How much converter/charger is really needed?
I have a pair of NAPA 9824M Marine/RV batteries with a 20 hr rating of 79AH each, wired in parallel. Is there, really, any advantage in going from a 45 amp (PD4645V) converter/charger to a 55 amp (...
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My ugly graph says that on a 220AH bank starting at 50%, the time difference is about 18 minutes from 50-75% and it is the same times after 75%
So you will save about 18 minutes of gen time doing a 50-80 or 50-90 (75-100 same times, so no advantage past 75% SOC.) by choosing a 60 over a 45 on 220AH.
Whether there is any point in saving that 18 minutes of gen time each time you do a 50-90 depends on how often you do it in a year, how much gasoline costs, what the gen hours are at the campground, how hard is it to get more gas, etc.
Not answered by the OP is the post in another thread where he said he can't get through one night with his current battery bank with the furnace running at a decent temperature, so they freeze under many blankets. the usual rule is one night per battery and he has two.
So that must mean his batteries are already shot, and need replacing now unless he is not going off grid for a while.
So you will save about 18 minutes of gen time doing a 50-80 or 50-90 (75-100 same times, so no advantage past 75% SOC.) by choosing a 60 over a 45 on 220AH.
Whether there is any point in saving that 18 minutes of gen time each time you do a 50-90 depends on how often you do it in a year, how much gasoline costs, what the gen hours are at the campground, how hard is it to get more gas, etc.
Not answered by the OP is the post in another thread where he said he can't get through one night with his current battery bank with the furnace running at a decent temperature, so they freeze under many blankets. the usual rule is one night per battery and he has two.
So that must mean his batteries are already shot, and need replacing now unless he is not going off grid for a while.
