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Renogy BT-2 Bluetooth Module: Pair the controller to the Renogy DC Home App to
monitor your system using a smart device like a cell phone or tablet. Set custom charging
parameters using User Mode and monitor your system in real time.
APS-500 Alternator Regulator
The APS-500 provides control over alternator-based charging by utilizing system voltage, current monitoring
and alternator and battery temperature to ensure safe and powerful charging. The APS-500 Alternator
Regulator is equipped with a multi-color LED which provides a range of operational and advisory codes. The
LED is visible via a waterproof bezel located on near the lower left corner of the label on the regulator’s cover.
WARNING: Turn off switches and disconnect your batteries prior to installing your APS-500 Alternator
Regulator or other electrical system components. Failure to do so may cause damage or injury. Do not
reconnect batteries until wiring is complete, and ensure wires are connected correctly.
There are three modes of information provided:
• Orange (Flashing) = Synced with the battery BMS
• Green = Lost communication with the battery BMS
• Red (Flashing) = Error/Advisory mode
Should the APS-500 determine that a condition is outside of normal limits, it will display a red flashing LED
pattern, followed by a series of flashes indicating the type of fault occurring. Most errors are hard-faults,
indicating a condition which the APS-500 Alternator Regulator is unable to decipher and as such will shut down
until corrected, in order to prevent any potential systems or battery damage. A few errors will attempt to auto-
restart to see if the failing condition clears (example, error low battery voltage). When a fault is detected, the
APS-500 will flash the “Error” code twice, followed by a series of flashes indicating the fault/error number.
Note: the LED will only indicate the most recent fault detected.
Ignore the fast flashes.
Start counting the number of flashes to provide you the first digit of the error code.
There will be a short pause.
Start counting the number of flashes to provide you the second digit of the error code.
In some models, the APS-500 is not easily accessible via an access panel. In these vehicles, a secondary light
has been added.
APS-500 Alternator Regulator Codes
Battery temperature exceeded limit
Battery voltage exceeded upper limit
Battery voltage below lower limit
Alternator temperature exceeded limit
Alternator rpms above expected value
Alternator #2 temperature exceeded limit
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