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
Itinerant1 wrote:
I'll be interested in the high draw items and length of time before the battery voltage/ inverter tags out with Si02.;
I tested for that in the TC to see if the one 100AH would run the inverter with MW draw like I bought it to do. Each set-up would act differently what with wiring and equipment, but The Trimetric showed a 65 amp draw fairly steady for about 35 -40 minutes roughly before the inverter quit due to low voltage.
Bounce back voltage soon after is 20% on the chart, but there is suspicion SOC would be higher if I had waited a day for a higher "resting " voltage.
The result I got matches the spec constant current discharge chart for 67 amps and 45 minutes to "end voltage" so at least that part came out right.
The problem is those tables don't say when your inverter will conk out, just what the "end voltage" is.
With the "flat" LFP voltage, you should be above inverter shut down farther along towards "end voltage" and you are already ahead of the game by having way higher voltages per SOC than the SiO2's.
Scroll down to the table on page 2
https://soneil.com/wp-content/uploads/2018/07/12-EFSM-100.pdf
It would interesting to see an LFP one to compare times per constant amps at selected high amps discharge. Anybody have a link to an LFP one?
Note the SiO2's IR is 6.5 mOhms, An ordinary AGM's is about 5 mOhms, and an LFP's is way low, so high draw is not all about IR, but could be a factor I suppose.
I disagree with PT suggesting SiO2 could be an alternative to LFP. I think they are two different animals, which each fitting certain scenarios. EG, the blurb says SiO2 caught on in Oz because of the high ambient temp they could be used at, and only later got noticed in North America. Whatever, no skin off my nose.
I ended up having to buy a second one with a changed scenario (DW moved the goalposts :) ) so if she had done that earlier I could have just got two AGMs for the job at hand. Oh well--now I am the proud owner of two SiO2s. Big warning there for LFP buyers! Get the scenario straight first unless you have deep pockets.
