Deploying OutBack Power Equipment with Lithium Batteries

Application Note

Caveats

• High-Voltage batteries are not compatible with currently available OutBack equipment.

Use only batteries with a nominal voltage of 24 or 48 Vdc.

• Under certain conditions, the in-rush current of a Radian can be up to 1,000 amperes.

This exceeds the limit for short term discharge of many batteries. In this case, a

pre-charge circuit that charges the inverter capacitors before shutting the battery breaker

is recommended.

• The operating temperature range for lithium batteries is typically narrower than that of

lead-acid batteries. If replacing a lead-acid battery bank with lithium, ensure the

environment is within the new acceptable temperature band.

Equipment Compatibility

Inverters

SkyBox: All versions compatible

Radian 8048A/4048A: All versions compatible

Radian 7048E/3048E: Firmware versions 001.005.003 and higher are compatible

Radian 8048/4048: Not compatible

FXR series: All versions compatible

GTFX/GVFX/GFX series: Not compatible

M-series: Not compatible

Charge Controllers

FM Series: All versions compatible

MX Series: Not compatible

Float charging cannot be disabled on charge controllers. When alone in a system (no inverter) the

charge controllers enter a ‘silent’ state between the end of the absorb stage and the beginning of the float

stage.

Setting the float voltage to just above the re-bulk voltage will maximize this time.