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muwlgrIn my past records (https://muwlgr.dreamwidth.org/50292.html), I noted that car batteries attached in parallel to my UPS internal batteries (after I drilled necessary openings to connect them) could greatly increase battery run-time of said UPS.
But after my first test with its impressive 19h+ runtime, I have got a great disappointment.
First of all, the charge my UPS was able to deliver to my upgraded(parallelized) battery setup in >17h, was able to sustain its discharge only for <4.5h on the next power outage (discharge cycle).
And on the next power cycles, it took 1h, 45m, and now it takes down of 45m on every test, that is 4.5A*h or 108 W*h at 24V.
On the local market I purchased an UPS model working from external lead-acid batteries, 2 of them, serial, 12V of each, called SVC SL-1KL .
Its specified charge current was 10A, that is, about 1/6 of its C (capacity in A*h)
I moved my car batteries from my APC SmartUPS 1000 to this SVC UPS, and plugged it into the AC socket first, and APC into its output.
And this 45min runtime was exactly what I have achieved with this setup and multiple charge-discharge cycles.
By watt-meter reading on the input and output of the SVC UPS, I concluded that it uses about 30..35W for its own purposes when feeding from AC utility socket (<75W output and ~105W average input).
Working from batteries, it draws about 6A at 24V, that is 144W, with the same <75W on its output, which means its inverter efficiency is around 50% which I did not like at all.
And when charging the fully-discharged batteries, the current does not reach even 6A (about 5.6..5.7A initially). In less than 2 hours, it drops to 0.24A, that is, "floating charge".
The current to/from batteries I measured with a simple clamping meter from AliExpress.
Currently I have ordered a "Battery Rejuvenator BR 12-72 600" from Aliexpress and am waiting for its delivery.
It is said to dissolve PbSO4 using high-frequency electric impulses.
There is even an experimental paper from some Nigerian guys showing that it really has its stated effect on a battery pack.
At the same time, I have received solar panels for my roof and am waiting for delivery of a solar inverter to improve my electric autonomy, as power outages in our area are going to get even worse in fall&winter.
But after my first test with its impressive 19h+ runtime, I have got a great disappointment.
First of all, the charge my UPS was able to deliver to my upgraded(parallelized) battery setup in >17h, was able to sustain its discharge only for <4.5h on the next power outage (discharge cycle).
And on the next power cycles, it took 1h, 45m, and now it takes down of 45m on every test, that is 4.5A*h or 108 W*h at 24V.
On the local market I purchased an UPS model working from external lead-acid batteries, 2 of them, serial, 12V of each, called SVC SL-1KL .
Its specified charge current was 10A, that is, about 1/6 of its C (capacity in A*h)
I moved my car batteries from my APC SmartUPS 1000 to this SVC UPS, and plugged it into the AC socket first, and APC into its output.
And this 45min runtime was exactly what I have achieved with this setup and multiple charge-discharge cycles.
By watt-meter reading on the input and output of the SVC UPS, I concluded that it uses about 30..35W for its own purposes when feeding from AC utility socket (<75W output and ~105W average input).
Working from batteries, it draws about 6A at 24V, that is 144W, with the same <75W on its output, which means its inverter efficiency is around 50% which I did not like at all.
And when charging the fully-discharged batteries, the current does not reach even 6A (about 5.6..5.7A initially). In less than 2 hours, it drops to 0.24A, that is, "floating charge".
The current to/from batteries I measured with a simple clamping meter from AliExpress.
Currently I have ordered a "Battery Rejuvenator BR 12-72 600" from Aliexpress and am waiting for its delivery.
It is said to dissolve PbSO4 using high-frequency electric impulses.
There is even an experimental paper from some Nigerian guys showing that it really has its stated effect on a battery pack.
At the same time, I have received solar panels for my roof and am waiting for delivery of a solar inverter to improve my electric autonomy, as power outages in our area are going to get even worse in fall&winter.
