Our take
The frozen source title names Panasonic NN-SN778S even though the model field is blank. Panasonic's official dimension comparison lists NN-SN778S as a 1.6-cu.-ft. microwave and shows NN-SN77HS separately, so retain the two codes as distinct products despite the shared dimensions. The NN-SN778 operating manual omits the final S on its cover, but its cooking, installation and power details align with the exact-model entry and a manual-library record uses the full suffix. Panasonic documents 1,250 W cooking output, 1,460 W consumption, Inverter Turbo Defrost, Sensor Reheat and Sensor Cook. The cabinet path is supported by listed trim-kit models NN-TK729S and NN-TK739S. The manual also requires a separate grounded 20-A circuit and specific countertop clearances. The exact finish and turntable diameter remain unverified, and Panasonic's two sources give slightly different weights. Historical Amazon ASIN B00TYSJYIS returned a cache miss, so this page links to an exact-model search.
A 1.6-cu.-ft. countertop model for a flat, stable surface with three inches at both sides and one inch overhead, powered by a separate grounded 20-A, 120-V/60-Hz circuit. Panasonic lists optional NN-TK729S and NN-TK739S trim kits for wall-cabinet installation; verify the kit opening and exact finish before purchase..
Avoid this model if your counter cannot provide three inches on both sides and one inch overhead, or if a dedicated 20-A circuit is unavailable. Do not use it for commercial service; Panasonic says household use only. The stainless finish is not confirmed by the reviewed sources.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- Panasonic documents Sensor Cook and Sensor Reheat separately from basic one-touch controls.
- Inverter Turbo Defrost is a named function with weight-based controls in the owner manual.
- The manual lists NN-TK729S and NN-TK739S trim kits for the wall-cabinet installation path.
- The exact NN-SN778S appears in Panasonic's dimension table with 1.6 cu. ft. capacity and concrete outside measurements.
What to weigh up
- A separate grounded 20-A, 120-V/60-Hz circuit is required; the manual warns against sharing it with another appliance.
- Counter placement needs three inches on both sides and one inch above, plus the door positioned back from the counter edge.
- The manual's cover omits the final S and Panasonic sources differ on weight; preserve the exact model distinction and leave weight unresolved.
- The turntable diameter and exact stainless finish are unverified, and the historic Amazon ASIN returned a cache miss.
The key details
| Model covered | NN-SN778S |
|---|---|
| Capacity | Capacity is 1.6 cu. ft.; the manual confirms a glass tray but no numeric turntable diameter |
| Microwave output | Cooking output is 1,250 W separately from 1,460 W consumption; supply is 120 V/60 Hz |
| Cooking approach | Inverter Turbo Defrost, Sensor Reheat and Sensor Cook are documented features |
| Installation options | Countertop placement requires three inches at each side, one inch above and a separate grounded 20-A circuit; optional wall-cabinet installation uses the listed proper trim kit |
| Finish and turntable | The model-specific sources do not state an exact finish; the historical stainless claim is unverified |
Performance figures are manufacturer claims. Source checked October 5, 2026. Regional models and included accessories can differ.
What the features mean for you
Resolve the missing source model from Panasonic's exact table
Although the frozen row leaves the model column blank, its title names NN-SN778S, and Panasonic's official dimension comparison lists that exact complete code. The same table lists NN-SN77HS as a separate model, even though both are 1.6 cu. ft. and have the same listed outside dimensions. The operating manual cover says NN-SN778 without the final S; a library record titles that manual NN-SN778S. This supports a model-specific entry while preserving the suffix boundary. Do not merge the two products based on shared measurements or a related manual family.
Use the capacity and outside measurements for space planning
Panasonic's table gives NN-SN778S 1.6 cu. ft. of capacity and outside dimensions of 21 7/8 inches wide, 11 15/16 inches high and 19 7/16 inches deep. Those dimensions should be compared with the counter and available upper space, while the installation guide separately requires side and top clearance. The manual shows a glass tray, but the reviewed maker sources do not supply a diameter, so a shopper who needs a specific dish measurement should not rely on a guessed plate size. The sources list weight as 31 lb. and approximately 31.5 lb.; that small discrepancy is left unresolved.
Compare cooking output with electrical consumption
The NN-SN778 manual reports 1,250 W cooking power separately from 1,460 W power consumption. It also specifies a 120-V, 60-Hz supply and 12.7-A draw, but requires the oven to operate on a separate, grounded 20-A circuit with no other appliance sharing it. Use the output figure in cooking-output comparisons; the larger consumption figure is electrical input, not microwave output. The circuit requirement is a practical constraint to confirm before selecting a counter location or outlet.
Treat sensor functions and inverter defrost as documented features
The manual provides separate Sensor Reheat and Sensor Cook procedures. Sensor reheat is described for cooked refrigerated food without setting a time, while Sensor Cook uses food categories and the oven's Genius Sensor. The Inverter Turbo Defrost feature asks for food weight and gives instructions for turning or rearranging larger items. These controls create a different route from a basic timed microwave, but the manual also gives use limits for sensor functions. They support the feature tags without implying that every food is handled automatically or that a personal cooking test was performed.
Leave the manual's ventilation and counter-edge space
The placement instructions call for a flat, stable surface, three inches of space at each side and one inch at the top. The front of the door should sit at least three inches back from the edge of the countertop to reduce tipping risk. Vents must remain open. These are countertop installation requirements and should be checked independently of the model's 1.6-cu.-ft. cavity rating. Panasonic says the oven is made for household use only and is not approved or tested for mobile, marine or commercial use.
