These chargers were inspired by a spell I spent working in security on a construction site. I designed them in response to a glaringly obvious problem which I encountered: the difficulty in charging mobile phones and other devices on construction sites where only a 110 volt AC supply is available. (For safety reasons, no normal mains sockets are available except in such areas as the site office and canteen; it is rare to encounter a site which will allow 230 Volt working.
For this reason, I built a switched mode circuit into a 16 amp connector of the type used on construction sites, and modified the connector to provide a standard USB socket. These chargers will charge the majority of USB devices, although they may not manage Ipads as they draw too much current. Phones, most tablets, and even some two way radios will charge from a 1 amp output however.
I have long been into electronics, it's about time I put it to good use. I got the idea from watching 400 contractors on the Amazon Liverpool site (LHR16, under construction in 2017) argue over 6 normal sockets in the canteen. I worked for Securitas UK Services LTD at the time, and charged my own phone and Hytera DMR radio from the site supply during the shift. Components were ordered from Shenzen, China using the Alibaba app. I sold some by mail order (a few paid for in EUR and shipped to Ireland, and some sold onsiite).
The charger plugs into the overhead cables, distribution box or directly into the transformer providing the 110 volt supply. I have now began production in 2017; Starting price is �25 or �24 per unit.
Please note, the devices are assambled individually. I have three units left - no more will be produced as I am to leave the UK shortly for pastures new. The RLV system is used in the UK and Republic of Ireland.
110 Volt Construction site Charger for USB devices
