I did this modification to a 16kW Blue Ion LiFP bank during installation, following this guide, Darryl. Blue Planet had sent me this. Shortly after initial installation a plumber had installed an electric space heater in an unheated space with water pipes, which of course soon drained the batteries to LVD, so the BMS had shut them down. The BMS won’t accept a charge until the batteries were about 1 1/2 degrees F above freezing. I did a winter service call and worked with BP tech support. I plugged the same space heater into a portable gennie and pointed it to the batteries, and as soon as the BMS registered above freezing it allowed recharge from the array. As I recall, besides the bubble/Mylar insulation (which was surprisingly easy to install) the system used an 18w terrarium heating pad in the bottom shelf under the batteries and a 9w pad on the upper shelf, controlled by an external freeze-prevention thermostat. With a sufficient whole-house array it’s proven to be a negligible load. It’s a standalone system. I don’t recall the low-temperature discharge limit; it’s quite a bit lower than the minimum charge temperature. And summer heating is irrelevant with the thermostat. The rest you can get from Blue Planet. Allan On Nov 5, 2023, at 2:03 PM, Darryl Thayer via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:
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