[quote=", post:, topic:"]
lets do some maths
3rd load bar represents the load is greater than 50% and less than equal to 75% (>50 & <= 75)
50% of 600w = 300w
75% of 600w = 450w
so it means ur load power consumption is in between 300w to 450w right
lets assume u r using a new 185AH battery
with 300w load u will get approximately 185min or 3.08hours backup time
with 450w load u will get approximately 123.3min or 2.05hours backup time
with 3th load bar u can get a backup time of 2 to 3 hours with 185AH battery (depending on ur battery condition)
if in case u r not geting backup time in between 2 to 3 hours it means ur Battery is Faulty & u need to replace it,
make sure there is hell of difference between Automotive & UPS battery,
Number of Hours Battery could run the Load:
Hours = 2220 Wh / 353 W = ~ 6 Hrs its wrong plz check ur calculations
Engr Asad Hameed
I used the standard calculation methods for Load Evaluation (book method). + as I mentioned in my post that the calculations are for IDEAL condition i.e, no battery loss , no load loss and depth of battery cycle being 100%, which is not the case in real life.
In short my calculations were for ideal conditions.
I am very curious about clearing my concepts related to this science, and would really appreciate if you could kindly give reference or details how you calculated the load.
For example u mentioned with 300w load u will get approximately 185min or 3.08hours backup time . By what formula or tables you deduced that? Also you mentioned 3rd Load Bar . what is it and in what case we use this condition ( 50% < x <75% ) and how ?
The calculations I used are what I learned from textbooks or web-tutorials etc.
I also want to ask that in our Residential Batteries it is mentioned that they are Deep Cycle, But it is NOT mentioned How Deep?. According to my knowledge there is a particular measure / specification for the depth of the cycle. That measure is DOD(Depth of Discharge) and is supposed to be b/w 50% - 80%.
I am aware that thr are differences in what is written in the books and the actual practices. Actual practices involves more Rules of Thumb rather than long accurate formulae. Can u please help me in that side as I am willing to clear my concepts in this science.
Thank you for your assistance
A curious fellow