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I have the following parameters. Now I want to calculate the VAh for he online UPS.

Input:
Input Voltage Range (Load < 50%): 118 ~ 295 V (± 5 V)
Input Voltage range ((Load > 50%)): 160 ~ 295 V (± 5 V)
Frequency: 40 ~ 70 Hz
Power Factor ≥ 0.99 @ full load

Battery
DC Voltage 72 V (6* 7.0 Ah battery inside)
Charge current 1.5 amps
UPS Overload / UPS Short-Circuit 110% / 300%

Output
Voltage Range 208 / 220 / 230 / 240 V AC
Frequency Range (Synchronized Range) 47 ~ 53 Hz or 57 ~ 63 Hz

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    \$\begingroup\$ Where are you stuck? \$\endgroup\$
    – Transistor
    Commented Sep 29, 2020 at 6:00
  • \$\begingroup\$ don't know how to do it pls help \$\endgroup\$
    – Deepak Jain
    Commented Sep 29, 2020 at 6:50
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    \$\begingroup\$ Is this a homework question? Why are you trying to calculate the VAh? What VAh are you trying to calculate? The load or the battery? \$\endgroup\$
    – Transistor
    Commented Sep 29, 2020 at 8:14
  • \$\begingroup\$ both @Transistor \$\endgroup\$
    – Deepak Jain
    Commented Sep 29, 2020 at 8:37
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    \$\begingroup\$ Sorry, if you don't answer all the questions I can't help. Read the comments carefully and try to answer each point. \$\endgroup\$
    – Transistor
    Commented Sep 29, 2020 at 8:49

1 Answer 1

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Usually, VAh is calculated for the battery. VAh is a battery parameter.

Here, overall battery pack voltage = 72 V (the entire battery pack, which, according to your question comprises six 12V batteries). Since the batteries are in series, remains the same = 7 Ah (Ah is similar to current (A) in series configuration).

Hence VAh = 72 x 7 = 504 VAh

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