Outback Power Systems FLEXpower ONE One Fully Pre-Wired Single Inverter System Installation Manual - Manual (Page 17)

Planning
900-0095-01-00 Rev A
15
PV Array Planning
The FLEXpower ONE is designed to use PV input to charge the battery bank. The FLEXmax 80 charge
controller(s) integrated into the FLEXpower ONE System uses Maximum Power Point Tracking (MPPT)
technology to maximize the PV harvest. A PV Combiner box (not included) may be required for
multiple PV strings. PV Combiner Boxes are available from OutBack Power Systems for 8 to 12
PV strings.
FLEXpower ONE includes one FLEXmax 80 Charge Controller. The charge controller allows input from
a single PV array. The PV input can support the following PV configuration.
 4,000 W
STC
on 48 Vdc system, 2,000 W
STC
on 24 Vdc system
 150 V
OC
including local temperature correction factor per NEC 690.7
 64 A I
SC
maximum PV array current per NEC 690.8
For a PV Planning Tool, see the following website.
http://outbackpower.com/resources/string_sizing_tool/
Battery Bank Planning
Types of Batteries
 The FLEXpower ONE System supports a 24 or 48 Vdc battery bank, depending on the inverter that
is featured in the configuration. Before constructing a battery bank, check the model number on
the side of the inverter to confirm the nominal battery voltage.
 A vented enclosure for the battery bank may be required by electric code.
Bank Sizing
In general, the size of the loads (watts) and the required backup period (hours) will determine best size
for the battery bank. To calculate this, use the information provided on page 53 through page 57.
Worksheets are provided for assistance.