Here I go again with some of my crazy ideas. Want to run it by you electrical wizards out there and get some opinions. I have my starting battery seperate from my deep cycle but want the to both charge from the outboard. Linking them in parallel (regular and deep cycle) from what ive gathered isnt advisable for long periods of time. Ive done some minimal research on diodes, but there would still always be current from the starting battery to the deep cycle. Question is: Why couldn't you wire a solenoid to the ignition switch...and when it is in "ON" position, relay energizes and have the positives connected through the solenoid only while the key is on/motor running. That would successfully apply a charge to both batteries then when you're done running, key off, the solenoid opens, and batteries are now seperate once again. The grounds would stay permanently connected. Seems like a simple solution..but never heard of it being done...which is why i'm questioning its feasibility. When yall finish laughing tell me why this wouldnt work.
when the key is on the wire from it to the power pack(s) is basicly floating...there is no voltage present to pick a relay...in addition this wire never should have any voltage present or you will instantly blow the power (pack)s...this wire goes to ground when you turn the key off to kill the engine..the key off position is in parallel with the kill switch...
any rewiring in this area is dangerous and could cost money in short order ....
they sell several different approaches to do what you want to do...the first question i would have is what charging system does your motor have?if it has the rectifier only system then i would be flatly against it...if it has the regulator 35 amp system i still don't like it but you can get something that works...
i do not believe in using any out board engine to charge a dead or low battery...excess current draw equals heat both in the regulator and the stator..neither likes heat...
i like to launch with all batteries fully charged with my ignition battery isolated with a minimum load...just the motor and the bilge pump..the deep cycle battery not hooked up to the charging system at all...if i am running the deep cycle down and need it i would go with the 2nd deep cycle.keep it simple and dont get caught with a dead ignition battery..
all the above is just my opinion but is based on 60 years running a boat..
What I figured...I was wondering i fthe rectifier could handle the load...The motor is a 1985 50HP Evinrude. E50BELCO. Not sure what the charging amps are. I usually run less than 10 minutes at a time but I do a lot of trolling with the deep cycle.
I have a dual bank charger on board. I never leave the driveway without the batteries fully charged. Just a random idea to boost the deep cycle a little during the day while im running all over the place and not have them permanently in parallel. There hasnt been a pressing need for something like that yet...just an idea to keep me on the water longer if the need arose. I appreciate all your inputs and thoughts on it.
