More on LFP Charging
Some "sales" statements here, but also some possibly good info of interest. One thing is they found longest life (most cycles) was to charge at 14.4v but at lower amps at 0.3C. Some LFP owners o...
Forum Discussion
BLF said:
“How do you tell your BB "is charged" ? Also what do you mean by "is charged?
I see 3-tons also disconnects after his batt bank is full and if on shore power, he runs on LFP batt for 12v and shore power for 120v, even though he has a PD converter that can sit at 13.6 doing the 12 v while also floating the LFP at 13.6v”
****************
Close, but for added clarity, ‘IF on shore power’, I discontinue charging beyond an occasional cell-balancing, but never disconnect the battery (except for long term storage at about 50’ish % SOC…), I simply shut down the converter-charger…I would also add that you’ll know when it’s charged by watching on a LFP compatible SOC meter, the ‘to & fro’ dance of amps vs volts until end of cell-balancing when amps stops…
Here’s what I’d penned:
*****************
“Fair enough,
I’d only point out (unless I’m misunderstanding…) that this charging scenario seems to assume a practice of keeping a charged battery on an active converter-charger - but other than for ‘occasional’ cell-balancing (an activity requiring 100% SOC…) why do so with a LFP??
I would counter that this apparent consternation (possibly a FWC thingy?) mainly applies to ‘unattended set and forget’ shore power charging (as is typical with lead batts)…But even if using a ‘less that ideal’ charging device for LFP, one need ask how realistic of a scenario is this??
And, to arrive at the dreaded ‘the slide-out won’t work’ gottcha, it suggest that once ‘shore power’ charging has been completed (to whatever level?), for protection, an LFP battery needs to be sequestered….Why is this??
I’d counter that one can merely shutoff the onboard converter-charger (at it’s breaker…), at which time 12v power will come from the now charged, still active battery (minor loads only, and possibly with some solar assist?), while leaving shore power connected for 120v heavy appliances (e.g. air cond, etc)…
Regardless of the charging source (and, charged to whatever desired SOC?? - definitely NOT a lead acid thingy!!), one can simply opt to discontinue charging and just live for a considerable time off the battery’s deep reserves…This is exactly what I do, and with 400a/hr LFP and 660w of solar, seldom the need for shore or genny power - the last time I ran the genny was about 11 mos ago (and have since circumvented America…), and if in a park, ONLY use shore power where shading prevents harvest or when using air conditioner…In most other scenarios, the pass-thru inverter (concurrent with harvest) does the job…Just Saying”…
3 tons
“How do you tell your BB "is charged" ? Also what do you mean by "is charged?
I see 3-tons also disconnects after his batt bank is full and if on shore power, he runs on LFP batt for 12v and shore power for 120v, even though he has a PD converter that can sit at 13.6 doing the 12 v while also floating the LFP at 13.6v”
****************
Close, but for added clarity, ‘IF on shore power’, I discontinue charging beyond an occasional cell-balancing, but never disconnect the battery (except for long term storage at about 50’ish % SOC…), I simply shut down the converter-charger…I would also add that you’ll know when it’s charged by watching on a LFP compatible SOC meter, the ‘to & fro’ dance of amps vs volts until end of cell-balancing when amps stops…
Here’s what I’d penned:
*****************
“Fair enough,
I’d only point out (unless I’m misunderstanding…) that this charging scenario seems to assume a practice of keeping a charged battery on an active converter-charger - but other than for ‘occasional’ cell-balancing (an activity requiring 100% SOC…) why do so with a LFP??
I would counter that this apparent consternation (possibly a FWC thingy?) mainly applies to ‘unattended set and forget’ shore power charging (as is typical with lead batts)…But even if using a ‘less that ideal’ charging device for LFP, one need ask how realistic of a scenario is this??
And, to arrive at the dreaded ‘the slide-out won’t work’ gottcha, it suggest that once ‘shore power’ charging has been completed (to whatever level?), for protection, an LFP battery needs to be sequestered….Why is this??
I’d counter that one can merely shutoff the onboard converter-charger (at it’s breaker…), at which time 12v power will come from the now charged, still active battery (minor loads only, and possibly with some solar assist?), while leaving shore power connected for 120v heavy appliances (e.g. air cond, etc)…
Regardless of the charging source (and, charged to whatever desired SOC?? - definitely NOT a lead acid thingy!!), one can simply opt to discontinue charging and just live for a considerable time off the battery’s deep reserves…This is exactly what I do, and with 400a/hr LFP and 660w of solar, seldom the need for shore or genny power - the last time I ran the genny was about 11 mos ago (and have since circumvented America…), and if in a park, ONLY use shore power where shading prevents harvest or when using air conditioner…In most other scenarios, the pass-thru inverter (concurrent with harvest) does the job…Just Saying”…
3 tons
