Old UPS for light duty inverter/charger

It is 24v, 600W output, full transformer inverter.
I tied to a BYD bank and it runs like a champ.

Hello, I think you're asking for opinions on the idea?
If the unit features a Relay that "clicks" when mains is lost, it's interactive. These inverters are the least expensive ones, they usually feature ugly squared sine wave that will make it 'hum/buzz' depending on the load (usually the BackUPS series from APC fit in this category. SmartUPS are pure sine wave IIRC).
The most important thing is that they're designed to last no more than a few minutes, so they usually lack any cooling solution.
The feasibility of using it as an inverter is high,
1. as long as you either use it for short time spans or if you mod it accordingly to cool it down during operation. (and)
2. you must remove (or apply a mountain of hot glue) over the alarm buzzer. Else it will drive you insane.

regards!

Supervstech said:

It is 24v, 600W output, full transformer inverter.
I tied to a BYD bank and it runs like a champ.

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I have worked with UPS' small 300W to big 20kw for server rooms. Be advised these mostly are designed for Sealed Lead Acid and depending on age / generation possibly other rechargeable. The most recent ones can come with Lithium variants but they are crazy $$. Make sure the charge & maintenance profile of the UPS controller is within spec that your BMS can handle properly. Would hate to see you roast a good battery pack.

Thats one of the old ferresonant UPS, good choice! Efficiency is only around 80% but they'll run forever.

I have stacks of various ups setups...

This one looked good, and was already 24v, the display is awesome, and THERE IS NO ALARM!
IT DOES CHIRP occasionally, but no beeping or whining.

I have another of this brand that's 5KW output 48v input... its bigger than my fridge

I've got 3 of these around the house w/ APC SmartUps one 1000 and two 1500s. The only thing I've noticed is that with running for a extended run time on the batterys the frequency must dip down because the clocks I've got attached to them lose time.

Yes, I have a pair of 2200 smartUPS, and a honking huge smart 3000 rack mount, but it won’t work... I can’t find anything wrong with it, but it isn’t starting up.
I also have a cool Tripp-lite 2200, but it uses 36v batteries... has Anderson port on the back for runtime battery addition...

So I have worked with all types of APC brand by Schneider Electric. Most are square wave that run on 12 volts, 24/48 volt systems some are good sin wave. That being said I have seen these power loads in cabinets when the temp was well in excess of 110 degrees outside. Internal temps through the roof and they just held power. These were for a wireless backhaul backup system that had to keep running because they kept our data AND VOIP running. They had Air-conditioned boxes to keep it cool the rest of the time but when power failed it was do or die and most of our failures were from batteries exploding from being overcharged. Be safe with your battery packs.

Supervstech said:

honking huge smart 3000 rack mount, but it won’t work... I can’t find anything wrong with it, but it isn’t starting up.

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I have an APC 3000XL beast as my upsverter. Sorry if I'm Captain Obvious, but you have to hold the power button for 5 seconds if not connected to grid. And pushing again will silence the beep.

Delmar said:

I have an APC 3000XL beast as my upsverter. Sorry if I'm Captain Obvious, but you have to hold the power button for 5 seconds if not connected to grid. And pushing again will silence the beep.

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I figured that. I have several apc models.
This won't do anything even plugged in.
The ribbon to the front panel was twisted, most likely that is the problem.

Should work great, just check what the output DC voltage is, some like to run a little high... that's why the batteries don't seem to last in those things.

You can buy actual inverter-chargers too and they tend to be better optimized for large batteries but if you already have the UPS it's worth a shot. Might want to add a fan as they arn't designed to run for longer than the little battery inside runs them for.