200a/hr LFP Load test results…
I choose not to charge my 200a/h LFP from the alternator because (say, once fully charged…) I prefer not to have it maintained at say 100% SOC…I suppose a switch would remedy this, but as primarily a ‘desert camper’ I’m mostly able to keep within a decent SOC range (based on usage) with just harvest alone…
So, I recently conducted a hands-on real world amp/hr test to determine just how much ‘head room’ I might be able to rely upon (capacity rumors aside…) from this single 200a/h LFP battery and found out quite to my own utter amazement that (per Victron meter) the microwave could still run at a whopping 138 amps with the battery even at only 1% SOC!!…. Just to be sure about this I repeated this using a Keurig brewer (@124 amps) and got the same result… So to the LFP uninitiated (non-LFP users - I donno??) this claim might indeed sound at least a bit dubious (I concur!), but it is an empirical hands-on fact - How could this be?? FWIW, this 200a/h battery actually bench tested at a net 215a/hrs before the BMS cut-out!!…Details:
At 1% SOC (while still under this uber heavy load) the voltage was still at 11.10v with 201a/h consumed amp/hrs per the Victron BMS display (1% is as low as it’ll read), but the voltage recovered to 12.06 shortly after the M/W had finished it’s last tasking…
Note too that the ProSine 2.0 inverter’s low voltage alarm never once sounded…
So in abstract terms, this arguably might equate to four GC’s with a lower limit of say 50% SOC, but at only 65# (rather than 245# minus cabling…) and with a near insignificant amount of voltage sag…Quite honestly, I’d always gotten decent service from my former two GC’s (based on camping style and harvest) but often with a few ‘white knuckle’ episodes thrown into the mix (Ugg…)…I’d be most interested in hearing other’s testimonies :), and would encourage a ‘bench test’ as well !!
I can’t say how widespread this is, but hope this example might add to the LFP knowledge base..
3 tons
So, I recently conducted a hands-on real world amp/hr test to determine just how much ‘head room’ I might be able to rely upon (capacity rumors aside…) from this single 200a/h LFP battery and found out quite to my own utter amazement that (per Victron meter) the microwave could still run at a whopping 138 amps with the battery even at only 1% SOC!!…. Just to be sure about this I repeated this using a Keurig brewer (@124 amps) and got the same result… So to the LFP uninitiated (non-LFP users - I donno??) this claim might indeed sound at least a bit dubious (I concur!), but it is an empirical hands-on fact - How could this be?? FWIW, this 200a/h battery actually bench tested at a net 215a/hrs before the BMS cut-out!!…Details:
At 1% SOC (while still under this uber heavy load) the voltage was still at 11.10v with 201a/h consumed amp/hrs per the Victron BMS display (1% is as low as it’ll read), but the voltage recovered to 12.06 shortly after the M/W had finished it’s last tasking…
Note too that the ProSine 2.0 inverter’s low voltage alarm never once sounded…
So in abstract terms, this arguably might equate to four GC’s with a lower limit of say 50% SOC, but at only 65# (rather than 245# minus cabling…) and with a near insignificant amount of voltage sag…Quite honestly, I’d always gotten decent service from my former two GC’s (based on camping style and harvest) but often with a few ‘white knuckle’ episodes thrown into the mix (Ugg…)…I’d be most interested in hearing other’s testimonies :), and would encourage a ‘bench test’ as well !!
I can’t say how widespread this is, but hope this example might add to the LFP knowledge base..
3 tons
