Airplane Flight Manual
Van’s Aircraft RV-7A
HB-YMT
7 Aeroplane and system description – Page 16
Edition 01.11.2017
Load Analysis:
Alternator
Nippon Denso
55A
Battery
Odyssey
PC-680 / 17Ah
Description
Peak Load
Normal Load
AFCU
0.1
0.1
AOA
0.1
0.1
Audio Panel
0.5
0.5
Autopilot
1.7
1.7
Aux Box
0.1
0.1
Boost Pump
4
4
Cabin Bus
0.2
0.2
Com1
1.3
0.6
Com2/Nav
3.3
0.6
EFIS1
1.3
1.3
EFIS2
1.4
1.4
Field
0.1
0.1
Flarm
0.1
0.1
IGN R
0.1
0.1
Land Lt
7
3.5
Nav Lt
2.1
2.1
Strobe Lt
8
6
Xpdr
1
1
Aux 12V
(Max 10A)
0
Flaps
2
0
MapPC
3
2.7
Starter Ctc
3.6
0
Pitch and Roll Trim
0.2
0
VP200
1.2
1.2
Total
42.4 / (with Aux 52.4)
26.8 (with Aux 36.8)
Total System
Alternator
55 A
Battery
17 Ah
Remark: The aux 12V plug is safetied by a 10A fuse and is intended to hook up additional units. In reality,
consumption will be zero or near zero.
Conclusion: The capacity of the alternator is sufficient to support the complete system.
There are 2 backup circuits with switches in the case that the complete
VP200 would be malfunctioning. One for the Boost Pump, one for the P-
Mag external power, both directly attached to the battery and fused by
automotive style blade fuses.
