Electric chainsaw for mill work

[Joe Hillmann]

What I read is the small pack heaters take very little power and once at temp in a couple seconds the batteries create heat so it's just to get full output fast with out cell damage. I am looking at the 100ah 48 volt batteries (6x) from Signature Solar to set up a system to play with

I think it depends on how cold the batteries are when the heater kicks on that determines how much power it takes to heat the batteries.
If it is -20F and you were using the batteries heavy it won't take much to get them above freezing to take a charge.
On the other hand if it is -20f and the batteries ran out of charge and have been sitting idle for the last 6 hours it is going to take a lot of energy to get that battery up to above freezing so it can take a charge.
I originally planned to go with LIFEPO4 batteries on our house but the inability to charge below freezing and the complexity of a BMS has made me decide to go with lead acid for now and hopefully in 5 to 7 years when they need to be replaced I will have better options than I do now.

[OlJarhead]

For me it was 8 year old FLAs that made me look and I found more power (usable) in LiPos for about twice the price.  Considering they should last more than twice as long I'm saving $$$ 😉

Now, I do have a room I built to keep them warn so no issues there either.

I'll let you know how they work out though!

[Broncman]

I did my daughter's RV last fall with a Renogy 48v Lifpo system and invertor.

I placed the Lifpo batteries in an insulated compartment.  Never had an issue. We need more solar cells but her RV roof is full.

We did have issues with a Lead Acid battery freezing in another system.  

I love the ability to be off grid...but it is expensive still and would love to see prices come down.

[OlJarhead]

I built my system in stages over several years but it is speedy either way ;)