Lithium advantage for cold weather.

Dafinga

Advanced Member
Joined
Oct 30, 2020
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36
Location
Northern Cali
I use my Hawk flatbed as a winter ski chalet and I currently run 2 6v AGM's and I am seriously thinking of switching to Lithium. I am thinking that if I don't have solar to charge my system, a Li 100ah will come up to full charge quickly and will last longer than my AGMs. I run a Webasto diesel furnace that is not a voltage hog. I do have a DC fridge but, in the winter, keeping things cold is not an issue. Worth the $$? Trying to figure it out.
 
Dafinga said:
I use my Hawk flatbed as a winter ski chalet and I currently run 2 6v AGM's and I am seriously thinking of switching to Lithium. I am thinking that if I don't have solar to charge my system, a Li 100ah will come up to full charge quickly and will last longer than my AGMs. I run a Webasto diesel furnace that is not a voltage hog. I do have a DC fridge but, in the winter, keeping things cold is not an issue. Worth the $$? Trying to figure it out.
Yes, it's worth it. I'm sure you've done your research and know what the technical advantages are. The higher initial cost of the battery will equal out over the the lifetime of the LiFePO4. The primary downside to any battery is severe cold weather. Lithium batteries are more sensitive to very cold conditions than other types of batteries. For instance, a Battleborn 100AH Lithium will stop taking a charge when the battery internal temp is at 24 degrees F or lower. It will still work down to -5 degrees F and it is still okay to discharge it 90-100%. So just keep in that in mind when you ask about "cold weather and Lithium batteries". If you have a heater you will not experience a battery shutdown in extremely cold weather as long as you can keep your battery internal temperature above 24* F. If you do manage to get below 24* F inside the camper you will need to raise the temperature to 35*F before the battery starts to charge once again. If you are camping out inside your camper and the temperature is low enough to shut down your battery, you've got much bigger problems to deal with than managing your Lithium battery charging profile. Don't sweat the small stuff.

Good luck,
Rich

.p.s. I've found that when the outside temp is in the 20's F, and I have a heater running on a minimal setting overnight, the internal battery temp will probably not drop to less than 40 F. So you'd have to have very, very cold outside conditions to limit your ability to charge a Lithium battery. You can also use a dedicated battery blanket that will run directly off the Lithium battery itself and draw about 3 amps/hr to get your battery heated up to 35* F if necessary, to start charging once again, in case your battery actually dropped below 24 F.
 
BrianG said:
Battleborn now has a 100ah battery with internal heat.
They do, but the specs are still essentially the same as the non-heated battery, that is, the same internal battery temperature parameters that shut the battery down or start it charging again still apply, in cold weather. Also, it's not automatic, you still have to manually switch on the battery heater by connecting an auxiliary positive wire on the new, heated battery version - perhaps you could use an on/off switch in a more convenience location, instead of directly at the battery. And like the alternative, the heating pad/blanket, it still consumes energy directly from the battery, while it is in the switched on position (until you manually switch it off). But reallistically, when you are in your Hawk in extremely cold weather you're not likely to let your cabin freeze over and grow icicles if you've gone to the effort and expense of installing a heater for cold weather camping. And if you keep your cabin temperature above 24 degrees F your Lithium battery will accept a charge. Happy cold-weather, Lithium battery camping!

Rich
 
Build your own and they are cheaper than AGM even with the BMS, DC-to-DC charger, etc. If you search on here, I posted the break-down, etc. It's easy to make a battery pack if you can wait for the ordered cells (about 4-5 weeks as they come from China; most cells are made there anyway).
 
Check out the LifeBlue low temperature battery. It has Bluetooth monitoring that tells you the charge and temperature. It also has the internal heating system. I just learned about them from another thread.
 
ri-f said:
Yes, it's worth it. I'm sure you've done your research and know what the technical advantages are. The higher initial cost of the battery will equal out over the the lifetime of the LiFePO4. The primary downside to any battery is severe cold weather. Lithium batteries are more sensitive to very cold conditions than other types of batteries. For instance, a Battleborn 100AH Lithium will stop taking a charge when the battery internal temp is at 24 degrees F or lower. It will still work down to -5 degrees F and it is still okay to discharge it 90-100%. So just keep in that in mind when you ask about "cold weather and Lithium batteries". If you have a heater you will not experience a battery shutdown in extremely cold weather as long as you can keep your battery internal temperature above 24* F. If you do manage to get below 24* F inside the camper you will need to raise the temperature to 35*F before the battery starts to charge once again. If you are camping out inside your camper and the temperature is low enough to shut down your battery, you've got much bigger problems to deal with than managing your Lithium battery charging profile. Don't sweat the small stuff.

