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Victron has just released this video: about a LFP conversion in a sail boat and they solve the heating problem with a silicone heating pad as well. They use the Venus GX to sense the low temp so not really a go to solution for everyone though. The battery install starts around 4:30.

Yes I can see how there is a technical solution for it and said solution could be more or less complicated. My point is that IF this is a actual problem I have a very hard time believing company’s like Victron wouldn’t state it in their manuals or sell products eliminating the risk. I’m no...

Great house! Nice to see some off grid projects from this part of the world. Where in Finland is this? How is your solar setup going to be?

Been comparing some stats now and seems like the LYP cells has a wider operating voltage range over the LFP cells. Screenshots from ev-power.eu that sells Winston here in Europe (also Sinopoly and Calb). The operating voltage at 80% DOD column also differs a bit as you can see. Still the voltage...

Thanks for sharing your build, looks very neat and tidy! I just wanted to comment on the CAT6 problem. Usually (at least here in Europe) CAT6, and other network cabling, are solid core if it is installation cable. Meaning it's for permanent installation in walls terminating in wall outlets...

I got this one https://www.aliexpress.com/item/1583908329.html?spm=a2g0s.9042311.0.0.4b764c4dGkhhQE Haven't really used it more then I've connected it to a battery and felt it heat up. Can do some testing on it to see how hot it gets, maybe after the weekend. Perhaps it's a bit too powerful...

Ok, what if we put a relay between the PV and the SCC? Follow my train of thought: We only use a temperature control relay, not a voltage one, and it senses the battery temp to be under say 5°C. It triggers the PV relay to switch and instead pass power directly to the heating pad, bypassing...

Tried that, no real good answer there either unfortunately. Sorry for cutting in and going a bit OT. :)

So I’ve been in contact with EV-Power.eu, they’re the European retailer for Winston LiFeYPO4. Turns out that LYP batteries are barely better then LFP batteries for colder temperatures. This is the answer I’ve got when asking about storage and charging temperatures for their Winston LiFeYPO4...

Hi! First post for me here. Have only been lurking and reading before. Watched Wills videos on YT and it definitely opened my eyes for LiFePO4 batteries. I have a truck camper that I'm rebuilding and going to use mostly during winter for skiing. My plan so far has been to build a battery out...

Yeah, the price is steep.. But I haven't seen any other prismatic LTOs? I'm not buying today so no rush, it is a rapidly developing market after all..

Very interesting!! What other components will you be using? Please share your thought more on why LTO and not LiFePO4. Do you know the weight difference between your cells and a comparable LFP bank?

Wonder what that’s been used for? Crazy big and crazy prize, at least for me that’s thinking RV and cabin solar systems.

Interesting, wonder if that’s because of the higher voltages and currents or to just lower the price on the smaller SCCs?

Good points! More or less taking the positive attributes of LFP and putting them in lead-acid. But how many Ah is that battery?! Very detailed spec sheet but I can't find it... ?

Ah! (y)

Yes, I saw those and they where clear, it was the E31 and G31 that was unclear. Still is to be honest..

Sorry, disregard my comment #28. I read the thread on Dacians forum that you link to where he explains.

How did it work out? I’ve got a silicone heating pad from AliExpress and it’s 12V so eliminates the need for a step-down. Haven’t got any batteries yet so only tested it on the work bench.

Link to the videos? I would love to see more!

This is a “problem” I’ve recently been made aware of in this thread LiFePO4 heating pad for cold temperatures. To me it seems crazy that Victron would sell a system that could possibly damage the SCC if the BMS cuts off the battery, for any reason. It shouldn’t matter if it’s a built in BMS in a...

Very nice topic! I'm also looking for a battery with ability to work in cold climate. What's your reson looking at LiFeYPO rather than LTO?

So. I've ordered and received this silicone heating mat from Keenovo a few month ago. It seems decent and relative high quality. It heats up good and has a 3M adhesive backing. I also ordered this Digital Temperature Controller XH-W3001, but haven't tested it yet. Funny enough I haven't got any...

No sorry, not any more insight then that LTO is much more expensive upfront then LFO. If you consider cycles then it's probably closer in price, but I haven't done the math. I'll have to read up on LiFeYPO!

Well, you’re somewhat correct. It’s not that you’ll need to heat regular LFPs all the time in sub zero temp, but only until they’re above 0°C. After that the charging most likely heats them “naturally”. But I agree with you in some ways, it feels stupid to use power to be able to collect power...

Interesting technology! I’ll have to read up some more on them. Probably not an option for me as I’m also mobile but if you’re stationary sure. But how many Ah is the E31 and the G31?! Am I blind, because I can’t seem to find it.. ?

Ok, did not know that! It sounds risky. I mean then it would also destroy the SCC if the BMS cut out because of high temp and also high/low SOC?! Lots of variables for destruction that.

Why would a low temp disconnect at the battery side damage the SCC?

Wow! That’s a big battery, what type of battery setup do you have? Voltage and SCC? Interesting that is works so well in Korsnäs, I’m from Örnsköldsvik originally so that’s just across the water, can’t be more than 150km. I live further west now but basically on the same latitude.

Reading the thread with great interest since I’m looking at the same battery temperature problem. Have you considered using LTO batteries?