3 ms·

That chart makes me annoyed that all UPSs under $1000 use SLA batteries. Where's my compact LiFePO UPS or same-sized UPS that lasts for an hour?

MichaelNolan 2y ago
How many kwh do you need? These are just over $1000 - https://signaturesolar.com/eg4-lifepower4-v2-lithium-battery-48v-100ah-server-rack-battery-ul1973-ul9540a-10-year-warranty/ https://signaturesolar.com/eg4-lifepower4-v2-lithium-battery...
- cogman10 2y ago
  Holy cow! 5kwh for $1k is amazing!
- aidenn0 2y ago
  That is not a UPS.
  - MichaelNolan 2y ago
    What’s the difference between a regular battery with a smart inverter and a UPS? It’s just that the UPS is an all in 1 box right? Or is there something else that a ups has?
    - aidenn0 2y ago
      Firstly, the linked battery doesn't have a smart inverter, so still not a UPS. An online UPS will also have a AC-DC converter (rectifier) in addition to the DC-AC converter (inverter). It usually also has fans to cool those since they are running continuously, even when AC power is available. An offline UPS is basically an online UPS with a relay, so that if the AC power is working, all of the UPS circuitry is bypassed. This reduces the usage of the DC electronics and increases the efficiency when power-loss is rare (since the AC->DC->AC path will always dissipate some power). A line-interactive transformer is like an offline UPS, but with voltage conditioning (e.g. via an autotransformer) to handle voltages that are a bit low or a bit high. Consumer UPSs are (almost all?) either offline or line-interactive.
criddell 2y ago
Something like this? https://www.amazon.com/GOLDENMATE-600W-Battery-Protector-Lifespan/dp/B0D5QTQKDQ https://www.amazon.com/GOLDENMATE-600W-Battery-Protector-Lif...
- aidenn0 2y ago
  That's more like it. However, if I can be picky, sketchy company that advertises it as being suitable for medical equipment when it's almost certainly not certified for such a use is a bit of a red flag for me (company contact info is "dobest021@sina.com").
  - aidenn0 2y ago
    They also claim UL certifications, but UL doesn't seem to have anything from that brand in their database.
aidenn0 2y ago
Someone not on HN pointed me to this: https://www.newegg.com/p/2FT-0001-006N3 https://www.newegg.com/p/2FT-0001-006N3 It's only 500VA, but it is under $1k.

MichaelNolan 2y ago

How many kwh do you need? These are just over $1000 - https://signaturesolar.com/eg4-lifepower4-v2-lithium-battery-48v-100ah-server-rack-battery-ul1973-ul9540a-10-year-warranty/ https://signaturesolar.com/eg4-lifepower4-v2-lithium-battery...

cogman10 2y ago
Holy cow! 5kwh for $1k is amazing!
aidenn0 2y ago
That is not a UPS.
- MichaelNolan 2y ago
  What’s the difference between a regular battery with a smart inverter and a UPS? It’s just that the UPS is an all in 1 box right? Or is there something else that a ups has?
  - aidenn0 2y ago
    Firstly, the linked battery doesn't have a smart inverter, so still not a UPS. An online UPS will also have a AC-DC converter (rectifier) in addition to the DC-AC converter (inverter). It usually also has fans to cool those since they are running continuously, even when AC power is available. An offline UPS is basically an online UPS with a relay, so that if the AC power is working, all of the UPS circuitry is bypassed. This reduces the usage of the DC electronics and increases the efficiency when power-loss is rare (since the AC->DC->AC path will always dissipate some power). A line-interactive transformer is like an offline UPS, but with voltage conditioning (e.g. via an autotransformer) to handle voltages that are a bit low or a bit high. Consumer UPSs are (almost all?) either offline or line-interactive.

criddell 2y ago

Something like this? https://www.amazon.com/GOLDENMATE-600W-Battery-Protector-Lifespan/dp/B0D5QTQKDQ https://www.amazon.com/GOLDENMATE-600W-Battery-Protector-Lif...

aidenn0 2y ago
That's more like it. However, if I can be picky, sketchy company that advertises it as being suitable for medical equipment when it's almost certainly not certified for such a use is a bit of a red flag for me (company contact info is "dobest021@sina.com").
- aidenn0 2y ago
  They also claim UL certifications, but UL doesn't seem to have anything from that brand in their database.

aidenn0 2y ago

Someone not on HN pointed me to this: https://www.newegg.com/p/2FT-0001-006N3 https://www.newegg.com/p/2FT-0001-006N3 It's only 500VA, but it is under $1k.