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-vol... 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-charge... 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 _______________________________________________ NANOG mailing list
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