New LFP House Battery
- Thread starter SycloneDriver
- Start date
Thanks. There aren’t too many settings to mess with in the Humseink BMS app.
I separated the batteries today and am charging the batteries independently tonight, and see if they can both be brought to the same voltage. if so, I will wire them back in parallel and see if they stay pretty much equalized when in use.
I love the fact that I can see what the batteries are doing, but it might drive me crazy micro-managing them
Greg
I got back to my boat today. Over a week ago I adjusted the float voltage on the charger up from 13.2 to 13.4. The battery is now resting at 93% SOC instead of 66% at 13.2v. I'm reasonably happy with that.
I still need to add a fuse and strap it down. I did add a protective cap on the positive terminal bolt. The straps I bought are too short.
I still need to add a fuse and strap it down. I did add a protective cap on the positive terminal bolt. The straps I bought are too short.
Attachments
An update on my new LFP battery bank…
I had communicated with the mfg (Humsienk) and they asked me to independently charge each battery using a 14.6 v and 5 amp charge, and to leave it on the charger for a couple of hours. I did each one, somewhat unsure of what good it would do since the batteries shut off their CHG switch once they are at 100% SOC.
But I did as instructed.
I reinstalled the batteries yesterday and left them charging over night (fridge and a few other things are on, so there is always a small load on the batteries).
Got to the boat this morning, batteries were within .1 volt of each other, and both were discharging (sharing the load).
I took the boat out for a 3 hour sail, leaving fridge and other electronics on, including using the AP a bit. I was very happy to see that both batteries were at same voltage, both discharging and sharing the load! When I got back to the dock, and before turning on the new Victron charger, Voltage and SOC were identical on both batteries. This is what I was expecting to see.
If I were to do it again, I might opt for a single 200 or 300 Ah battery to avoid the paralleling issues, but if these now are “equalized” and stay close to each other, I will be very happy.
Greg
I had communicated with the mfg (Humsienk) and they asked me to independently charge each battery using a 14.6 v and 5 amp charge, and to leave it on the charger for a couple of hours. I did each one, somewhat unsure of what good it would do since the batteries shut off their CHG switch once they are at 100% SOC.
But I did as instructed.
I reinstalled the batteries yesterday and left them charging over night (fridge and a few other things are on, so there is always a small load on the batteries).
Got to the boat this morning, batteries were within .1 volt of each other, and both were discharging (sharing the load).
I took the boat out for a 3 hour sail, leaving fridge and other electronics on, including using the AP a bit. I was very happy to see that both batteries were at same voltage, both discharging and sharing the load! When I got back to the dock, and before turning on the new Victron charger, Voltage and SOC were identical on both batteries. This is what I was expecting to see.
If I were to do it again, I might opt for a single 200 or 300 Ah battery to avoid the paralleling issues, but if these now are “equalized” and stay close to each other, I will be very happy.
Greg
All correct !An update on my new LFP battery bank…
I had communicated with the mfg (Humsienk) and they asked me to independently charge each battery using a 14.6 v and 5 amp charge, and to leave it on the charger for a couple of hours. I did each one, somewhat unsure of what good it would do since the batteries shut off their CHG switch once they are at 100% SOC.
But I did as instructed.
I reinstalled the batteries yesterday and left them charging over night (fridge and a few other things are on, so there is always a small load on the batteries).
Got to the boat this morning, batteries were within .1 volt of each other, and both were discharging (sharing the load).
I took the boat out for a 3 hour sail, leaving fridge and other electronics on, including using the AP a bit. I was very happy to see that both batteries were at same voltage, both discharging and sharing the load! When I got back to the dock, and before turning on the new Victron charger, Voltage and SOC were identical on both batteries. This is what I was expecting to see.
View attachment 233372 View attachment 233373
If I were to do it again, I might opt for a single 200 or 300 Ah battery to avoid the paralleling issues, but if these now are “equalized” and stay close to each other, I will be very happy.
Greg
Lithium wired in parallel must all have the same state of charge before wiring them together... Ideally cycled once or twice as well.
Recheck individual cell balance every 6 months or more based on usage and separate, recharge and then recombine...
Lithium does not mean maintenance free....
