UPS using 230kWh/year on its own

[~Dude17~]

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I've got an Invensys/Best 1000VA UPS that is drawing 26.7W constantly
with the battery fully charged and no load connected. This is an
offline design and the inverter is not in use when AC power is
available. All is trickle charging battery in standby. What takes so
much power?

This thing dissipates so much heat for what it is that internal fan
comes on every once in a while just idling. Everything runs properly,
so I don't think it's a malfunction.

There is no reason for it to take 27W of constant power to keep 36V
9Ah pack charged. With battery fully charged, I averaged the power
usage to be 0.64kWh/day or 230.6kWh/year. A Whirlpool EnergyStar
compliant 22 cu. ft freezer/refrigerator takes 472kWh/year. Anyone
else see a problem with an offline 1kVA UPS using half as much power
as a full size fridge just to keep its battery charged? This is 1999
or 2000 model.

 

[Ken]

I've got an Invensys/Best 1000VA UPS that is drawing 26.7W constantly
with the battery fully charged and no load connected. This is an
offline design and the inverter is not in use when AC power is
available. All is trickle charging battery in standby.
What takes so much power?

Old batteries?

 

[Tom Biasi]

X-No-Archive: Yes

I've got an Invensys/Best 1000VA UPS that is drawing 26.7W constantly
with the battery fully charged and no load connected. This is an
offline design and the inverter is not in use when AC power is
available. All is trickle charging battery in standby. What takes so
much power?

This thing dissipates so much heat for what it is that internal fan
comes on every once in a while just idling. Everything runs properly,
so I don't think it's a malfunction.

There is no reason for it to take 27W of constant power to keep 36V
9Ah pack charged. With battery fully charged, I averaged the power
usage to be 0.64kWh/day or 230.6kWh/year. A Whirlpool EnergyStar
compliant 22 cu. ft freezer/refrigerator takes 472kWh/year. Anyone
else see a problem with an offline 1kVA UPS using half as much power
as a full size fridge just to keep its battery charged? This is 1999
or 2000 model.

What does the manufacturer say it should draw in standby?
Check your batteries too.

Tom

 

[~Dude17~]

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What does the manufacturer say it should draw in standby?
Check your batteries too.

Tom

Manufacture doesn't specify it in the specs. The batteries are new.
It maintains a float voltage of 41.5V, which is normal for 36V lead
acid float voltage and it's only drawing 40mA or so.

The unit supports battery hot swap, but true power meter continues to
register 25-27W whether or not battery is connected or not. I suspect
it's just a horribly inefficient design.