Hey newbostonconst, what size did you order, 280ah or 105ah? Glad to here they looked good and tested close for voltage. Looking forward to hearing your experience with capacity tests. If you have the 280ah cells is there anything on them or with the paper work that specifies them as grade A?
I doesn't matter to me as long as they have the capacity and are reasonably close in internal resistance. At less than $125 per kWh they are a good value. I am going to treat them conservatively.
I'm very happy with my 8-280ah LiFePo4 batteries. I top balanced them at 3.6 volts and I'm within 10 mV. I have not discharged them all the way yet but so far at 25% discharge, I'm still within 10 mV. The internal resistance on all of my cells was 0.13-0.14 ohms. I finished building up my pack today and still testing with my inverter and solar charge controller. Setting my Absorption voltage at 28.4V (3.55V cell) and Float at 27.0V (3.375V cell) on both inverter/charger and SCC. Inverter low voltage warning at 24V (3.0V cell), cutoff at 23V (2.875 V cell) and I have set my Chargery BMS at a High Voltage cutoff of 29.2V (3.65V cell) and Low Voltage cutoff at 2.8 V per cell. I made my own busbars from 0.1875" x 1" copper bar stock. Building a movable (although heavy) setup using a Harbor Freight 18" x 30" wood dolly as the base and 3/4" plywood for my box. Approximate weight of the entire system estimated at 200 lbs. Amy told me when I was ordering the batteries that they were brand new Grade A cells, and I believe her. The terminals were spotless.
That's interesting.
I'm planning to install it to run some essential home loads with off-grid solar, but I wanted to put it on wheels so I could move it around for increased flexibility if necessary in an emergency. Due to its weight, it probably won't be moved all that often, but its on wheels just in case.
280 I questioned if they were grade A and they said yes....haha...highly technical method.
I placed mine on 4/20.
I looked a while ago and for some market reason the 280s seem to be the commodity leader then. I would have preferred 64 150 Ah batteries to the 32 280s that I purchased, but I didn't find any from sellers with inventory and a track record on this forum. Subsequent to my order, I think I recall, @fhorst found some.
Looking like we All had product on the same ship!
Received two 6/9, two 6/10, four 6/11. All look great, have capacity tested first four at 280.1 - 283.0 Ah. Had hoped for a little extra margin but can't complain about exactly meeting spec!
Thanks for the update; looking forward to your experience .... sort of weird that the bolt won't seat all the way.
Which BMS are you using?
