[NANOG] Re: Small Capacity UPS

[John Fraizer via NANOG <nanog () lists nanog org>]

One thing to think about when designing a UPS solution (constant on type)
is that your AC->DC supply must be able to carry your max load + the max
charge load.  Think about instances where you’re running on batteries for a
sufficient period that your charge current drain may be equal to your
actual steady-state load.

--
John Fraizer
LinkedIn profile: http://www.linkedin.com/in/johnfraizer/




On Tue, Apr 8, 2025 at 2:29 PM Dylan Ambauen via NANOG <
nanog () lists nanog org> wrote:

> On Tue, Apr 8, 2025 at 6:06 AM Dave Phelps via NANOG <
> nanog () lists nanog org>
> wrote:
>
> > If you don't mind building you own UPS from COTS parts, you may want to
> > look at Xantrex (https://xantrex.com/). I have one of their UPS units
> (the
> > FREEDOM XC PRO 2000) in an RV with 2 100AH LiFePo4 batteries in parallel.
>
>
>
> Yes, an integrated (inverter + charger + power supply) connected to
> batteries is the simplest, most compact, plug and play.
> Another example product:
>
> https://www.aimscorp.net/product/2000-watt-pure-sine-inverter-charger-24-volt/
> Options exist to additionally combine solar MPPT inputs.
> Sealed Lead Acid AGM 12v 100Ah batteries still work, I don't rule them out.
>
> If you can avoid converting to AC, then you avoid the inefficiency of an
> inverter running with undersized loads. You need an integrated (charger +
> power supply), Iota is very good.
>
> https://www.iotaengineering.com/products/dls-power-converters-battery-chargers
> Call Iota and speak with an engineer to correctly size the
> charger/batteries and 12/24/48v, I learned a lot in 5 minutes.
> A power supply+charger can charge the battery all the way up, drop to a
> maintenance voltage, and still source all the current to feed your gear
> without overcharging the battery, similar to an alternator in a car. The
> power supply must have capacity to source enough current at maintenance
> voltage.
>
> A device like this can replace AC power supplies for ATX boards:
> https://www.mini-box.com/DC-DC
> Here is an excellent 1 port POE Injector with 12v UPS, connect a battery of
> your choice and enjoy: https://mikrotik.com/product/mups
> Consider using a battery balancer for arrays with many batteries.
> https://www.victronenergy.com/batteries/battery-balancer
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