4
Series/Parallel Wiring
continued
Daisy chain wiring
A wiring scheme in which multiple devices are wired togeth-
er in sequence. All interconnecting wiring should be of same
length to minimize voltage drop.
Disavantages:
• The interunit cables are required to increase in gauge
size to accommodate the increase in current of each
connected string.
• Maintenance and battery diagnostics require the entire
battery system to be disconnected from the renewable
energy system, leaving no back up energy source.
• Wiring connection assessment difficult to follow with
multiple wirings connected to same battery terminal,
increasing chance of re-connection wiring errors.
Common bus wiring
A wiring scheme in which same polarity terminals are con-
nected to a single termination point. All interconnecting
wiring should be of same length to minimize voltage drop.
Advantages:
• Cables can be of same gauge.
• Maintenance and battery diagnostics can be performed
on a single string while maintaining a level of back up
energy source from the other strings staying connected
to the renewable energy system.
• Wiring connection assessment simplified by single point
cabling reducing re-connection wiring errors.