Use the listed trim kits only with the matching opening
The manual describes wall-cabinet installation when the oven is designed for that use and the proper trim kit is used. Its specification table names Panasonic kits NN-TK729S and NN-TK739S and gives different cabinet openings for them. That documents a trim-kit path for this manual family, but the cabinet opening still must match the chosen kit and the exact appliance code. It does not make every built-in opening compatible or turn the microwave into an over-range model.
Keep the exact finish unknown
The frozen title calls this microwave stainless, but Panasonic's dimension comparison and operating manual do not state an exact NN-SN778S finish. The official table lists multiple sibling models separately, and shared size or manual material cannot establish a color. Keep the finish claim unassigned unless current exact-model documentation confirms it. Likewise, no numeric turntable diameter is available in the reviewed Panasonic sources. The approximate product weight is also not reduced to a single figure because Panasonic's manual and dimension table differ by half a pound.
Use the exact model search after the ASIN error
Historical Amazon ASIN B00TYSJYIS returned a cache miss when checked on 2026-10-05. That response does not identify a current offer, so the affiliate destination searches Panasonic NN-SN778S and includes buyershortlists-20. Check the exact suffix and desired trim kit in any result. No live price, stock, sales rank or buyer-review claim is based on the frozen row or owner manual.
What else to compare
For a smaller clearance envelope or a standard 15-A circuit, compare models whose manuals specify that fit. For cabinet installation, verify the exact Panasonic trim-kit model and cutout dimensions, and for foodservice select a microwave the manufacturer approves for commercial use. If finish or turntable diameter is a hard requirement, choose a model whose exact manufacturer documentation provides those facts rather than inferring them from a similar NN-SN77 code.
Before you buy
What capacity does Panasonic list for NN-SN778S?
Panasonic's exact-model comparison table lists the NN-SN778S at 1.6 cu. ft.
What cooking output and input power are specified?
The owner manual gives 1,250 W cooking power and 1,460 W consumption as separate ratings.
Does this microwave have sensor cooking?
Yes. The manual documents both Sensor Reheat and Sensor Cook, including food-category guidance.
What circuit and ventilation does the manual require?
It specifies a separate grounded 20-A, 120-V/60-Hz circuit, three inches at each side and one inch above.
Can it be installed in a wall cabinet?
The manual lists trim-kit models NN-TK729S and NN-TK739S for the cabinet installation path; match the opening to the kit.
Is it approved for commercial use?
No. Panasonic's manual says household use only and states that commercial use is not approved or tested.
Does Panasonic confirm a stainless finish or tray diameter?
The reviewed sources do not specify the exact finish or a numeric turntable diameter, so both remain unconfirmed.
Is NN-SN778S the same model as NN-SN77HS?
Panasonic lists NN-SN778S and NN-SN77HS separately despite shared dimensions, so the product codes remain distinct.
Does Amazon ASIN B00TYSJYIS currently identify this model?
The historical Amazon detail URL returned a cache miss; use the tagged exact-model search instead of a direct-ASIN claim.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources & review basis
We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- Panasonic NN-SN778 operating instructions; NN-SN778S model dimensions confirmed in Panasonic's comparison table ↗ — checked October 5, 2026.
- Panasonic USA microwave dimension comparison. Lines 279–280 individually checked 2026-10-05 list NN-SN778S and NN-SN77HS separately at 1.6 cu. ft.; the NN-SN778S exterior is 21 7/8(W) × 11 15/16(H) × 19 7/16(D) in. and table weight is 31 lb. ↗ — checked October 5, 2026.
- Panasonic NN-SN778 operating instructions. The cover names NN-SN778 without the final S; the exact NN-SN778S is independently listed in Panasonic's dimension table, and a Panasonic NN-SN778S manual-library record uses the suffix. Printed page 4 (PDF page 4), lines 208–228 documents flat-surface placement, three inches at both sides, one inch above, a three-inch front-edge setback, household-only use and wall-cabinet installation with the proper trim kit. Printed page 5 (PDF page 5), lines 253–258 requires a separate grounded 20-A, 120-V/60-Hz circuit. Printed page 29 (PDF page 29), lines 1675–1706 gives 1,460-W consumption, 1,250-W cooking power, 21 7/8 × 11 15/16 × 19 7/16-in. exterior dimensions, approximately 31.5-lb. weight and trim kit models NN-TK729S/NN-TK739S. Contents and controls document Inverter Turbo Defrost, Sensor Reheat and Sensor Cook. ↗ — checked October 5, 2026.
- ManualsDir library record title uses Panasonic NN-SN778S for the NN-SN778 operating manual. Used as a suffix cross-check; Panasonic's exact-model dimension table is primary identity evidence. ↗ — checked October 5, 2026.
- Historical Amazon ASIN page individually checked 2026-10-05 and returned a cache miss. It does not verify a current exact-ASIN destination; use the tagged exact-model search. ↗Paid link · We may earn a commission. — checked October 5, 2026.
The decision
Panasonic's exact table lists NN-SN778S as a distinct 1.6-cu.-ft. model, and the NN-SN778 manual documents 1,250-W cooking power, Sensor Cook, Sensor Reheat, Inverter Turbo Defrost and optional trim kits NN-TK729S/NN-TK739S. It requires a separate grounded 20-A circuit, three inches at each side and one inch above, and is for household use only. Finish and turntable diameter remain unknown. The historical ASIN failed to load, so use the tagged exact-model search.
Is it the right fit?
Check the exact model and today’s offers on Amazon.