Kodak VMIII BL3.6 Lithium Ion Power Backup Kit - 5kW/3.5kWh Storage

Peak power output 5kW
Usable battery energy ~3.5 Units (kWhr)
Max continuous power from battery  5kW

Lithium ion batteries have the advantage over traditional lead acid in that they can be cycled many times more and can be discharged deeper while maintianing a decent battery life.

The Kodak battery in this kit has a 10 year manufacturers warranty for no additional charge.

For those not overly familiar with electrical power, this system can store around 3.5 Units of usable energy in the batteries.

This means that at during a power failure, you could watch a 250W TV for about 13 hours before the batteries went flat (250W x 1 hours = 3250Whrs = 3.25 Units of electricity)

OR

you could run 40 x 5W LED globes for 16 hours (5W x 40 x 16 hours = 320Whrs = 3.2 Units of electricity)

OR

a 1200W kettle for an 2.75 hours straight (1200W * 2.75 hour = 3300Whrs = 3.3 Units of electricity)

*Not sure why you would do that but who knows?*

OR

any combination of the above that adds up to 3.3 Units.

The system will switch from grid power to battery power automatically upon grid failure and automatically back to grid when power returns. The batteries will then automatically recharge.