Answer Posted / claudiu

You can calculate the max time to use a UPS with this
formula

T max = efectiv energi / average power of the energy

that min

T max = 1377 (this is a constant, it's so big because it's
calculate in seconds)* capacity of batery in volts 12V *
capacity of batery in amper's 10Ah or other valu * number
of moduls (number of bateris to use) / how mutch power you
want to consum in W

for exemple

I have 8 baterys with 12V and 10Ah and I want to standup a
computer with 300 W consum

so
1377*8*10*12/300 = 4406.4 seconds that min 4406.4/3600 =
1.2h

sorry for my english

best regards,
Claudiu from ROMANIA

The sours is
http://en.wikipedia.org/wiki/Uninterruptible_power_supply

how much excitation voltage required to generate 1mw power?

2037

---

hello!my name is sheikh iam preparing for indian engineering servieces,please send me the old question papers..to sheikhshaazforjobs@gmail.com

2080

---

what are the 4 rules to start the motor?

2109

---

Why water bubbles when D.C. Current is passed through it? Why not when A.C. Current is passed?

2138

---

EXPLAIN THE TERMS "INTEREST AND DEPRECIATION" AS APPLIED TO ECONOMICS OF POWER GENERATION.

2310

---

Installation resistance for whole installation of 16 kva & 25 KVA DTRA a) Between each conductor b) between conductor to earth c) installation resistance for each apparatus, each conductor to earth d) earth resistance for the system of earthing

1903

---

Dear Sir I am living in Jaipur Rajasthan  now I did complete my b tech degree in electrical engineering in 2012  Sir how I gate certificate of competency for electrical supervisor

1989

---

what the function breaker failure scheme, how is it operated

1903

---

How can we calculate the motor frame sizes?

3404

---

how many types control panel of a 132/33 kv substation

2642

---

What is cut-off rate?

1214

---

hi, could someone help me to find a control design for syncronising panel .

1704

---

How can we measure the residual voltage in dc machines?

1856

---

How to decide whether A / B / C / D curve type MCB should be used?

2282

---

Difference between a pilot wire and a normal conductor?

2044

---