Good luck,
Rich

.p.s. I've found that when the outside temp is in the 20's F, and I have a heater running on a minimal setting overnight, the internal battery temp will probably not drop to less than 40 F. So you'd have to have very, very cold outside conditions to limit your ability to charge a Lithium battery. You can also use a dedicated battery blanket that will run directly off the Lithium battery itself and draw about 3 amps/hr to get your battery heated up to 35* F if necessary, to start charging once again, in case your battery actually dropped below 24 F.
Good post Rich! Im wondering if we could we just swap out the AGM batteries with Lithium and leave the OEM FWC controller alone? Steve
 
kmcintyre said:
Build your own and they are cheaper than AGM even with the BMS, DC-to-DC charger, etc. If you search on here, I posted the break-down, etc. It's easy to make a battery pack if you can wait for the ordered cells (about 4-5 weeks as they come from China; most cells are made there anyway).
I 2nd this.. I just made a post last week in the electrical section of this forum about building your own. I built a 200ah w/ heater for about $600.00. It's easy. No need to pay more than double the price for a commercial offering.

https://www.wanderthewest.com/forum/topic/21236-diy-lithium/
 
steve whiteside said:
Good post Rich! Im wondering if we could we just swap out the AM batteries with Lithium and leave the OEM FWC controller alone? Steve
Steve,
Are you talking about swapping out the AGM batteries for a Lithium battery and keeping the Blue Seas ACR7611 as a charging relay? If so, Blue Seas does not recommend the ACR7600 with a Lithium battery setup . You'd want to swap out the ACR7611 for a compatible B2B charger or bypass it completely. You need some way to charge your Lithium, so ideally a B2B charger or solar or both will work great.

Rich
 
I had the same problem and replaced my 2 60Ah Victron gel batteries with a 100Ah lithium LifePo4 battery. I have a Fleet with diesel heater, cooler, light and som charging is the main power consumption. I also have a 275W solar panel, but not much effect where I live at this time of the year. Lithium battery works much better for me, camped this week and it was around 0F. I have a battery with internal heat and Bluetooth and find that essential. The BMS automatically stops charging when the battery is to cold and starts the internal heat until the temp limit is reached. The Bluetooth gives a good overview regarding the status of the battery (power left, current power consumption, voltage, number of cycles, charging) which makes it possible to plan and manage before you run out of power. One of the many benefits with a lithium battery is the rapid charging. I run a 30A Victron DC/DC which gives me 30Ah in one hour. So if I am running out of power I start the truck and charge the battery as much as required. On this week hunting trip for 2 nights I used around 50 Ah a day. It was cold and relatively short days when it comes to daylight so the heater was running for 16 hours a day which is around 30Ah. Then the cooler, light, charging of phone/tablet is around 15-20. It was clear weather and sunny, but it only produced 13Ah the first day and 15Ah day 2. The BMS/Bluetooth gave me full control of the situation, so I managed w/o running the truck. I have experienced the diesel heater stopped working due to not burning clean and soothing with my led batteries. When the voltage drops to low the fan slows down but the pump delivers the same amount of fuel. Leads to the wrong fuel/air mix, soot and shut down. Lithium batteries holds the voltage much better and will deliver good voltage all the way down to the BMS shut down when it is 5-10% left.
 
does cold weather damage the battery, or just no charging below 24 degrees? I live in an area that is often below 24 degrees so will it be damaged during winter storage?
 
storage and discharge are fine in the cold. Just no charging below around freezing.
 
