#151863  by Nut17
 Sat Jun 01, 2019 8:36 am
I suspect that there is an auto - bid by "john112". They have to be worth $1000 - $1500 ? Based on the reasoning that discharge cycles, rather than age is the main contributor to the eventual loss of capacity. I was going to be a serious contender Neville, but wont get into a bidding war with you. ;)
 #151864  by scubadoo
 Sat Jun 01, 2019 8:55 am
I am not a serious bidder Chris but would not like to see them go for a song to a lone bidder. Hopefully a good bargain for someone.
 #151865  by Neddy
 Sat Jun 01, 2019 9:02 am
The “autopsy” video showed that all swollen cells had lost significant capacity, while cells that were not swollen hadn’t lost any.

The Atlantis study showed that cells intentionally damaged by over-discharging swelled and suffered a loss of capacity. Cells with “more pronounced” swelling had been completely destroyed.

Scubadoo wrote "Those Trademe cells look perfect."
Some may do. Some definitely DO NOT. The swollen ones have lost some electrolyte to gasification and can be expected to have reduced capacity because of this. Undamaged cells that are not swollen are a much better prospect.
 #151869  by scubadoo
 Sat Jun 01, 2019 10:59 am
FWIW. My only ever strenuous test on our 300Ah Sinopoly pack was performed in our garage prior to installation in the motorhome. A 30 minute test over 4 years ago.
At test end:
2 bar 2 x 1kW heater elements - red hot ;)
Victron 3000W PSW inverter - very warm
Wiring - warm
Battery pack outer black plastic casing - cold and unaffected - no measurable temperature increase displayed on my cheap IR thermometer.

The battery has had an easy life since only having to deliver 500 or is that 1000A for a few seconds most days and relatively low loads for the rest of the time.

With over 300Ah measured capacity still remaining in each full cell I have no concerns.
 #151872  by Nut17
 Sat Jun 01, 2019 2:34 pm
Well after a minor bidding war I do now have another LiFePO4 battery bank. I have a definite customer for half of the bank (200 AH) and I will complete a capacity test prior to assembling and offering for sale the other 200 AH.
 #151873  by scubadoo
 Sat Jun 01, 2019 2:38 pm
 #151874  by Nut17
 Sat Jun 01, 2019 2:42 pm
The equivalent cells new from AA Solar would cost $4968.00 I figured it was worth a gamble at $855.00 :-T ;) :)

I will be in Auckland on June 13 - 14th and have arranged to collect them then. No freight :TU
 #151885  by myles
 Sat Jun 01, 2019 9:41 pm
It will be interesting to see the condition of these. HiPower weren't around long and from memory their quality was a bit hit and miss (though I think there was a lot of marketing games going on at the time from other manufacturers).
  • 1
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
Pay with Paymate Express