After having run a test on my new CyberPower CP1300PFCLCD using a 400 W load (half of what the UPS is rated for), I have decided to hack the UPS to include an external battery connection option at the back since the UPS is supposed to run for around 10 minutes at that power draw from its internal batteries as mentioned on their website but only got 3 minutes on a fully charged pack of fresh batteries and got very frustrated as that was the main reason I went for this UPS.
The mod has already been done and was tested at the same load of 400 W and lasted an hour on two small car batteries.
That being said, I realized i might have a small problem or maybe not.
I will only ever need to run such a load for 10 minutes so I will have to buy two 12V batteries with a capacity of around 45 AH an wire them in series since the UPS works in a 24 V configuration.
At 400W, the UPS is drawing 22 A from the batteries and since I would like to make the most use of the power, I thought that at 800W of load, around 45A will be drawn so a minimum of 45 AH battery is what I need.
Second problem is charging the battery pack. The UPS can only provide about 0.5A of charging current so that would mean in case I fully discharge the 45AH battery pack, It would need about 4 days to get them fully charged again!
Could I then just use a more powerful charger in parallel to the batteries while connected to the UPS or will having two chargers working simultaneously be damaging to the batteries?
Lastly, I tried running the UPS on a DC power supply of 24V and the UPS would not cold boot. Tried connecting it in parallel with the battery pack and later on disconnected the batteries and the UPS would still shut down.
Why is this happening? The power supply is a 1500 W mean well unit so it's definitely not a power issue.
Home
Help
Search
Login
Register
