The tank can be full to the brim and still useless without the pump. Taps run dry, toilets do not refill and the shower is off. If the house uses a UV steriliser, that stops too, so even water you gravity-feed from the tank is untreated. Families end up carrying buckets from the tank tap to flush the toilet and boiling water on the barbecue for drinking. It is one of the first things people notice in an outage.
Pressure pumps start and stop many times a day, with a short surge each time. The battery and 15 kW hybrid inverter are designed to handle those surges in UPS mode, so the pump never drops out and pressure stays steady. The fuel cell recharges the battery from stored hydrogen through a long outage, so the household has water for as long as the store and the tank both last.
How it works →
UV sterilisers need continuous power, and some need time to warm up after a restart before they treat properly. Keeping them on without a break avoids that gap. The system's electrolyser uses filtered, de-ionised water, about 9 litres per kilogram of hydrogen, and the fuel cell gives most of it back, so its draw on the tank is small. Round-trip efficiency is 30% or less, so this is about water security, not cheaper pumping.
Pressure pumps are moderate loads that start and stop often. The battery and inverter are designed to handle the start-up surges, and the fuel cell keeps the battery charged through a long outage.
It uses about 9 litres of filtered, de-ionised water per kilogram of hydrogen, and the fuel cell returns most of it to the loop. The draw on a household tank is small.
It is designed to keep running with no gap, because the battery and inverter work in UPS mode. That avoids the restart and warm-up period some UV units need after a power cut.
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