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Home > Charge Controller Support > PWM Solar Charge Controller Support > PWM-30-UL > GP-PWM-30-UL Operation: Maximum Power Boost Technology
GP-PWM-30-UL Operation: Maximum Power Boost Technology
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Maximum Power Boost Technology™

Maximum Power Boost Technology™ (MPBT) allows you to override the normal charging algorithm of the solar controller. MPBT is designed to be used before the end of the day, if you know you will require many loads through the night. This feature can also be used when you have just installed the solar controller, to put batteries on a boost charge up to 14.4 VDC (Flooded, AGM and LFP) (14.1 VDC for Sealed/Gel) right away.


To activate, hold the MAX BOOST Button for 3 seconds. As long as there is full sunlight present, your battery voltage will be boosted (to 14.4 VDC for Flooded, AGM and LFP; and 14.1 VDC for SEALED/GEL) for 30 minutes regardless of the battery’s state of charge.


Icons Displayed: BOOST; Battery Symbol


In older controllers, the BOOST text icon will remain on until the controller can maintain a Boost charge voltage for 30 cumulative minutes. In newer controllers, the BOOST text icon will only appear while the controller is maintaining a Boost charge voltage.


IMPORTANT: Do not use the Maximum Power Boost function more than twice a day as it could damage lead acid batteries due to gassing. Sustained high voltages decrease lithium battery lifespan.



If sunlight is insufficient or not available, completing Max Power Boost may take much longer than 30 minutes from the time of the button press. Max Power Boost and the BOOST icon cannot be turned off by pressing the Max BOOST button.

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