Dessmo said:
I had the same problem and replaced my 2 60Ah Victron gel batteries with a 100Ah lithium LifePo4 battery. I have a Fleet with diesel heater, cooler, light and som charging is the main power consumption. I also have a 275W solar panel, but not much effect where I live at this time of the year. Lithium battery works much better for me, camped this week and it was around 0F. I have a battery with internal heat and Bluetooth and find that essential. The BMS automatically stops charging when the battery is to cold and starts the internal heat until the temp limit is reached. The Bluetooth gives a good overview regarding the status of the battery (power left, current power consumption, voltage, number of cycles, charging) which makes it possible to plan and manage before you run out of power. One of the many benefits with a lithium battery is the rapid charging. I run a 30A Victron DC/DC which gives me 30Ah in one hour. So if I am running out of power I start the truck and charge the battery as much as required. On this week hunting trip for 2 nights I used around 50 Ah a day. It was cold and relatively short days when it comes to daylight so the heater was running for 16 hours a day which is around 30Ah. Then the cooler, light, charging of phone/tablet is around 15-20. It was clear weather and sunny, but it only produced 13Ah the first day and 15Ah day 2. The BMS/Bluetooth gave me full control of the situation, so I managed w/o running the truck. I have experienced the diesel heater stopped working due to not burning clean and soothing with my led batteries. When the voltage drops to low the fan slows down but the pump delivers the same amount of fuel. Leads to the wrong fuel/air mix, soot and shut down. Lithium batteries holds the voltage much better and will deliver good voltage all the way down to the BMS shut down when it is 5-10% left.

That sounds like a great set up! Steve
 
Not trying to shoot the messenger, but that battleborn article is largely bollocks and has been discussed here before. Read the comments at the bottom, they essentially rigged the test so that there is no way the lead acid batteries could even come close to realistic performance. You would think the fact that they were only getting 5-25% of the rated capacity from the lead acid batteries at room temperature would have tipped them off that there was something wrong with their 'test' methodology.

Lithium performance does degrade less at low temperature although it still does loose capacity.
 
rando said:
Not trying to shoot the messenger, but that battleborn article is largely bollocks and has been discussed here before. Read the comments at the bottom, they essentially rigged the test so that there is no way the lead acid batteries could even come close to realistic performance. You would think the fact that they were only getting 5-25% of the rated capacity from the lead acid batteries at room temperature would have tipped them off that there was something wrong with their 'test' methodology.

Lithium performance does degrade less at low temperature although it still does loose capacity.
Rando, I get what you're saying, but to be fair, keep in mind that it's a commercial 'white paper', not a scientific peer-reviewed journal article. The goal of a white paper, by a for-profit company, is to persuade the reader to reach a specific conclusion. It's a marketing tool that may not present a complete picure. In that sense, calling a white paper's test results 'rigged', may be fair game, but it also implies that the company has no credibility, because they tweaked the parameters of the white paper to favor their product. But that's exactly the intention of a white paper, from a for-profit company. In a roundabout yet targeted way, they do imply that the cold weather performance of their product has merit and can exceed the capabilities of their competitors in some specific ways. They also claim that cold-weather performance will negatively affect their product.

I think that you have to take any commercial white paper with a grain of salt, but the bottom line is, if the product (in their case, a Battleborn LiFePO4 battery) works as described in the real world, then that's what counts. Of course they will try to make an AGM battery look less attractive in lab tests. The white paper may persuade you to lean toward their product, if it does, then they have succeeded with their white paper. It may also just have the opposite result, that is, it may convince you that their tests were not credible, and so, by extension, the company isn't either and you won't buy their product. That's the chance they take. It's up to us to read between the lines, or take the time to analyze complex scientific research papers on the subject, on our own, to be convinced of the claims. Making an informed decision can be a tedious process. That's the benefit of a discussion group like this. We can test the product and provide real-world feedback that includes the good, the bad, and the ugly.

Rich
 
Rich/rando... I really didn't like that white paper, and it does make me less inclined to trust Battleborn. That said, I have two of their batteries.
 
Vic Harder said:
Rich/rando... I really didn't like that white paper, and it does make me less inclined to trust Battleborn. That said, I have two of their batteries.
Vic, I know, right? I too bought one of their batteries. Fortunately, it has performed well for me, in both hot and cold conditions and I have no complaints about it...yet.

Rich
 
I understand why they did this - the one thing lithium batteries have a bad rap for in the community is cold weather performance (which I personally think is overblown) and they are trying to counter this with some creative marketing.

However, the fact that they were borderline dishonest in their 'head-to-head' test reflects poorly on their company and we should call them out for it. The technology has many advantages and stands on it's own, there is no need for them to be disingenuous.
 
Morton's on the move you tube channel has a test video comparing BB and others as a followup to BB's test. It would be interesting to hear some thoughts on Tom's tests,
It's cold in northern Minnesota this week, Bigfoot Dave
 
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