Lithium P04 battery for fridge

[ErichFromm]

So I used my new engel combi fridge for the oxfam 100km walk over weekend. The battery I got is 135ah, and the fridge 2.5 per hour. Somehow though the battery drained in only 24 hours and is only showing 12 volts.

I thought I'd just recharge but it won't move off 12 volts. Looking it up I guessed the low discharge fail-safe must have been triggered so reset the battery with the supplied shunt things. No difference.

I've sent a note to hardkorr but nothing back yet. Any suggestions?

I'm disappointed a 135ah battery only lasted 24 hours (and lithium p04 at that!).

Thanks

[1iron]

The battery should have lasted longer than that providing that you are using the engel as a fridge and not a freezer. I run my old engel (1980s) on 36 volt lawn mower batteries with electronics to reduce to 12 volt. A 36V 6 Ah will run my fridge for 24 hours. Need to check the fridge draws 2.5 amps using a multimeter if thats the case problem is the battery.

[icefest]

I've just bought this aliexpress 12v, 200ah battery.

Only $529.75 delivered, (but no warranty etc) Send a PM in a months time and I'll tell you how it goes.

Most lipo4 have a lower voltage of 10v, so you could perhaps only have run it partway down.

[Moondog55]

https://www.aldi.com.au/saturday-detail ... battery-3/
Headed to the local store at dawn to get in the queue
I'd expect 100Ah to give me three nites of CPAP use and they are power hogs
So hoping the matching solar panel helps
https://www.aldi.com.au/saturday-detail ... at-200w-1/

[Warin]

I thought I'd just recharge but it won't move off 12 volts. Looking it up I guessed the low discharge fail-safe must have been triggered so reset the battery with the supplied shunt things. No difference.

I've sent a note to hardkorr but nothing back yet. Any suggestions?

Older battery chargers may not work with new technology batteries. I found a completely discharged AGM battery would not charge just from a battery charger, with a normal lead acid battery connected as well .. it finally charged.

Good luck.

[Off-track]

There are various Li-ion battery chemistries (LiPo, LFP, LCO, LMn, LNMC, etc) with different properties https://www.science.org.au/curious/technology-future/lithium-ion-batteries, not to mention different quality manufacturers.
Which one do you have?

From https://scithings.id.au/LFP.pdf

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