| How
to calculate the type of battery you need! |
| Applications |
Power
(P)
|
Voltage
(V) |
Current
I=P/V |
Hours of functioning |
Capacity
Ah |
| Caravans 1 x 40W Bulbs |
40W |
12V |
3.3A |
4h |
13.2
Ah |
| Portable T.V. |
50W |
12V |
4.2V |
4h |
16.8
Ah |
If used together : Capacity required = (13.2 + 16.8)
x 1.25* = 37.5 Ah used type RR0
The 40 Ah battery should be selected. |
| Lighting 2 x 40W Bulbs |
80W |
12V |
6.7A |
6h |
|
| Capacity
required = 40.2 x 1.25* = 50.25 Ah use type RR2 |
Total |
40.2
Ah |
| Portable Television |
50W |
12V |
4.2A |
4H |
|
| Capacity
required = 16.8 x 1.25* = 21 Ah use type RR0 |
Total |
16.8Ah |
| Boating Refrigerator |
60W |
12V |
5A |
8h |
40
Ah |
| V.H.F. Radio |
1W |
12V |
0.08A |
5h |
0.4
Ah |
| G.P.S. Navigation System |
8W |
12V |
0.7 |
3h |
2.1
Ah |
| Auto Pilot |
24W |
12V |
2.0A |
5h |
10.0
Ah |
| If
used together : Capacity required = 40 + 0.4 = 2.1 + 10 = 52.5
x 1.25 = 65.63 Ah use type RR2 |
Total |
52.5 Ah |
| *
The security factor is used for : Incomplete
Charging and protecting against Over Discharge |
