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Matt Dralle Email List Administrator
Submitted By: wschertz@ispwest.com Email List: Aeroelectric-List Name: William Schertz
Date: Apr 12 2005
Subject: One Alternator -- two Battery architecture Description: I am installing an all electric system, with an automotive conversion that will not have magnetos. I am also using the Blue Mountain EFIS, which I have found out from the Aeroelectric list, will brown out if not accomodated with a voltage source that does not sag when operating the starter (non DO-160 compliant).
I cannot physically get two alternators in my installation, therefore I am planning a single alternator, dual 17 A-hr battery system.
In the attached drawing, which is an attempt to build off of Fig. 7-14 in the 'connection, there are two 2-10 switches to operate the system. SW-1 acts as main battery master. When in 'down' position, everything is off, when in middle position, the main battery contactor is activated, and power flows via the diode to the 'essential bus' which powers the EFIS, Electronic ignition, and one (of two) fuel pumps. When in the 'up' position, is also connected to the 'essential bus directly from the AUX battery. In the 'up' position, when you activate that starter, the voltage on the E buss should not sag, as it is isolated from the main battery by the diode. After the engine starts, SW-1 is moved back to the middle position.
With engine running, SW-2 is moved from 'down' (off) to 'up' and the AUX battery is now on-line to receive charge. The E-bus is getting fed through the diode from the main battery, and from the AUX battery directly.
Scenario -- Alternator fails
Low Volt light comes on, SW-2 is moved to middle position to isolate AUX battery from system and power E-bus directly. SW-1 is turned off to conserve battery power, if necessary, SW-3 can be turned on if AUX battery begins to be depleted. Moving SW-1 on to middle position can be done near landing to power extra items.
Comments welcome and desired.
Bill Schertz
KIS Cruiser # 4045
File: E-Bus_11.PDF E-Bus_11.PDF
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