Exide STAR 12V 1050VA vs Luminous Optimus 1250+
Two 12 V home inverters of about the same size, side by side on the specs each maker states. They differ on rating, max charging current.
- Specs from makers’ pages
- Backup worked out the same way for both
Side by side
“Not stated” means the maker’s page doesn’t give it, not that the inverter lacks it.
| Exide STAR 12V 1050VA | Luminous Optimus 1250+ | |
|---|---|---|
| Rating | 1050 VA | 1100 VA / 924 W |
| Battery | 12 V | 12 V |
| Output wave | Pure sine wave | Pure sine wave |
| Max charging current | 13 A | 18 A |
| Lithium support | Not stated | Not stated |
| Warranty | Not stated | 36 months |
| Comfortable load | 672 W | 739 W |
| Backup at 300 W, 1 × 150 Ah | 4 h 05 min | 4 h 05 min |
| Source | Exide product page | Luminous product page |
What actually differs
- Luminous Optimus 1250+ charges at up to 18 A against 13 A, so after a long cut it refills a 150 Ah battery about 28% faster. Useful where cuts come back to back.
Which homes each one runs
From the running load of each set with a 25% margin, against each inverter’s VA.
| Home or load | Needs | Exide STAR 12V 1050VA | Luminous Optimus 1250+ |
|---|---|---|---|
| 1 BHK home | 431 VA | Yes | Yes |
| 2 BHK home | 811 VA | Yes | Yes |
| 3 BHK home | 1048 VA | Yes | Yes |
| 4 BHK or independent house | 1528 VA | No | No |
| Refrigerator | 263 VA | Yes | Yes |
| 1 HP water pump | 1200 VA | No | No |
| Air cooler | 728 VA | Yes | Yes |
| Work from home | 473 VA | Yes | Yes |
| Small shop | 609 VA | Yes | Yes |
| 1.5 ton AC | 2372 VA | No | No |
What each adds to your bill
At half its comfortable load. Standby is 1% of rated watts, an assumption: no Indian brand publishes it.
| Exide STAR 12V 1050VA | Luminous Optimus 1250+ | |
|---|---|---|
| Running 336 W / 370 W, 2 h of cuts a day | 37.5 units a month | 41.3 units a month |
| of which standby | 6 units | 6.7 units |
Backup
Backup depends on the battery, not the inverter brand: with the same batteries and load, both give about the same hours.