hymer BMC 550, Instruction Manual

Page: 118 / 252

8 Electrical system
118
B-MC - 12/18-2 - EHG-0016-01EN
The television (power consumption 36 W) with satellite unit (power con-
sumption 36 W) is in operation every day for 2 hours.

Convert the power data into the required capacity in accordance with the
following formulas:
Power consumption [W] : 12 V = Current [A]
Current [A] x Operating time [h] = Capacity [Ah]
36 W + 36 W = 72 W
72 W : 12 V = 6 A
6 A x 2 h = 12 Ah
The table for a whole day could look like this:
Appliance Power consump-
tion [W]
Current [A] Operating
time [h]
Capacity
[Ah]
Balance of energy
consumption
(example)
Submerged pump 42 3.5 0.1 0.35
Heater 12 1.5 3.0 4.50
Television 36 3.0 2.0 6.00
Satellite unit 36 3.0 2.0 6.00
Refrigerator 2 0.2 24.0 4.00
Lighting (10 LED
lamps à 2 W) 20 1.6 3.0 4.80
Average daily requirement 25.65

Calculate the maximum effective energy with the following formula or
determine it with a special indicator unit:
Current capacity [Ah]: Deep discharge protection = Maximum effective
energy [Ah]
95 Ah : 1.4 (lead battery) = 67.9 Ah

Calculate the maximum operating time in accordance with the following
formula:
Max. effective energy [Ah] : Daily requirement [Ah] = Max. operating
time (in days)
67.9 Ah : 25.65 Ah = 2.65
The current battery capacity would be sufficient for more than two and a half
days if the daily requirement remains the same.
The independent time period can be extended with use of the solar cells.
Two solar cells of 90 W produce the following gain:

Summer: Approx. 60 Ah/day (independent operation reached)

Winter: Approx. 15.5 Ah/day (in order to prolong independent operation,
another living area battery must be installed)
Example:
Example:
Example:
Solar cells