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The silence of the racks is deafening, production gear has gone dark – so which wire do we cut?


I have accumulated a stack of half a dozen potato clocks over my years working for various MSPs and enterprises. All were replaced due to calendar life or failed batteries, so I take them home and put in fresh batteries and power my rack with them. I had a 5kVA one pop and let out the magic smoke. Similar story a few years later with a 3kVA one. I've now put another 3kVA one in place, but I've cobbled together a homemade giant battery pack for this one, 48V, using every SLA battery I could find. What could possibly go wrong...

I must say the runtime is now excellent, but I fear for the lifespan of the charger inside the unit.

I think the best learnings from it all would be to have two potato clocks installed, one per power supply/PDU, at no more than 30% load per unit. Allowing for 60% load if one pops, and preferably have each UPS on a different switchboard circuit.

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