New LFP House Battery

Apr 22, 2011
944
Hunter 27 Pecan Grove, Oriental, NC
Greg, I would go through the pages of both battery apps and see if there are any settings that are not the same. If that checks out, I would cycle each setting key on the misbehaving app.
 
Jan 7, 2011
5,661
Oday 322 East Chicago, IN
Greg, I would go through the pages of both battery apps and see if there are any settings that are not the same. If that checks out, I would cycle each setting key on the misbehaving app.
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 :facepalm:

Greg
 
Jul 23, 2009
916
Beneteau 31 Oceanis Grand Lake, Oklahoma
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.
 

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Jan 7, 2011
5,661
Oday 322 East Chicago, IN
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). :thumbup:

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.

IMG_4496.png IMG_4495.png


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
 
Jun 17, 2022
259
Hunter 380 Comox BC
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). :thumbup:

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
All correct !

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....