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
BB says the surface charge voltage 14.4 -14.6v when the batt is fully charged and is at Vabs drops to 13.6 when that surface charge is gone and the batt is resting at full 100% SOC.
FWC says it drops to 13.2-13.3 but that is under a load, as though somehow the 13.6 was still with a surface charge and now all the surface charge is gone, but he did not say that the batt is still full. Not clear what he really means by that.
My new plan (see earlier post) is to never mind what the capacity is of the LFP you just got. Find out the AH allowance you can have with it, and pretend that is the capacity. Use the AH counting monitor to keep track of what's left of your allowance while camping and recharge as required.
BTW, FWC, you know darn well where that 113AH came from. That was from saying the 1536 Wh was correct. You said that 1536 was fictional, but the 120AH is correct. You never said why to believe that AH number and not the Wh number.
Also "nominal" is in English, so we know what it means. It happens that FLA and AGMs both use nominal voltages , 12v and 6v, eg, while LFPs use 12.8v as "nominal" No problem. We don't use "12v" when using the resting voltage vs SOC tables for those batts either. We use whatever the batt specs say is the resting voltage at 100%.
Many FLAs use 12.7 as "full" while AGMs use 13.0 as full. No problem. eg my AGMs were 12.4 as 50% while my 6s were 12.1 as 50% (it stayed at 0.3 diff for that range of SOCs) AH count still works. Just means use the right voltage for that battery as your cross-check when "matching".
With LFPs it seems you can't believe the Wh or the AH ratings to use with your monitor and you can't really match the voltage with the AH count to do cross checks.
Apparently all you have is your AH counter to go by. So my new plan is to use your "allowance" (as described earlier) and use that as your "capacity" never mind what the real capacity might be in the strange LFP wonder-world of inconsistent numbers. YMMV (and no doubt does! :) )
FWC says it drops to 13.2-13.3 but that is under a load, as though somehow the 13.6 was still with a surface charge and now all the surface charge is gone, but he did not say that the batt is still full. Not clear what he really means by that.
My new plan (see earlier post) is to never mind what the capacity is of the LFP you just got. Find out the AH allowance you can have with it, and pretend that is the capacity. Use the AH counting monitor to keep track of what's left of your allowance while camping and recharge as required.
BTW, FWC, you know darn well where that 113AH came from. That was from saying the 1536 Wh was correct. You said that 1536 was fictional, but the 120AH is correct. You never said why to believe that AH number and not the Wh number.
Also "nominal" is in English, so we know what it means. It happens that FLA and AGMs both use nominal voltages , 12v and 6v, eg, while LFPs use 12.8v as "nominal" No problem. We don't use "12v" when using the resting voltage vs SOC tables for those batts either. We use whatever the batt specs say is the resting voltage at 100%.
Many FLAs use 12.7 as "full" while AGMs use 13.0 as full. No problem. eg my AGMs were 12.4 as 50% while my 6s were 12.1 as 50% (it stayed at 0.3 diff for that range of SOCs) AH count still works. Just means use the right voltage for that battery as your cross-check when "matching".
With LFPs it seems you can't believe the Wh or the AH ratings to use with your monitor and you can't really match the voltage with the AH count to do cross checks.
Apparently all you have is your AH counter to go by. So my new plan is to use your "allowance" (as described earlier) and use that as your "capacity" never mind what the real capacity might be in the strange LFP wonder-world of inconsistent numbers. YMMV (and no doubt does! :) )
