This is a 24V bank of NiFe batteries with 20 cells, they are in great condition and have been used for less than 1 year. The customer upgraded to an autowatering system which required the cells to be swapped over to have the watering system. There is nothing wrong with them and they have been performing very well.
Invented over 100 years ago by Thomas Edison as a non-polluting and non-consumable alternative to Lead Acid Batteries using no heavy metals! Now manufactured once again worldwide after lead acid battery companies closed Edison's Plant in 1972.
We have sourced NiFe at a competative rate at a little over double our cheap lead acid range and similar to our Rolls battery prices. This makes them a very viable option for long term off grid solutions.
You need 10 cells to make up a 12V bank, 20 cells for a 24V bank and 40 cells for a 48V bank
They have low operation cost, low self-discharge, long cycling life and environmental-friendly. They can withstand deep discharge, wide temperature variations, mechanical & electrical abuses and still show excellent and reliable performance over a long period. The operation life of solar Ni-Fe batteries is 30-40 Years, the working temperature range can be -40°C to 60°C, which is also the longest life battery for the PV system.
For more information on the advantages of NiFE batteries please read our info here