Anyone installed their LiFePO4 battery in a small Container and attaining acceptable temperature?

[adriansantos]

Good day,

A lot of thanks to Mr Prowse and i ventured to the LiFePo4 from lead acid batts.
Here is the background of my Setup:

24v system
- 8 pc 3.2 Sinopoly LiFePO4 (second hand) 90amps. got it for (est 300 USD total) with a 8s BMS (Daly generic i think)
- did bottom balance then top balance. Did capacity test, i achieved 2200 watts hrs at 2.8v each cell remaining (average).
- installed an active balancer and improved capacity by 10-15%, all cells.

Purpose:
- Power supply for my aquaponic system and night lights (using a 20a 24v-->12v DC-DC stepdown converter)
--> 18 watts 12v Water pump (24x7)
--> 18 watts 12v Air pump (aeraotor) (24x7)
--> total of 40 watts of 12v LED lights (12 hours usage)
Panel:
- 340 watts Polypanel by JA solar
SCC: Victron 100/20 smartsolar
Location: South of the Philippines (warmer since near the equator)

Concerns:
1. I read ideal temp should be at room temp of 25 deg Celcius, our temp here averages 31-33 deg Celcius
2. Initially planned to install the battery cabinet inside the greenhouse but decided it will be installed outside due to very high humidity and occasional high temp,
reaching 41 deg

Further plans:
1. waiting for 2 12v Fan that will be connected to an automatic switch thermostat, will set to turn on at 30 deg celcius although im quite sure it wont decrease the
temperature by that much, main goal is not to reach 40 deg
2. It rained today and i way able to test if any water leak inside, luckily no signifcant water leak
3. Pic of batteries inside the plastic storage box is temporary, i plan to install it on top of the wood planks at the bottom of the cabinet, and the rest of the junction box, MPPT about 2 feet above it sepated by anothe layer of 1 inch plyboard


I attached some pics of the setup, hoping for any helpful advice or comments



Thanks!

 

[snoobler]

Not sure about any of your concerns, but the Victron SCC should be mounted vertically to allow the cooling fins to work.

 

[adriansantos]

Not sure about any of your concerns, but the Victron SCC should be mounted vertically to allow the cooling fins to work.

Oh yes, it will be mounted vertically, i havent installed it yet
My main concern is the temperature, since the cabinet is exposed outside, max i got was 41 deg celcius.
Am I right to assume, keeping battery below the 45 deg Celcius is acceptable? No way i will get a 25 deg in my area without a Peltier

 

[snoobler]

45 is pretty toasty, and it will reduce your cycle life. How much? Probably not enough to matter.

If you don't need the entire capacity, pulling back to a charge voltage of 14V vs. 14.4V should help offset that. If your ventilation system works to keep the battery near ambient temperature, that should suffice.

 

[adriansantos]

45 is pretty toasty, and it will reduce your cycle life. How much? Probably not enough to matter.

If you don't need the entire capacity, pulling back to a charge voltage of 14V vs. 14.4V should help offset that. If your ventilation system works to keep the battery near ambient temperature, that should suffice.

I set the absorb to 14.0 and float to 13.5. Your right i wont be using the entire capacity, just less than half. Just made it bigger for possible bot so sunny days. Thanks!