Heating diy battery?

[ericfx1984]

Getting ready to build a 16s lifepo4 battery, 280ah eve cells

I'll be using a 200a JBD BMS

What are some affordable options for heating the cells?

Thanks in advance

 

[Rednecktek]

24v heating blankets in series through a basic thermostat is going to be the easiest and cheapest way most likely. The silicone heating pads are either really tiny so you needca lot of them or really expensive for the large ones.

RV water tank heating pads are also an option but you'll need a step down converter for them.

 

[sunshine_eggo]

Simple, Indipendent Battery Box Heater

To get the document, click on the orange button at the top of the page. This is a simple 20W battery Box heater that operates independently of the rest of your system. I use this for storing unused cells in a very cold climate, but it can be...

diysolarforum.com

 

[ericfx1984]

24v heating blankets in series through a basic thermostat is going to be the easiest and cheapest way most likely. The silicone heating pads are either really tiny so you needca lot of them or really expensive for the large ones.

RV water tank heating pads are also an option but you'll need a step down converter for them.

Any suggestions on the thermostat?

 

[Rednecktek]

Any suggestions on the thermostat?

I've used a lot of these basic guys over the years for various projects. Centigrade only but works for my needs.

 

[ericfx1984]

I've used a lot of these basic guys over the years for various projects. Centigrade only but works for my needs.

Are they available in 48v?

 

[ericfx1984]

I'm still looking for a 16S lifepo4 compatible thermostat

 

[Rednecktek]

I think you might only have a few options to make it happen. Step down transformer 48v -> 12v -> thermostat -> relay -> heating pad. I haven't been able to find anything that isn't 12v, 120v, or 220v. I had to do something similar with a 12v supply from my 12v bus feeding a relay to turn on the 24v heating pads inside my battery case.

 

[ericfx1984]

Battery hookup had these for $4 a piece on sale yesterday... so I picked up a few of them

 

[ericfx1984]

I think you might only have a few options to make it happen. Step down transformer 48v -> 12v -> thermostat -> relay -> heating pad. I haven't been able to find anything that isn't 12v, 120v, or 220v. I had to do something similar with a 12v supply from my 12v bus feeding a relay to turn on the 24v heating pads inside my battery case.

So are you suggesting a 48 volt to 12 volt converter to drive this unit and then use this unit to drive a 48 volt relay?

 

[chriscappuccio]

why not just put four pads in series? conversion is another failure point, plus less efficient

 

[featherlite]

just put four pads in series

Given that each pad is 24v, do you mean put two pads in series?

 

[chriscappuccio]

it seems like people are going well above the voltage of the panels to ensure the pads aren't getting too hot or something. i haven't actually done it yet.