YES, intrested. how long does a full charge last? if u say more than 4.5 hours ill take it if u still got it next week (payday is the 22nd or 23rd I think)

A full charge can last for hours and hours and hours and hours.

I think what you all need to be asking is how long does it last with your specific load taking all variables in to consideration. Variables like not depleting the batteries to less than 50% as an example

Calculate your load - plug in the numbers - and you will come to the answer

The battery backup time in hours can be calculated using following formula:

Backup Time = Battery AH x 12V x N x Efficiency of Battery / Load in Watts

where,

Battery AH = Ampere Hour Capacity of Battery

N = Number of 12 V Batteries needed

Efficiency of Battery = Generally it is 0.8, which is the max. power factor of home standard

So...for the sellers bundle

Battery AH : 90 AH

Number of Batteries : 2

Load in Watts : 1200 Watt

Backup Time:

**1.44 hours**

This is the best case scenario - power is still drawn from the inverter which isn't factored in and calculation based on good battery health

Realistically you wont get close to 1.44 hours and that too - the 1.44hrs is based on completely depleting those batteries - which isn't good