hybrid Inverter Pakistan 2026
MartOnline 15 min read
Most Pakistani businesses shopping for a 20kW three phase hybrid inverter are choosing between two options: the Inverex Nitrox 20kW at Rs 970,000 or the SAJ H2 20kW at Rs 685,000. Very few know a third option exists. The Crown Micro Elego Oyster 20kW Three Phase HV Hybrid Inverter is available at Rs 675,000 at MartOnline, making it the lowest-priced 20kW three phase HV hybrid inverter currently available from a stocking dealer in Pakistan as of October 2026.
This review covers the complete specifications from the official Crown Micro datasheet (model EOI-OYS-20KW-3PHV), real load capacity for Pakistani commercial properties, the HV battery requirement explained plainly, a direct comparison against Inverex and SAJ at the same power level, and an honest verdict on who should and should not buy this inverter.
Crown Micro Elego Oyster 20kW — Quick Verdict
The Crown Micro Elego Oyster 20kW is the best value 20kW three phase HV hybrid inverter available in Pakistan in 2026. At Rs 675,000 it is Rs 295,000 cheaper than the Inverex Nitrox 20kW and Rs 10,000 cheaper than the SAJ H2 20kW, while delivering IP66 ingress protection against IP65 on the Inverex and 97.4% maximum efficiency. The trade-off is a genuine one: it requires an HV battery bank operating at 100V to 800V, not the standard 48V LV batteries most Pakistani installers are familiar with. For commercial buyers with an experienced installer, this is the rational choice at this power level. For buyers in smaller cities without access to HV-capable installers, Inverex remains the safer option despite the higher price.
At a glance:
| Specification | Value |
|---|---|
| Price | Rs 675,000 |
| Output | 20kW Three Phase |
| Max PV Input | 30,000W |
| MPPT | 3 channels (2:2:2) |
| Battery | HV 100V to 800V |
| Efficiency | 97.4% |
| IP Rating | IP66 |
| Warranty | 5 years (10 years optional) |
| Parallel | Up to 10 units |
| Best for | Offices, factories, schools, petrol pumps |
Full Specifications — EOI-OYS-20KW-3PHV
All specifications sourced from the official Crown Micro Elego Oyster datasheet, model EOI-OYS-20KW-3PHV. Prices verified at MartOnline, October 2026.
| Specification | Value |
|---|---|
| Rated AC Output Power | 20,000W |
| Max PV Input | 30,000W |
| MPPT Channels | 3 (2:2:2 configuration) |
| MPPT Voltage Range | 200V to 900V |
| Max PV Input Voltage | 1,000V |
| Max PV Input Current per MPPT | 40A / 40A / 40A |
| Battery Voltage Range | 100V to 800V HV |
| Rated Battery Voltage | 400V |
| Max Charging Voltage | 800V |
| Max Charge/Discharge Current | 75A |
| Max Charge/Discharge Power | 20,000W |
| Rated AC Output Current | 29A |
| Output Voltage | 3L/N/PE, 230/400Vac |
| Rated Frequency | 50/60Hz |
| Max Efficiency | 97.4% |
| Charge/Discharge Efficiency | 97.2% |
| Switching Time | 10ms or less |
| Surge Power | 1.5Pn, 5 minutes |
| Unbalanced Load Support | 150% per phase |
| Parallel Operation | Up to 10 units |
| GEN Port | Yes, dedicated auto GEN control |
| AC Coupling | Yes |
| Display | Touch color screen |
| Communication | RS485 / WiFi / CAN |
| IP Rating | IP66 |
| Weight | 50kg |
| Dimensions | 480 x 703 x 258mm |
| Operating Temperature | -25 to 60 degrees C |
| Noise | Under 50dB |
| Cooling | Smart cooling |
| Topology | Transformerless |
| Warranty | 5 years (10 years optional) |
| Battery Type | Lithium-ion / Lead-Acid |
What Does 20kW Three Phase Actually Power in Pakistan?
A 20kW three phase hybrid inverter distributes its output across three separate electrical lines at approximately 6.7kW per phase under balanced load conditions. The Crown Micro Elego Oyster 20kW supports 150% unbalanced load per phase, meaning one phase can carry up to 10kW when the other two phases are carrying less. This specification matters in real Pakistani commercial environments where load is never perfectly balanced across phases — one phase may carry the server room and another the air conditioning.
