Stairlift 11
Stairlift 11 : AC and DC Power: Early stairlifts mostly had alternating current (AC) drive motors which ran at full mains voltage (around 100 volts in North America, 230 volts in Europe). An "energy chain" ran alongside or through the rail to carry the power cable from the supply point to the carriage. More recently, domestic stairlifts have been powered from rechargeable batteries and use direct current (DC). One of the selling points is that a DC stairlift will continue to function during a power outage, provided the batteries are sufficiently charged. Most stairlifts have a 'chargepoint' where the unit will 'park' to charge its batteries. Some straight stairlifts have the ability to continuously charge no matter where they are left along the track. With most DC models the batteries are accommodated within the carriage and travel with it. Some models, however, were designed with three phase motors and the batteries (three in total) were housed in a cabinet mounted near the top or bottom of the rail. An inverter system was used to convert the DC energy to three phase AC. The power rating of drive motors for domestic straight rail stairlifts may be around 250 watts. The power requirement will be greater for heavy loads, very steep inclines, and wheelchair platform stairlifts
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