This is a quick presentation of one Line-interactive UPS this made by
Ablerex Taiwan. (Production 2009 and later).
According to Ablerex,
VTPro1500 / 900W this is their advanced technological version in comparison to cheapest 1500VA/ 600W.
The PCB include branded Asian semiconductors mixed with Japanese MOSFET.
Most small electrolytic capacitors are from Luxor.
The UPS has beefy wiring and transformer inside, but it does missing and active cooling fan.
It accepts
2x 12V 9AH battery (24V system).
Over the product sticker, there is in writing that it deliver output at
PF 0.60 (Power factor 0.60)
I take this as indication that the specific factory this is serious, in comparison with Chinese unbranded goods.
Average operating time 30 minutes at 180W load
VTPro1500 includes USB port, and the is also software for it.
Ablerex Taiwan this was invisible to me prior to find this VTPro1500, further research shown that the brand at 2023 this is well networked, EU branch in Italy, USA branch too.
https://www.ablerex.com.tw/products_4.php?bgid=1&mgid=3&sgid=58----------------------------------------------------------------
VTPro1500 How to replace the batteries Due the fact that entire VTPro1500 this has plastic case = several plastic panels forming the case, you need to be careful when dismantle it.
They are two screws at the back (top side), along another two at the front (under the front cover).
How to: Remove all four screws, slide the top cover approximately six centimeter at the back (two inches) push it, then slide and or pull-up the front cover.
Top cover includes the PCB along front LED and the power switch, this should be moved back, so the front cover to be free to moved upwards.
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At my testing VTPro1500 output was 223V on battery
Batteries charger delivers 1A of current.
I am impressed due the electrical build quality!! and I do plan to keep it as spare at my lab.
In a later time with plenty of daylight, I will add some more photographs of it.