Okaya POWER365 Home ESS: Inverter with Inbuilt Battery

Okaya POWER365 Home ESS is an inverter with inbuilt battery: a pure sine wave inverter and a lithium battery in one compact unit, so there is no separate battery to buy, place or maintain. It comes in two sizes, 1100 VA and 2500 VA, with zero maintenance, 25A fast charging, 2000+ charge cycles, an LCD that shows remaining backup time, built-in safety protection and a 5-year (60-month) warranty. This guide covers every feature, the specifications of both sizes, the Certified Backup Hours and how to choose between them.

What Is Okaya POWER365 Home ESS?

Okaya POWER365 is Okaya's lithium Home ESS (Energy Storage System) series: a home power backup unit that combines the inverter and the battery in a single enclosure. When the grid goes off, it switches to its integrated lithium battery and supplies pure sine wave power to the home; when the grid returns, it recharges the battery.

The integrated design is built around three everyday needs: low upkeep, simple installation and a clear view of how much backup is left. The features below show how POWER365 delivers each of them.

What Features Does Okaya POWER365 Offer?

POWER365 has nine features that matter in daily use. Each one is explained below with what it means at home.

Built-in lithium battery in one compact unit

The lithium battery is integrated with the inverter, so you do not buy, place or connect a separate battery. One compact unit saves floor space and removes the need to arrange cables between two products. It is a good fit for anyone searching for an inverter with lithium battery that works as a single, ready-to-use system.

Zero maintenance

The battery does not need water topping, and there is no routine upkeep to schedule.

2000+ charge cycles

A charge cycle is one full charge and discharge of the battery. POWER365 is built for 2000+ charge cycles, which means the battery is designed to handle a large number of outages and recharges before its performance declines.

25A fast charging

The built-in charger delivers up to 25A and charges the battery fully in about 4.5 to 5.5 hours. After a long power cut, the unit is ready again sooner, which lowers the chance of meeting the next outage with a low charge.

LCD display with battery status and remaining backup time

The front LCD shows battery status, charging progress and the estimated remaining backup time. You can see how much backup is available and decide which appliances to keep running, instead of guessing.

Pure sine wave output

POWER365 supplies pure sine wave power, which closely matches the supply from the grid and gives clean, stable power for TVs, laptops, routers, refrigerators and other modern appliances. The explainer on how a pure sine wave inverter works covers why the waveform matters for electronics.

Plug-and-play installation

Because the inverter and battery are already integrated, installation involves less wiring than a conventional inverter and battery pair. A simpler setup means less clutter and a faster, tidier installation.

Built-in safety protection

Safety is built into the unit in three ways. A built-in aerosol fire suppression system adds a further layer of protection inside the unit, AC and DC MCBs protect it from overloads and short circuits, and wiring fault protection guards against faults in the connected wiring. These are protections that stay in the background; for the household they simply mean an additional margin of safety around a product that sits in the home every day.

5-year (60-month) warranty

Both POWER365 sizes carry a 5-year (60-month) warranty, which gives long-term cover for a unit meant to run for years without routine servicing.

What Are the Specifications of Okaya POWER365?

POWER365 is available in 1100 VA and 2500 VA sizes. Both have a 100Ah integrated lithium battery, and the 2500 VA size uses a 25.6V battery against 12.8V in the 1100 VA size. The specifications of the lithium ion UPS in the larger size and the smaller one are compared below.

 How Long Does Okaya POWER365 Back Up at Different Loads?

At a 400W load, the 1100 VA size gives 3 hours 10 minutes and the 2500 VA size gives 5 hours 50 minutes of Certified Backup Hours. Lighter loads run longer, and heavier loads shorten the backup, as the two tables show.

Certified Backup Hours: Okaya POWER365, 1100 VA (hh:mm)

 Certified Backup Hours: Okaya POWER365, 2500 VA (hh:mm)

 Backup time in hh:mm, +/-5%. Tested on a fully charged new battery at 25 +/- 5 °C. Actual backup varies with the connected load, battery age and temperature.

To read the tables for your home, find the load column closest to the total wattage you plan to run during an outage.

Which Okaya POWER365 Size Does Your Home Need?

Choose the size by the total load you want to run during a power cut: the 1100 VA size is certified for loads up to 800W and the 2500 VA size up to 1600W. Add up the wattage of the lights, fans, router, TV and other appliances you would use at the same time, and compare it with the tables above.

If you are not sure of your load, Okaya's load calculator helps estimate it, and the guide on what size inverter a home needs explains how load and VA rating relate. A household with a few lights, fans and a router suits the smaller size, while a home that also needs to run a refrigerator, a TV and more appliances together can compare the larger size against its backup needs.

Where Can You Check the Price and Buy Okaya POWER365?

Current pricing and offers for both sizes are listed on the Okaya shop. You can view the inverter and battery price for the full Home ESS range, or go directly to the 1100VA inverter price or the 2.5 kVA (2500 VA) inverter price pages, where each size lists its warranty and specifications.

To see the product before you buy, use the Okaya dealer locator to find a dealer near you.

Conclusion

Okaya POWER365 Home ESS puts a pure sine wave inverter and a lithium battery into a single unit, removes water topping and extra wiring, and shows the backup you have left on its LCD. The 1100 VA and 2500 VA sizes come with Certified Backup Hours at four loads each, 2000+ charge cycles, built-in safety protection and a 5-year (60-month) warranty. Match your connected load to the backup tables, and you will know which size fits your home.

FAQs

What is Okaya POWER365?

Okaya POWER365 is a lithium Home ESS that combines a pure sine wave inverter and a lithium battery in one unit. It supplies backup power during outages and recharges when the grid is back, without a separate battery.

What is an inverter with an inbuilt battery?

It is a home backup unit in which the battery is built into the inverter enclosure, so you install one product instead of an inverter and a separate battery. Okaya POWER365 is an example, with an integrated lithium battery.

Which sizes does Okaya POWER365 come in?

It comes in two sizes: 1100 VA with a 12.8V 100Ah lithium battery, and 2500 VA with a 25.6V 100Ah lithium battery. Both have a pure sine wave output, an LCD display and a 5-year (60-month) warranty.

How long does Okaya POWER365 take to charge fully?

With 25A fast charging, the battery takes about 4.5 to 5.5 hours to charge fully.

How many hours of backup does Okaya POWER365 give?

At 400W, the 1100 VA size gives 3 hours 10 minutes and the 2500 VA size gives 5 hours 50 minutes of Certified Backup Hours. Lighter loads give longer backup and heavier loads give less. The figures are tested on a fully charged new battery at 25 +/- 5° C, with +/-5% tolerance.

How do I know how much backup is left?

The front LCD shows battery status, charging progress and the estimated remaining backup time, so you can plan which appliances to keep running.

Does Okaya POWER365 need water topping or regular maintenance?

No. The lithium battery is zero maintenance and does not need water topping.

How many charge cycles does the Okaya POWER365 battery have?

It is built for 2000+ charge cycles. A charge cycle is one complete charge and discharge of the battery.

Is Okaya POWER365 safe to use at home?

It includes a built-in aerosol fire suppression system, AC and DC MCBs and wiring fault protection. Its pure sine wave output also gives clean, stable power for sensitive electronics such as TVs, laptops and routers.

What warranty does Okaya POWER365 come with?

Both the 1100 VA and 2500 VA sizes come with a 5-year (60-month) warranty.

Which Okaya POWER365 size should I choose?

Choose by the total wattage you want to run together during an outage. The 1100 VA size has certified backup for loads from 200W to 800W, and the 2500 VA size from 400W to 1600W. Add up your appliance loads and compare them with the backup tables.