PerryB67 wrote:
Tom_M wrote:
The battery tested turned out that it had no low temperature cut-off. Will Prowse has done similar tests with the same results for the cheap batteries. If you plan on using the battery and know it will not get down below freezing it would be a good choice.
No Thanks!
Another Minnesota resident that finds a low-temp shutoff mandatory.
Enjoy,
Perry
From my ‘actual’ 200a/h LFP off-grid experiences, Low temp shutoff might matter most where one lacks the option for either interior mounting, or the ability to manually shut-off their charging sources (e.g. solar controller) - it doesn’t mean that you can’t continue to camp and discharge the battery…For the uninitiated, where ‘attended charging’ is one’s practice, low temp shutoff is not necessarily of high value - JMO
Consider, that with the vast increase in ‘usable capacity’ (often double…), in my camping scenarios (often, deferred charging) there’s always been enough remaining reserve to get thru to and exploit the next available harvest window, and since LFP’s recovery rate is much faster than sluggish lead-acid, and their voltage curve is uber flat, then, except for an occasional cell-rebalancing there’s seldom a real need for a full recharge…In fact, even in the snow my FLA target charge range is somewhere between *30-90% SOC - This, in my own view is what paradoxically seems to elude many FLA veterans…I was even able to run the microwave at over 130 dc amps when below 05% SOC, followed-up by making coffee (125a!) using the Keurig!!
*30%, this a nearly a 60 usable a/hr remaining reserve, using about 20 a/hrs (mostly furnace) throughout the night…
Storing LFP is even easier since their self-discharge rate is uber low, thus (assuming, disconnected) they can be stored in freezing weather…
3 tons