Commercial load sizing table — Pakistan:
| Property Type | Typical Connected Load | Oyster 20kW Suitable? |
|---|---|---|
| Medium office, 5 to 8 inverter ACs | 12 to 16kW | Yes, with headroom |
| Large office, 10 to 12 inverter ACs | 18 to 22kW | Yes at full rated load |
| Petrol pump with compressors and lighting | 15 to 20kW | Yes |
| School, multiple classrooms and admin | 12 to 18kW | Yes |
| Clinic or hospital ward | 10 to 16kW | Yes |
| Small factory, light assembly machinery | 15 to 22kW | Yes |
| Large factory, heavy motors above 25kW | 25kW and above | Consider the 30kW Oyster |
For properties with sustained loads regularly exceeding 20kW, the Crown Micro Elego Oyster 30kW at Rs 895,000 is the next step in the same series.
The 30,000W PV input capacity means this inverter accepts up to 30kW of solar panels across three independent MPPT strings. For a commercial property consuming 20kW during the day, a 25kW to 30kW solar array paired with this inverter can cover the majority of daytime load from solar alone, reducing grid dependence significantly even before the battery bank contributes.
The HV Battery Requirement — What Pakistani Commercial Buyers Must Know
The most important thing to understand about the Crown Micro Elego Oyster 20kW before purchasing is its battery architecture. According to the official EOI-OYS-20KW-3PHV datasheet, this inverter requires a high voltage battery bank with a voltage range of 100V to 800V DC at a rated voltage of 400V. Standard 48V LV batteries — including Pylontech Fidus, Crown LiFePO4, BYD Battery-Box, and GoodWe Lynx A — are not compatible and cannot be used with this inverter.
Why HV at 20kW commercial scale:
At 20kW output, a 48V LV system would require over 400A of battery current, demanding extremely thick and expensive DC cabling, generating significant heat, and reducing overall system efficiency. A 400V HV system achieves the same 20kW with only 50A of battery current, allowing standard commercial cabling, lower heat generation, and higher charge/discharge efficiency. This is why HV architecture is increasingly standard for commercial inverters above 15kW globally, and it is one reason the Elego Oyster 20kW performs at 97.2% charge/discharge efficiency.
Compatible HV batteries available at MartOnline:
The Sunwoda OASIS Flex 5kWh HV Battery Module at Rs 245,000 per module is the modular option. Each module adds 5kWh of HV storage and modules stack to build the required bank size. The Sunwoda OASIS Flex BDU at Rs 220,000 is the battery distribution unit required once for each bank regardless of how many modules are used.
The GoodWe BAT-S 51.2kWh High Voltage Commercial Battery at Rs 2,700,000 provides large-scale storage in a single unit for properties needing extended backup capacity.
Battery sizing guidance for the Oyster 20kW:
| Backup Requirement | Storage Needed | Sunwoda Modules | Approximate Battery Cost |
|---|---|---|---|
| 2 hours at 10kW average load | 20kWh | 4 modules plus BDU | Rs 1,200,000 |
| 4 hours at 10kW average load | 40kWh | 8 modules plus BDU | Rs 2,180,000 |
| 6 hours at 10kW average load | 60kWh | 12 modules plus BDU | Rs 3,160,000 |
| Large commercial single unit | 51.2kWh | 1 GoodWe BAT-S | Rs 2,700,000 |
Confirm battery protocol compatibility with your installer before ordering. HV systems require certified electrical installation and DISCO inspection for net metering approval.
Crown Micro Elego Oyster 20kW vs Alternatives — Honest Comparison
At Rs 675,000, the Crown Micro Elego Oyster 20kW is the lowest-priced 20kW three phase inverter in MartOnline's range. Here is how it compares against the two most purchased alternatives at this power level in Pakistan:
| Specification | Crown Micro Elego Oyster 20kW | Inverex Nitrox 20kW | SAJ H2 20kW |
|---|---|---|---|
| Price | Rs 675,000 | Rs 970,000 | Rs 685,000 |
| Battery Architecture | HV 100V to 800V | LV 48V | LV 48V |
| Max PV Input | 30,000W | 30,000W | 40,000Wp |
| MPPT Channels | 3 | 2 | 2 |
| Max Efficiency | 97.4% | 97.6% | 98.5% |
| IP Rating | IP66 | IP65 | Not confirmed |
| Unbalanced Load | 150% per phase | 100% unbalanced | Not confirmed |
| Parallel Units | Up to 10 | Up to 10 | Not confirmed |
| Warranty | 5 years (10 optional) | 5 years | 5 years |
| Local Service | Crown Micro Pakistan | Inverex Pakistan | SAJ via dealers |
Where the Crown Micro Elego Oyster 20kW wins:
Price is the clearest advantage over Inverex. At Rs 295,000 less than Inverex and Rs 10,000 less than SAJ, the saving over Inverex is material at commercial scale. IP66 versus the Inverex's IP65 means better protection in dusty factory environments, outdoor installations, and Pakistan's monsoon conditions. Three MPPT channels against two on both competitors gives more flexible solar array design, particularly on rooftops where panels face different directions or are partially shaded. The 150% unbalanced load support per phase is a genuine commercial advantage over the Inverex's 100% unbalanced specification.
