I highly recommend a heavy-duty AVR to take care of voltage fluctuations. Nadamage na amoa sauna tungod sa welding/drill/etc.. We use heavy-duty AVR for our home theater and computer now. Also, na-save sa akong AVR akong cpu katong nashort circuit ang mga wires due to water exposure. Naa man gud ni sila fuse w/c is non-existent in generic AVRs (wala ba? I think.)