Originally Posted by sailorboy1
the question is: why is the charger voltage different when on shore power versus the Honda.
I don't know as that Honda would provide more than enough to max out almost all battery chargers. And even if it didn't once the state of charge got high enough why would the charger be able to get to the same voltage.
Yes, our honda 2000 supplies more than enough juice for my 70 AMP 12 volt charger. You need to make sure that you turn off eco mode... at least when the charger is putting out its full amps. Not doing so will cause fluctuations in the voltages you get on the charger. In fact, mine won't even charge right with it turned on at the beginning. Once the charger ramps the amps down to around 30 or 40 I can switch on the eco mode.
Also, I'm just going to parrot something I have heard mainesail say over and over... check your connections for corrosion
. Check the shore power cable, the shore power inlet (and clean them), the battery connections, etc...
Its normal for a charging system of any kind to start out putting a ton of amps in and then as the batteries get full see that go down pretty quickly, since as the batteries get charged they accept less current
. For example, on our boat
its normal for me to see both a ramp
down in the amount of amps being put out by the charger at the same time I see less amps going into the batteries - kinda inverse with the voltage going up. So when you say "drops down to a trickle when the batteries reach their max charge." it would be helpful if you mean volts or amps (and exactly how much trickle are we talking about).
The voltage will change depending on what charging stage you are in. For me, I start out at 14.8 volts but I don't see that on my meter right away. It takes a while for the voltage to ramp
up to meet that 14.8 volts. Then, as soon as it sees the batteries hit 14.8 it switches into float mode at 13.2 volts.
I agree you need to solve one issues one at a time by putting the alternator
in a separate category. You will go crazy otherwise. Personally, I have found issues that at first appear to be related have completely different causes and solutions once you break the system down into logical components and look at the issues independently.