Where competitors have an edge:
SAJ H2 20kW achieves 98.5% maximum efficiency against the Oyster's 97.4%, a 1.1% difference. Inverex has the strongest local service network in Pakistan, particularly in secondary cities and smaller towns where Crown Micro dealers may be harder to find. Both Inverex and SAJ use LV 48V battery architecture, making them simpler to install with widely available batteries and more familiar to most Pakistani installers.
Verdict by buyer type:
Choose the Crown Micro Elego Oyster 20kW if your priority is value, IP66 protection, and you have an experienced installer comfortable with HV systems.
Choose Inverex Nitrox 20kW if local service availability in your city is the deciding factor and the Rs 295,000 premium is justified by that confidence.
Choose SAJ H2 20kW if peak efficiency is the priority and you want LV battery simplicity with an internationally recognised brand.
Net Metering Compatibility
The Crown Micro Elego Oyster 20kW Three Phase HV Hybrid Inverter is compatible with net metering in Pakistan under NEPRA's Prosumer Regulations 2026. At 20kW it falls within the 25kW threshold, meaning no NEPRA Authority concurrence is required. The application goes directly through your local DISCO — LESCO, MEPCO, IESCO, FESCO, PESCO, or K-Electric depending on your location.
Three phase net metering requires a bidirectional three phase energy meter installed by your DISCO as part of the connection process. The HV battery architecture requires a certified electrical installer for the DISCO site inspection, as HV systems carry specific safety requirements that standard residential installers may not be qualified to certify.
Processing time varies by DISCO. LESCO typically processes three phase net metering applications in 6 to 10 weeks. Factor this timeline into your project schedule if net metering income is part of your financial case for the installation.
Installation Notes for Commercial Buyers
Weight and mounting: at 50kg the Elego Oyster 20kW requires two-person installation and a properly rated wall bracket or floor stand. The 480 x 703 x 258mm dimensions require adequate wall clearance for ventilation and cable management.
Smart cooling: the cooling system activates automatically based on load and ambient temperature. In Pakistan's summer conditions where ambient temperatures regularly exceed 40 degrees C, smart cooling reduces fan noise and energy consumption compared to fixed-speed cooling systems. The operating temperature ceiling of 60 degrees C covers Pakistan's climate without derating.
GEN port: the dedicated generator port allows direct connection to a diesel generator for automatic generator control. When grid power fails and battery is depleted, the inverter automatically starts the generator, charges the battery bank, and switches back to battery plus solar when sufficient charge is reached. For factories and facilities with existing DG backup, this feature reduces diesel consumption significantly by using the generator only to charge the battery rather than running it continuously.
AC coupling: the AC coupling capability allows this inverter to be integrated with an existing grid-tied solar system. If your commercial property already has solar panels on a grid-tied inverter, the Elego Oyster 20kW can be added without replacing the existing setup, capturing the existing solar investment and adding battery backup capability.
Noise: under 50dB makes this inverter suitable for office and clinic environments where a noisy inverter would be disruptive.
Where to Buy Crown Micro Elego Oyster 20kW in Pakistan
The Crown Micro Elego Oyster 20kW Three Phase HV Hybrid Inverter is available at MartOnline at Rs 675,000. MartOnline has verified stock and nationwide delivery across Pakistan in 2 to 5 working days.
For commercial projects requiring HV battery bank sizing, installer referrals, or project consultation, contact MartOnline on WhatsApp before ordering.
Ground Floor, 246-E, Block-2, P.E.C.H.S, Karachi. Mon to Sat, 10am to 8pm.
Frequently Asked Questions
What is the price of Crown Micro Elego Oyster 20kW in Pakistan in 2026?
The Crown Micro Elego Oyster 20kW Three Phase HV Hybrid Inverter is priced at Rs 675,000 at MartOnline as of October 2026, making it the lowest-priced 20kW three phase HV hybrid inverter available from a stocking dealer in Pakistan. At this price it is Rs 295,000 less than the Inverex Nitrox 20kW Three Phase LV at Rs 970,000 and Rs 10,000 less than the SAJ H2 20kW at Rs 685,000. The price includes GST. Delivery charges vary by city and are confirmed via WhatsApp before dispatch. MartOnline has verified stock as of October 2026.
What battery is compatible with Crown Micro Elego Oyster 20kW?
