Why Won't MaxxFan Deluxe 7500K Roof Vent Work with Lithium Batteries

Question:

Ive recently switched from lead-acid AGM batteries to LiFePo4 batteries on my travel trailer. My MaxxFan Deluxe 7500K will not power up and now beeps and flashes green on the keypad continually. The unit works fine when I switch back to a fully charged lead-acid AGM battery. Any assistance is greatly appreciated. Thank you,

asked by: Randall P

Expert Reply:

The older MaxxFan 7500K circuit boards aren't able to handle the higher voltage of lithium batteries which is why you are having the problem you have. So what you would need is a new circuit board with part number # MA10A21275K as the new version can work with lithium batteries.

expert reply by: Jameson C