Inverter battery question

[Terence1983]

I have an old Dynex 1450va 24v pure sinewave inverter running off 2 deltec 1250 high cycle batteries. The batteries were purchased in Feb 2019 as per the date on the batteries so they are a bit old already, floating charge is 27.4v according to the screen on the inverter. This setup was purchased 2nd hand last year. Prev owner said the batteries dropped below 50% twice while he had it, dont know how true that is.

i have a smart plug connected from the inverter to monitor the load:

https://www.futurama.co.za/catalog/...ect-smart-tech-plug-16a-sa-3-pin-power-meter/

Im not sure how accurate this thing is. When we have load shedding with just my nokia fibre router and laptop and 2nd screen, it shows im pulling less than 100w of power however my batteries dont last more than 2 and half to 3 hours max at that load, i put it off when battery voltage drops to 24.something v to save the batteries, it has dipped below 50% twice since ive had the setup and as soon as the warning beep went off, i put the inverter off. If i have the router and skyworth 55 inch tv (should pull 150w according to specs) and one 5w led light, the batteries only last 1.5-2 hours before it starts beeping its 50% warning

On 100w-250w, should the batteries not last way longer than they are. Or do you think the batteries are already failing?

 

[Mzezman]

Sounds like they are on their way out (batteries)

 

[DuracellBunny]

Yep batteries on the way out.

 

[wingnut771]

Time to go lithium and maybe drop down to 12V inverter so you don't have to worry about 2 batteries.

 

[Terence1983]

Thanks guys, yea time to look at lithium

 

[Lupus]

Dropping below 50% is already not a good thing, doing it twice is messing them up more.