NAS + UPS + Solar Battery

[Enquiries]

Hello Nascompares,
The background for this is I have DS920+ NAS and am waiting for a Expansion box
to be delivered with some more hard drives for me to upgrade the nas ad to use the expansion box. So my UPS will be powering the NAS and Expansion box. Here in Australia
I have solar panels and just had a solar battery installed recently.
I have the ups currently setup to shut down on power outage after 5 or 10mins. But now with the solar battery supporting the house in event of power outage. But their being a 30sec to 2mins lets say time when the nas will be using the ups.

What is the best way to set this up to work well with the ups and solar battery?
Would I be best to manually shut down the device once I am on the solar battery?
If I was not home and this happened how should I have it setup?
Thanks for any advice.
Chris

[ed]

Since your solar battery keeps the house powered once it takes over, what matters most is the behaviour during that thirty second to two minute window before the battery picks up the load. Your current UPS shutdown timer of five to ten minutes is fine, but you can tune it a bit so the NAS does not shut down unnecessarily.

Here is the cleanest setup.
Keep the UPS in USB mode so the DS920 plus receives status directly.
Set the UPS to shut down the NAS only when the UPS itself is about to run out of power, not after a fixed delay. Most models allow you to change this from a timed shutdown to a low battery threshold. This way short outages never trigger a shutdown, because the UPS still has plenty of charge while the battery system kicks in.
If your UPS does not support low battery threshold control, change the delay to something longer, for example fifteen to twenty minutes. The house battery will stabilise power long before that, so the NAS will not shut down unless you lose both grid and battery.

If you are not home, this is the safest behaviour. The UPS covers the gap. The solar battery then takes over and the NAS keeps running without interruption. Only a true multi hour outage would drain the UPS and trigger a clean shutdown.

There is no need to manually shut down the NAS when the home switches to solar battery. The whole point of the UPS is to make these transitions smooth.

If you want, you can also set the NAS to auto power on once regular power is restored, but if the system is stable on the home battery this may not matter.