Originally Posted By: adam2

the load to 50% of the rating if useing an external battery.
Also remember that there may be NO ISOLATION between the battery connections and the grid supply. There is therefore the potential for a fatal line voltage shock from the battery terminals. These must be regarded as line voltage connections and protected against being touched.


Not quite. UPS batteries are 12v, 24v, 48v DC, etc they are not the 120v AC line voltage so if there was no isolation between line voltage and the battery the battery would explode due to the too high of voltage. You need to be careful wround ups's due to multiple reasons, one is the battery charger may have chargec capactors that can zap you, second is the battery itsself can source a large amount of current (ever welded with a battery or seen a screwdriver vaporize due to being dropped across a big battery terminals) and the fact that even when unplugged there is still power at the output since thats the primary function of a UPS.
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