The problem: In many countries the power supply is available but in a very inadequate quality. Overvoltages destroy the lamps and also other devices, power failures cut crash the Computer-Software. This is especially critical for medical devices. For this reason, different devices are used to prevent this. Small gasoline emergency generation sets, however, that produce noise, are very ineffective, have to be started by hand and do not work without interruption (Computer !). Therefore additionall a USV (Uninterruptible Power Supply) is used. But these keeps up the Power Supply for only about 10 Minutes. Is there a more simple and cheap solution for this?

Power inverter produce from a Battery-Voltage 230 Volt. They got meanwhile extreme cheap. (300 W device for just 75 $). With a small additional device (from Alternative Technology) you can built up a safe Power Supply with the following features.

 Overvoltage monitoring and automatic switchover to save Power-Supply

 Low voltage monitoring and immediate and uninterruptible switchover to save Power-Supply (no Computer crash )

 Adjustable Voltage values for the changeover at under. - and overvoltage

 Line filter against voltage peaks

 Any number and models of 12 or 24 Volt-batteries can be used. Starter batteries, lead gel accumulators etc. With that you can freely design your battery storage

 Reloading of the batteries with a cheap but Powerfull loading device

Thus a simple, economical and safe Power Supply is available that can easily be extended.

In the middle you see the switch box. Left hand the Inverter and at the back the battery. Right side loading device