The Crown Micro Elego Oyster 20kW requires a high voltage battery bank with a voltage range of 100V to 800V DC at a rated voltage of 400V, as specified in the official EOI-OYS-20KW-3PHV datasheet. Standard 48V LV batteries including Pylontech Fidus, Crown LiFePO4, BYD Battery-Box, and GoodWe Lynx A are not compatible. Compatible HV options available at MartOnline include the Sunwoda OASIS Flex 5kWh HV Module at Rs 245,000 per module requiring the Sunwoda BDU at Rs 220,000, and the GoodWe BAT-S 51.2kWh commercial HV battery at Rs 2,700,000. Confirm protocol compatibility with your installer before ordering, as HV systems require certified electrical installation.
How many ACs can a 20kW three phase inverter run in Pakistan?
A 20kW three phase hybrid inverter can run 8 to 12 inverter ACs simultaneously depending on their tonnage and the property's other loads. At balanced three phase load, the inverter delivers approximately 6.7kW per phase. The Crown Micro Elego Oyster 20kW supports 150% unbalanced load per phase, meaning one phase can carry up to 10kW when others are lighter. For a medium office with 8 x 1.5 ton inverter ACs drawing approximately 14kW total plus lighting and equipment, the 20kW Oyster handles this comfortably with 6kW of headroom. Properties with sustained loads regularly above 20kW should consider the Crown Micro Elego Oyster 30kW at Rs 895,000.
What is the difference between HV and LV inverters at 20kW commercial scale?
At 20kW output, a low voltage LV inverter uses a 48V battery bank requiring over 400A of battery current to deliver 20kW. This demands extremely thick DC cables, generates significant heat, and reduces efficiency. A high voltage HV inverter like the Crown Micro Elego Oyster 20kW uses a 400V battery bank, delivering the same 20kW with only 50A of battery current. Lower current means standard commercial cabling, less heat, higher efficiency, and lower installation cost at scale. The Crown Micro Elego Oyster achieves 97.2% charge/discharge efficiency as a result. HV architecture is increasingly standard for commercial inverters above 15kW globally, used by GoodWe, Solis, Sigenergy, and Huawei at commercial scale.
Is Crown Micro Elego Oyster 20kW approved for net metering in Pakistan?
Yes. The Crown Micro Elego Oyster 20kW Three Phase HV Hybrid Inverter is compatible with net metering in Pakistan under NEPRA's Prosumer Regulations 2026. At 20kW it falls within the 25kW threshold, meaning no NEPRA Authority concurrence is required. Applications go directly through your local DISCO — LESCO, MEPCO, IESCO, FESCO, PESCO, or K-Electric. Three phase net metering requires a bidirectional three phase energy meter installed by your DISCO. HV battery systems require a certified electrical installer for DISCO site inspection. Processing time varies by DISCO, typically 6 to 10 weeks for three phase commercial connections. Confirm the current net billing rate with your DISCO before designing your system around export income.
How does Crown Micro Elego Oyster 20kW compare to Inverex Nitrox 20kW?
The Crown Micro Elego Oyster 20kW costs Rs 675,000 against the Inverex Nitrox 20kW Three Phase LV at Rs 970,000, a difference of Rs 295,000. The Oyster has IP66 protection against Inverex's IP65, three MPPT channels against Inverex's two, and 150% unbalanced load support per phase against Inverex's 100%. The Inverex achieves marginally higher efficiency at 97.6% versus the Oyster's 97.4%, uses standard 48V LV batteries making installation simpler, and has a significantly stronger service network across Pakistan including secondary cities. The Oyster is the better financial choice for commercial buyers with experienced HV installers. Inverex is the better choice for buyers who need service confidence in smaller cities or prefer LV battery simplicity.
Also considering the larger model? Read the Crown Micro Elego Oyster 30kW Review — same HV platform, 45kW PV input, and Rs 2,655,000 cheaper than Inverex at 30kW.
Final Verdict
The Crown Micro Elego Oyster 20kW Three Phase HV Hybrid Inverter at Rs 675,000 is genuinely underpriced relative to its specifications and competition. IP66 protection, three MPPT channels, 97.4% efficiency, 150% unbalanced load support, and up to 10 units in parallel at this price point represents strong commercial value. The HV battery requirement is the only meaningful complexity — it adds cost and demands an experienced installer — but it is also a technical advantage at commercial scale, not a compromise.
For Pakistani commercial buyers with access to a qualified HV installer, this inverter deserves serious consideration over both Inverex and SAJ at the 20kW level. For buyers in smaller cities without HV installer access, Inverex remains the more practical choice.
Browse the Crown Micro Elego Oyster 20kW product page or use the MartOnline Solar Calculator to size your complete 20kW system including battery bank.
Questions on HV battery sizing, installer referrals, or system design? WhatsApp us at +92 324 3493060.
Specifications sourced from Crown Micro official Elego Oyster datasheet, model EOI-OYS-20KW-3PHV. Prices verified at MartOnline, October 2026. Competitor prices are MartOnline's own prices, October 2026.
