An old unit but getting 12-month warranty for the battery and for the price of 130 € including an SNMP communications card.
These are also simple and easy to fix if they go wrong.
It is the same model as one that I have had on my eBay watchlist for a year, but haven’t bought it because of 200€+ price. This is locally available so no postage. Pure sinewave, which is the only one to really consider.
Expecting the new infrastructure take perhaps 420 watts, which would give maybe 20 minutes. More than enough to save everything and even wait for the power to come back.
I have a halogen lamp hooked to the device and the light level is clearly oscillating. So either it isn’t pure sinewave, or it is doing poor job regulating. Could be old caps. But I don’t have tools to diagnose the problem so for now I just have to trust that the power is good. That’s a poor predicament but what can I do.
Charges at 75W so definitely not happy with that. At that rate it will take 10 hours, or so, to recharge. Perhaps this is the way all UPS work but that feels like poor performance. Perhaps it has something to do with battery design or longevity of the batteries, or the battery technology.
First of all I must say that whenever you can: get a dual PSU machines; there were no distractions to my main server when the UPS was plugged between the machine and the wall outlet, while another server with single power supply suffered from me not being even close fast enough in switching the power.
But this UPS isn’t for keeping the machines up and running for a long time, that is for sure. The batteries were completely drained after only maybe three minutes. So either the batteries aren’t the best or time went by really fast. But I will be doing complete test down to 1 bar of capacity once the batteries have recharged. Also seriously considering to get another one since the man said he has plenty of these. And the price is on the spot.
More about the current setup
So the way I have set things up is like this, looking from the wall outlet onwards:
- Ground fault circuit interrupter
- Power meter
- Overcurrent protector
- Sensitive devices
So the idea is that if there is current leaking to wrong places, then the ground fault circuit interrupter will save lives and hopefully prevent fires, and when everything works correctly, the power meter will measure the power usage, the overcurrent protector will protect the UPS, and the UPS will protect the devices (secondary function) and provide them power if utility power fails.
The location of power meter is probably wrong because it is now receptive to overcurrent, and could in such situation cause fire. So it will be moved between the overcurrent protector and the rest of the system.
The power usage of this model, by the way, is about 40W idle. AFAIK it is line-interactive and not online so not sure where it puts all that power. 40W is quite a bit.
The noise is practically non-existent. Maybe if you have 100% silent setup, then the noise might be overpowering, but for anyone buying devices like these then no, not really a concern.