My alternator is only putting about 12.5 v. It took 25 hours of using the engine in my way from Georgia to Miami to bring it to 14.0.
This could have a few causes.
#1 Poor factory wiring in alternator system leading to voltage drop. Could be bad connections, undersized wire or bad case ground on the alt.
#2 Diode isolators in system
#3 A bad diode in the alt giving you 1/3 or 2/3 the output.
To test this the alternator needs to be measured across the B+ terminal and ground. You then test the voltage at the battery bank. If the voltage at the back of the alternator is not within +/- .1V of the voltage at the battery bank then you have a voltage drop issue and this will drastically SLOW your charging. With bad enough voltage drop it can take 25+ hours to charge a bank and the voltage won't get to 14+ until the current is very low..
I have 2 banks of batteries. I have three Seavolt AGM's, one group 24 and two size 8D. I am totally ignorant about the boat electrical system, but I know that not being able to hook up to shore power, will eventually discharge my batteries.
As others have mentioned you'll want to invest in solar. You can't keep AGM batteries sufficiently charged with an alternator.
I have a new Honda EU1000i generator and I was wondering how to charge at least my starting battery. I do not know which battery is the starting battery, but I am assuming is the group 24. Do I connect the generator directly to the battery or do I use a a battery charger connected to the generator.
Battery charger connected to the generator.
The boat has a Xentrex Freedom HF 1800 inverter/charger. Do I turn it off when I connect the generator to the battery.
No, you want to use that to charge the batteries. You may need to go into the set up and see if you can limit the current output so you don't overload the EU1000..
I also would like some suggestions as to some basic boat electrical system books.
Charlie Wings book is one of the best. Easier for a novice to understand than Calder.. It's called "Boatowners Illustrated Electrical Handbook Second Eddition"..