I explain in the video that I am trying to drain these two batteries banked together. I just don’t seem to have enough wattage available to use to drain these batteries.
FYI, voltage is not a good way to determine the SOC of lithium batteries, a 0.2V difference can vastly change the state of charge (70-30%) and testing voltage under load gives false readings, you should look into installing a cheap shunt to ensure you know the actual SOC. Also, it should only take approximately 3.2 hours to completely drain the 200 amp hours (2400 watt hours) if you maxed out the 750 watt inverter.
I actually just read up on that information two nights ago in the book I'm reading. Would have been useful info before. But I have a good shunt on order now.
look into a cell balancer. i know the BMS is supposed to do that but ive found a dedicated balancer to work much better at actually balancing the cells. also most atleast all the ones ive seen have a discharge feature
The inverter will hit its own low-voltage drop-out before the battery cuts out. So one simple solution is to just connect up a PTC space heater of the appropriate voltage rating directly to the battery. Roughly 300W, and each of those batteries is 12.8V * 100Ah = 1280 Wh, so two batteries makes 2560Wh. 2560Wh / 300W = 8.5 hours to fully drain the batteries from full with a 300W PTC heater. With lithium batteries, particularly because people are working with different voltages, it is better to just consider capacity based on watt-hours of storage and not amp-hours. Watt-hours = amp-hours x voltage, roughly.
Nope, I can do the math so their capacity is completely predictable. Sounds like you done some reading but still don't fully understand. And don't worry most don't either.
I'm still in the learning phase, indeed. I know the math. I think the point of the video was to demonstrate just how much these things can take before they are juiced out.
Very nice.
FYI, voltage is not a good way to determine the SOC of lithium batteries, a 0.2V difference can vastly change the state of charge (70-30%) and testing voltage under load gives false readings, you should look into installing a cheap shunt to ensure you know the actual SOC. Also, it should only take approximately 3.2 hours to completely drain the 200 amp hours (2400 watt hours) if you maxed out the 750 watt inverter.
I actually just read up on that information two nights ago in the book I'm reading. Would have been useful info before. But I have a good shunt on order now.
look into a cell balancer. i know the BMS is supposed to do that but ive found a dedicated balancer to work much better at actually balancing the cells. also most atleast all the ones ive seen have a discharge feature
These batteries self-balance after being connected for 24 hours.
The inverter will hit its own low-voltage drop-out before the battery cuts out. So one simple solution is to just connect up a PTC space heater of the appropriate voltage rating directly to the battery. Roughly 300W, and each of those batteries is 12.8V * 100Ah = 1280 Wh, so two batteries makes 2560Wh. 2560Wh / 300W = 8.5 hours to fully drain the batteries from full with a 300W PTC heater.
With lithium batteries, particularly because people are working with different voltages, it is better to just consider capacity based on watt-hours of storage and not amp-hours. Watt-hours = amp-hours x voltage, roughly.
Most everything I own is in boxes, in some kind of storage. I had a tough time finding anything I could plug in. I really appreciate the info.
Please get a better inverter.
I have 110 2000w inverter. The one I was using for this experiment was a 750w and is my spare.
Nope, I can do the math so their capacity is completely predictable. Sounds like you done some reading but still don't fully understand. And don't worry most don't either.
I'm still in the learning phase, indeed. I know the math. I think the point of the video was to demonstrate just how much these things can take before they are juiced out.