Lithium batteries and alternator protection.
The six 6 volt lead-acid house batteries in my class A DP have gone bad. I am looking to replace them with 6 Battleborn 100Ah 12v LiFePO batteries. Eventually I will be adding solar. I am not look...
Forum Discussion
BFL13 wrote:Tom/Barb wrote:BFL13 wrote:
If the DC-DC is charging the house batts with 30 amps at 14.2v , that is 426 watts output..
the fallacy of your theory is Alternators don't always operate at peek power/voltage/potential
The 30 Amp DCtoDC Charger is a limit, not a constant amperage.
We have had several threads about this. A recent one that might explain your set-up was that a "30A" DC-DC means output for a Renogy, but it could mean input for another brand.
In any case, input is higher in watts than output. If the input limit is 30A then at 13.2v that is 396 watts. Charger efficiency of 95% (being very generous) means output is 376 watts.
376/14.2 = 26.5 amps charging from the charger minus any wiring loss to the house batts for amps to the house batts
why would you mention Renogly when we are taking about Victron equipment?
DC to DC chargers won't charge to 30 amps at all times, they will vary the amperage rate to 0 amps when the battery is fully charged.
I believe my system will never show 30 amps, because we never have seen 30 AMP charge rate in 2 years even the batteries are low .
we left Quartzite Az after 2 days on batteries and our batteries were topped up in 3 hours with out exceeding 20 amp charge rate.
I only know what I see on our system, other manufacturers may differ so don't confuse the issue.
