I have now charged the 8 cells of LYP. Did a quick rough balance.
Discharged through the PL60 to measure the Ah that are drawn off. Connected up two spotlight 100W bulbs as the load.

Load as 11A and starting the Ah counter from zero.



With lowest cell down to 3.08v while still under load...
Measured 160Ah out before the internal clock changed to a new day, then measured another 52Ah out. Total Ah out is 212Ah. Not bad from a 400Ah pack that is heading up to 8 years old,used in an EV, and discharged to empty every day on the solar system.
(Edit: thought I should explain why I wrote 400Ah. They are 200Ah cells but I have 2 in parallel making 400Ah 12v pack. Discharge happened with 12v spotlight bulbs.)





The lowest cell voltage jumped up to 3.13v after the load was removed. According to the discharge curve I took out around 85%




Edited 2020-06-02 20:07 by Trev

  Trev said  

Old Seagull Man

The PVE 1200 grid inverters require a 240vac on the output side to get them to switch on. You also need to swap some dip switches inside to make them run from a battery instead of running from a solar array. The PVE 1200 manual explains how to do this.

Thank you, for the info. OSM

Just need to say..........
The LYP cells were snapped up quickly. Sold!
The LFP cells are still here and are a giveaway.

I should have posted here a long time ago ...
The LFP cells have been taken and re-commissioned in another solar system .... they live on!

I was at the place where these LFP cells went to back in April 2023. 16 of the cells were still in operation, 2 parallel, 8 series. 24v solar system. The owner was just here last week and picked up another 8 Winston cells x 200Ah, second hand from a stripped EV conversion. He said the 16 were still operating but with significant reduction in capacity. Remember... history check.... these LFP cells were very much abused in EV Hilux. They are now close on 15 years old. If they were new and used only on a solar system, they would be good for a lot longer.

LFP chemistry is said to be 2000-3000 cycle life.
The new LYP chemistry is said to be 5000+ cycle life.

We have been testing a new active balancer, called Heltec. It is brilliant.

Deligreen is great on smaller series packs like 12v, and does work on the larger 16 cell series strings, but Heltec is quicker and hold balance much better.

  davef said  

I am currently using a Tracer MPPT 20A to charge lead-acid, but it is time to upgrade the battery technology.  One option it to try and modify the Tracer for LiFePo4 use ... if necessary.

Since no one has replied to you yet,

Yes the Tracer can be programmed for Lifepo4, I use an MT50 for parameter changes but you can also use an RS485-USB cable and PC software or the Bluetooth dongle and Epever App.

You could Select the GEL profile, then select USER as a starting point. Turn temp compensation to 0mv, float to 3.35v/cell.