Discover and Fortress are all I use for LFP. Closed loop charging with XW based on Soc and UL9540 for my clients in California. Game changer for me. So the low temp problem for offgrid is going to be solved. We just keep them from freezing for now in an offgrid home. Disagree that Life Blue is the only one and they do not close loop charge with XW! Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [1] e-mail offgridso...@sti.net [2] text 209 813 0060
On Sun, 6 Jun 2021 13:49:44 -0400, Ray wrote: This is the way any battery designed for off grid use should be set up. Life Blue may be a small supplier, but they are technically way ahead of the Li+ pack on monitoring, BMS, and cold weather operation. SOC: No complicated comm, just blue tooth on a phone, don't even need cell service. It works, even before you unpack the battery. BMS: can mostly accept default lead acid controller and inverter settings, so no weird compatibility issues. Just swap batteries. Heating: just optimizes the PV to do the job, no external fuss. In the end, as fancy as these are on the inside, they literally are just a drop-in replacement for an equivalent 12 v lead acid battery, even the same form factor. Their only problem is they don't come in 24 and 48 v offerings. Full Disclosure: I am not affiliated in any way with LiFe Blue, I just appreciate good practical engineering. Other manus seem to have almost zero desire to listen to wrenches and improve their designs. Ray Walters Remote Solar 303 505-8760 On 6/6/21 1:31 PM, la...@starlightsolar.com [3] wrote: The problem with Battle born heated battery is that it was an after thought. It uses power from the battery to heat itself and may fully discharge the battery. LiFeBlue battery does not use any energy from the battery for heating. It also has an advanced BMS-heater controller that can pass low current, up to 0.07C, directly to the cells so early morning PV solar power is fully utilized until enough charge current is available to turn on the internal heater. In addition to all batteries having Bluetooth SoC monitoring built in, the Version 3 batteries have dual modbus ports for developing communications and control. https://www.lifebluebattery.com/rv-boat-low-temperature-lithium-ion-batteries/300ah-d-lt-lithium-battery.html [4] Larry Crutcher Starlight Solar Power Systems (Disclosure: I have a financial interest in LiFeBlue Battery) On Jun 5, 2021, at 4:52 PM, Chris Worcester wrote: Check out Battle Born Batteries out of Reno, they have heater kits available for their LiFePO4 100 ah batteries. Just came out with a 280 ah 8D size, don't see a heater kit for it yet. Will check back in with them soon to see if it's on the shelf. Chris Worcester Solar Wind Works NABCEP PV Installation Professional Cell 530-448-9692 www.solarwindworks.com [6] ch...@solarwindworks.com [7] -----Original Message----- From: RE-wrenches [8] On Behalf Of Dave Angelini Offgrid Solar Sent: Friday, May 21, 2021 12:33 PM To: RE-wrenches [9] Subject: Re: [RE-wrenches] LiFePo4 Low Temp Charging Damage I can think of a few other things for the wish list! l Closed loop charging with multiple sources. Robust BMS design to not be a new source of power failures Offgrid. Spare BMS for sale with product that is servicable. Gets Soc and temp into Insight and Optics A company that will be there when I need them. Too many players in the battery game right now that I do not know of! Only a few that do most all of these for me. Friday ! Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ [10] e-mail offgridso...@sti.net [11] text 209 813 0060 On Fri, 21 May 2021 12:24:11 -0400, Ray [12] wrote: This is the only company I know of that has dealt with the low temperature charging issue. Its a great product, and the blue tooth monitoring is an excellent feature too. This is what the other Li+ batteries should be doing. The big down side is they are currently limited to 12v. Wish they made a 48v pack. https://www.lifebluebattery.com/rv-boat-low-temperature-lithium-ion-batteries/index.html [13] Ray Walters Remote Solar 303 505-8760 On 5/21/21 12:12 PM, Larry wrote: My personal opinion is that you should not buy any lithium battery that does not provide adequate protection for all modes of operation. Freezing does not damage the battery; charging a frozen battery may damage it quickly. Trickle charging the battery is not the solution. There are two solutions: provide a heat source to keep the batteries above freezing or incorporate a temperature controller to disable the charger if the battery is unsafe to charge. Larry Crutcher On May 21, 2021, at 8:44 AM, Mark Frye [14] wrote: Folks, If I have a charger that does not have low battery charge cut-off, I can get in trouble if I have a frozen pack and apply a charging voltage. But, if I start with a pack that is above freezing and keep a trickle charge on it, can I keep that pack safe from freezing and damage? Or at some point, as ambient temperature drops, the pack will freeze and be damaged anyway? 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