LFP on Shore Power with Inverter/charger?
An inverter/charger requires that you have a battery connected (or some 12v source) so it will supply any 12v to the RV. (Unlike a converter that will do 12v with no battery) Some say not to float...
Forum Discussion
It is true that the resting voltage depends on the state of charge - but a resting voltage somewhere in the middle of the SOC range is what you should use for your system design.
BFL (who has no experience with lithium as far as I can tell) has been bandying around some misleading math based on a resting voltage of 13.6V, that is leading to some odd claims that a 120Ah battery is actually 113Ah.
This would be the same as saying your AGM battery nominal voltage is something like 13.4V or what ever it is when it comes off the charger. We all know that it not accurate, as soon as it is loaded this surface charge will be gone and the voltage will drop to 12.6 - 12.8V. Same deal with lithium, as soon as you load the battery, the voltage will drop to ~13.2 - 13.3V.
BFL (who has no experience with lithium as far as I can tell) has been bandying around some misleading math based on a resting voltage of 13.6V, that is leading to some odd claims that a 120Ah battery is actually 113Ah.
This would be the same as saying your AGM battery nominal voltage is something like 13.4V or what ever it is when it comes off the charger. We all know that it not accurate, as soon as it is loaded this surface charge will be gone and the voltage will drop to 12.6 - 12.8V. Same deal with lithium, as soon as you load the battery, the voltage will drop to ~13.2 - 13.3V.
StirCrazy wrote:FWC wrote:
PS the resting or 'nominal' voltage of LiFePO4 is NOT 13.6V. The resting voltage is 13.2 - 13.3 and the 'nominal' voltage is 12.8V.
thats kind of a bold and misleading statment. the resting voltage all depends on state of charge, if you are 100% charged then the resting voltage is 13.6V
Steve
