Recent content by aclosson

I will do some more testing and report back. Thanks everyone for your input. Art

Using a capacitor is an interesting idea, along the same lines as a soft start on an RV AC unit. Thanks, Art

Thanks for help, I will do some experiments with jumper cables to see if this makes a difference. My microwave is a small one in my camper which likely is why I am only measuring 91 amps. I did see a post from Overkill that paralleling BMS was not supported for what it is worth.

About 8' each cable. Upgrading to 4/0 would be challenge just on the physical side. Just for clarification, are you using the same BMS or something else?

What size would you recommend? This is same wire has been working with a lead acid battery for over 6 years but obviously no lithium and no BMS.

The inverter is drawing 91 amps continuous when set at 100% power. The BMS is rated at 120A and I just checked and there are (4) 8awg (which is theoretically good for 180 amps) not 10awg wires as I incorrectly stated earlier. I think we all agree that the microwave it too large a load for this...

The BMS came with (4) 10awg cables for each side factory crimped. One side of the BMS runs to the battery negative and the other to the shunt. The inverter positive cable runs directly to the battery with a 2awg factory crimp and the inverter negative runs to the shunt, also with a 2awg cable...

DJ: Do you see any problem having the shunt between the battery and BMS? This was something that I was thinking was not a good idea based on the small voltage drop across the shunt which would potentially impact the BMS reading of the last cell. Any and all input is welcome. Thanks, Art

Thank you everyone for all of your help. I wound up ordering an 5a to 8a active balancer to compensate for my poorly matched cells based on a recommendation from the Freely Roaming YouTube channel which can be found here. This definitely solved the problem and I now can use the Renogy DCC50S...

Bob, that is a good point but I did a full re-wire as part of this this project and I have verified good voltages at all points including the input to the inverter. Voltage drop under high load is very small which makes me think that this is an inrush issue.

I recently upgraded my camper to 280ah raw cell lithium batteries with an Overkill BMS. Everything is working great except for when I start my microwave, the BMS reboots, dropping the load in the process which resets everything in the camper including my Ali SOC shunt battery status. When I look...

Once I start discharging the cells they quickly equalize with only .02V of difference. I am going to go through a few cycles on a camping trip next week and I will watch this closely but my guess is that I am going to need to add an active cell balancer. If nothing else it will be an...

Unfortunately the Renology charger does not give you the option to change the charge voltage other than changing the battery type. The full pack over voltage is currently set at 14.6V.

After doing a top balance I assembled my 280AH grade B batteries with an Overkill 120A BMS which is being charged by a Renogy DCC50S 50A DC to DC MPPT charger. The charger is set for Lithium batteries but when being charged, one of the batteries exceeds the over voltage threshold and the BMS...

Thanks for the suggestions, I will do both now. Art