How to connect two dual twin Tripplite units as ONE?

[sigint787]

Is there a way to somehow connect/merge two seperate Tripplite units as one so that the server that I am running will still be powered even if any one of the two units fail or die? I thought about daisy chaining the units but that still leaves the slave unit as the point of failure, where the slave UPS is connected/plugged into to the master UPS, and the server box is plugged into the slave UPS... but if the slave UPS fails, the server still goes down even if the master UPS is still alive....

Is there a way to intercross the two dual UPS together to make them into one redundant system so that if any one fails the server will still be powered and the only way it will lose power is if both failed at the same time?

 

[Cerb]

AFAIK, no, you can't do that.

What you would need to do is specify your server to have a dual-input redundant power supply. Then, you just plug each UPS into each PSU.

 

[Red Squirrel]

Some UPS/inverters support this but you can't just do it with any one, as the AC phases wont be in sync. Best to just buy a bigger UPS or plug one in each server PSU as suggested.

 

[sigint787]

Some UPS/inverters support this but you can't just do it with any one, as the AC phases wont be in sync. Best to just buy a bigger UPS or plug one in each server PSU as suggested.

Are you saying some servers has TWO PSU in one box? But if I am only seeing one power cord coming out of the server then pretty sure it only has one PSU, right?

 

[Red Squirrel]

Yep most servers have dual PSU so if one fails (either the power source or the PSU itself) the server still has power from the other. If yours does not, then this wont apply.

If you only see one power cord then yours is single PSU.

You will need to get a bigger UPS if you want more capacity. If you want more run time you can also look at Tripp Lite's inveter-charger units which allow you to connect big batteries such as marine/RV batteries. They are quite nice as while you can do this with regular UPSes, these units are designed for it so it's less likely to cause issues. If you use flooded lead acid (cheapest/most easily available) just keep in mind that they produce hydrogen so you'll want to take some precautions related to that.

My home server setup can remain online for about 4-5 hours if the power goes out. I have two more batteries that I'll be adding to the bank to double that time.

 

[Cerb]

Are you saying some servers has TWO PSU in one box? But if I am only seeing one power cord coming out of the server then pretty sure it only has one PSU, right?

http://www.supermicro.com/products/system/4U/6047/SSG-6047R-E1R72L.cfm
^ 3 PSUs, and that was the first full server I clicked to. Some "redundant" PSUs have a single power connector, but as you can see with your UPS issue, exactly how redundant is that?

Since they're all tiny semi-proprietary 1U units, though, they get loud. Also, they need compatible cases. Most server cases have standard mounts, but in practice, they're proprietary, because there are few makers, and physical arrangement can further narrow down the choices.