DAVE IN KENT Posted March 28, 2008 Share Posted March 28, 2008 I know there is a formula out there for working out the sze of battery to use or for working out how long a battery will last without main's if anyone knows it can you enlighten me please. NSI GOLD BASED IN KENT INTRUDER,ACCESS CONTROL,CCTV,FIRE Link to comment Share on other sites More sharing options...
Guest anguscanplay Posted March 28, 2008 Share Posted March 28, 2008 I know there is a formula out there for working out the sze of battery to use or for working out how long a battery will last without main's if anyone knows it can you enlighten me please. er ? battery capacity divide by current drawn divide by hours, but to comply with EN you do the sums backwards to get max current available ie a 7amp battery will limit the panel current to 575ma Link to comment Share on other sites More sharing options...
spider Posted March 28, 2008 Share Posted March 28, 2008 http://www.riscogroup.co.uk/dynamicPage.aspx?id=87 Typical battery calculator that can be adpted for your requirements, (note the recommended discharge of a VRSLA battery is capacity divided 20 hour duration, a factor should allso be taken into account for the effect of ageing) Link to comment Share on other sites More sharing options...
esp-protocol Posted March 29, 2008 Share Posted March 29, 2008 The minimum capacity of valve regulated lead acid batteries should be calculated in accordance with the following formula: Cmin = 1.25 (T1 I1 + D I2/2) where Cmin = minimum capacity of the battery when new at the 20 h discharge rate and at 20 Link to comment Share on other sites More sharing options...
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