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
Steve, thanks for the clarification. I was using CCA because it is the only thing I can think of with battery ratings that are a measure of its power. FWC said a battery's power is its max current at its nominal voltage (if I got that right) so 800CCA is twice the power of 400CCA.
I don't know where an RVer cares about power as such. Ads saying a battery has "twice the power" got me wondering what that is supposed to mean. Seems to be "Sales" talk. ?
That Odyssey 31 hybrid battery that allows a high draw makes that claim, and ISTR LFP ads saying that too.
Another puzzle is how they do AH with LFPs, but that only matters to those who operate them trying to keep track of usage while camping if they even do that.
EG, The blurbs say don't use Peukert, but still say the LFP is 100AH because they ran it down at 100 amps in 1 hour so that is 100AH. Then they sort of dance around saying it also takes 20 hours to run it down at 5 amps, so that is 100AH at the 20 hr rate. But no Peukert here folks! :) It makes your head spin.
Then they start in with the Wh, but use the 12.8 nominal voltage to get the AH. OR----did they get the AH first and then invent the Wh????
In the previous example, it was 1536 Wh and 120 AH at 12.8v
The battery is full at 13.6v so that is where you have to start. Either:
A. the battery is really 1536/13.6 = 113AH , or
B. the battery is really 120AH so x 13.6 = 1632 Wh
Which is it? If you are monitoring by Wh usage or AH usage, I would think that is important for setting up your monitor.
Not a clue. so Steve, what are you going to do for operating your "280AH" battery for setting up a monitor? Just curious on my part, but other LFPers might be interested. ?
I don't know where an RVer cares about power as such. Ads saying a battery has "twice the power" got me wondering what that is supposed to mean. Seems to be "Sales" talk. ?
That Odyssey 31 hybrid battery that allows a high draw makes that claim, and ISTR LFP ads saying that too.
Another puzzle is how they do AH with LFPs, but that only matters to those who operate them trying to keep track of usage while camping if they even do that.
EG, The blurbs say don't use Peukert, but still say the LFP is 100AH because they ran it down at 100 amps in 1 hour so that is 100AH. Then they sort of dance around saying it also takes 20 hours to run it down at 5 amps, so that is 100AH at the 20 hr rate. But no Peukert here folks! :) It makes your head spin.
Then they start in with the Wh, but use the 12.8 nominal voltage to get the AH. OR----did they get the AH first and then invent the Wh????
In the previous example, it was 1536 Wh and 120 AH at 12.8v
The battery is full at 13.6v so that is where you have to start. Either:
A. the battery is really 1536/13.6 = 113AH , or
B. the battery is really 120AH so x 13.6 = 1632 Wh
Which is it? If you are monitoring by Wh usage or AH usage, I would think that is important for setting up your monitor.
Not a clue. so Steve, what are you going to do for operating your "280AH" battery for setting up a monitor? Just curious on my part, but other LFPers might be interested. ?
