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 https://www.thesecurityinstaller.co.uk/community/topic/22750-working-out-what-battery-to-use/ 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 https://www.thesecurityinstaller.co.uk/community/topic/22750-working-out-what-battery-to-use/#findComment-193933 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 https://www.thesecurityinstaller.co.uk/community/topic/22750-working-out-what-battery-to-use/#findComment-193938 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 https://www.thesecurityinstaller.co.uk/community/topic/22750-working-out-what-battery-to-use/#findComment-194004 Share on other sites More sharing options...
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