TrailManor Owner's Forum - View Single Post - over-paneling an MPPT controller.

**rickst29** · 08-22-2023, 03:57 PM

Thanks for your comment! My wiring will be 3S-2P, with about 64 volts V-disconnected (PWM mode). With my "solar power into MPPT using the bargman" trick, I have already run the BN-3215 at maximum output current for extended periods.

Your 1500w was a lot closer to the "3x" max rating for s single controller, which could theoretically put out only about 545 watts as 13.6 volts with 40A current. (higher power or lower voltage than I have could have reach your 40A limit, causing MPPT "issues under" great sunlight into only one controller). My 800 watts into a single smaller one is only slightly worse than than your "two controller" configuration.

08-22-2023, 03:57 PM	#3
rickst29 yes, they hunt lions. Join Date: Aug 2005 Location: Reno, NV Posts: 1,324	Thanks for your comment! My wiring will be 3S-2P, with about 64 volts V-disconnected (PWM mode). With my "solar power into MPPT using the bargman" trick, I have already run the BN-3215 at maximum output current for extended periods. Your 1500w was a lot closer to the "3x" max rating for s single controller, which could theoretically put out only about 545 watts as 13.6 volts with 40A current. (higher power or lower voltage than I have could have reach your 40A limit, causing MPPT "issues under" great sunlight into only one controller). My 800 watts into a single smaller one is only slightly worse than than your "two controller" configuration. __________________ TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor). TV = 2007 4runner sport, with a 36 volt "power boost".