New to Solar but being assisted by an engineer buddy. Having a problem with what I think is a Battle Born BMS system. Trying to use a Battle Born 100AH battery to run a few freezers in my shed. Freezers average around 200 watts (at most). When multiple compressors turn on at once, the wattage spike will reach 750w or 65Amps for a split second. This should not be an issue for a BB 100AH battery connected to a Giandel 2200W Pure Sine Wave Inverter (using 1/0 gauge cables). Here is what has happened multiple times in my attempt to get this going:
When I turn on the inverter, BEFORE plugging in any load, the battery voltage tested by multimeter, and also on the inverter display, reads normally about 13.6v. As soon as I plug in my main freezer (69watts/hr), within 1-3 seconds and even before the compressor kicks on, the inverter gives off a tone and shuts down. I immediately retested the battery's voltage by mutimeter and it typically shows 2.5 - 7.0v after these failures. Sometimes after a few minutes, the battery voltage reading by multimeter returns to normal, showing 13.2-13.6v. Other times I need to use a charger to charge the battery enough to wake-up or reset the BMS. I simplified the test by only plugging in two light bulbs instead of a freezer. You can see that the voltage is 99% to start until I turn on the inverter and immediately it tones off and the voltage on the battery reads 7.0v. From (2) light bulbs totalling 210 watts.
I have attempted to rule out other equipment. I completely disconnected the solar charging side of the setup to strictly test the battery and inverter and it still failed. Originally I had a circuit breaker between the battery and the inverter. To rule that part out, I bypassed the circuit breaker, connecting directly, and the battery still failed, so it's not a bad breaker. All my battery connections are correct and my connections are tight. In order to rule out the inverter, my friend brought over his $250 Alibaba purchased LifeP04 battery w/ BMS (also rated at 100A continuos) and it worked perfectly without any issues. Max amps we saw was about 60-65. His Bluetooth app showed the brief spikes when plugging in the additional freezers and the compressors clicking on and off, but the inverter did not tone- and turn off. The Alibaba purchased battery and 2200 watt inverter ran for our entire half-hour test without any problems. After unplugging my BB battery for that test I tried one more time and it actually handled the load for about an hour before the inverter toned off again reading LO, although the BB still read 13.2v. Is this an overactive BMS ? Previously I had it hooked up and it ran all freezers for about 8 hours.
When I turn on the inverter, BEFORE plugging in any load, the battery voltage tested by multimeter, and also on the inverter display, reads normally about 13.6v. As soon as I plug in my main freezer (69watts/hr), within 1-3 seconds and even before the compressor kicks on, the inverter gives off a tone and shuts down. I immediately retested the battery's voltage by mutimeter and it typically shows 2.5 - 7.0v after these failures. Sometimes after a few minutes, the battery voltage reading by multimeter returns to normal, showing 13.2-13.6v. Other times I need to use a charger to charge the battery enough to wake-up or reset the BMS. I simplified the test by only plugging in two light bulbs instead of a freezer. You can see that the voltage is 99% to start until I turn on the inverter and immediately it tones off and the voltage on the battery reads 7.0v. From (2) light bulbs totalling 210 watts.
I have attempted to rule out other equipment. I completely disconnected the solar charging side of the setup to strictly test the battery and inverter and it still failed. Originally I had a circuit breaker between the battery and the inverter. To rule that part out, I bypassed the circuit breaker, connecting directly, and the battery still failed, so it's not a bad breaker. All my battery connections are correct and my connections are tight. In order to rule out the inverter, my friend brought over his $250 Alibaba purchased LifeP04 battery w/ BMS (also rated at 100A continuos) and it worked perfectly without any issues. Max amps we saw was about 60-65. His Bluetooth app showed the brief spikes when plugging in the additional freezers and the compressors clicking on and off, but the inverter did not tone- and turn off. The Alibaba purchased battery and 2200 watt inverter ran for our entire half-hour test without any problems. After unplugging my BB battery for that test I tried one more time and it actually handled the load for about an hour before the inverter toned off again reading LO, although the BB still read 13.2v. Is this an overactive BMS ? Previously I had it hooked up and it ran all freezers for about 8 hours.