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[quote user="cabbage"]There are basically two types of UPS. In the constant draw type the mains is rectified fed to the batteries and the the batteries run the inverter -thus they are NEVER out of circuit. This EATS batteries and is normally reserved only for extreme emergency equipment (baby monitors and ICU equipment in hospitals for example). The normal standby type uses a charged bank of batteries with a detector that flips the circuit to the inverter and normal power is resumed (there may be a delay of 1/120th to 1/100th of a second before it operates fully).... regards ralph[/quote]Ralph,It is incorrect that this type of a system, if properly designed, eats batteries.  Any wear and tear on the batteries is caused by poor charger design.  Communications systems all over the world operate on float-charged DC systems, where the load is powered from the batteries directly, and a charger continuously maintains the proper voltage across the battery bank.  The result is that virtually no current goes into the batteris, and almost all of the current is used to serve the load.  Flooded lead acid batteries on such a system routinely operate for 40 years with nothing more than routine maintenance.It is a similar system that I propose to operate within a garden locomotive.Mark in Utah
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