petercts Posted February 10, 2016 Share Posted February 10, 2016 a 2.5 amp current will end up ok, think about a car battery this will be like leaving side lights on day and night this will be a constant current drain is not like the max current required to start car batt's are sold in starting amp requirement on a cold day ie amps output for a very short period. leisure batt's are used for caravan and boat lights etc lower current for a longer period this worked for a long weekend ok it needs some form of trickle charge to try and stop the volt drop as i said in previous post used solar panel Quote Link to comment Share on other sites More sharing options...
datadiffusion Posted February 11, 2016 Share Posted February 11, 2016 (edited) Generator for temporary mains supply seems sensible? Agreed but if it's in the middle of a city centre like some of my customers, poor road access, no 'outside' other than the street, or office between one above and below etc... If it's an industrial estate or the like seems a very sensible option. Because he hasn't used leisure batteries perhaps , standard batteries you will need to many, they will drain quick and die What about a battery monitor send a low battery warning Agreed, if you really wanted to do this route than I see no other sensible option than a couple of large leisure type batteries. As far as using them vs. not using them, I also thought many maglocks went into 'power reduction' once the magnet had been attached? Edited February 11, 2016 by datadiffusion Quote So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted February 11, 2016 Share Posted February 11, 2016 Depending on the standby time you could have the geny on during daylight hours. When work is complete recommend the batteries to be replaced. I recommended this same thing for a customer that was having a three phase supply installed to replace a single phase supply. The system worked overnight and recharged on the geny during the day, was over a weekend IIRC. Worked well, replaced the 8x 7Ah in the ACU's the Monday after they had finished. RE mags, should have a constant current however there is a higher inrush when energising. Quote Link to comment Share on other sites More sharing options...
J&D Security Posted February 12, 2016 Share Posted February 12, 2016 (edited) https://www.batterystuff.com/kb/tools/solar-calculator.html Might help Jason Edited February 12, 2016 by J&D Security Quote janddsecurity@live.co.uk Link to comment Share on other sites More sharing options...
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