Outboard motor battery charger control
rporter Registered Users Posts: 8 ✭✭
The motor is a 6hp Tohatsu with what they refer to as an 6amp 'alternator' but in reality it's a magneto coil and rectifier. The battery is a 12v approx. 75ah deep cycle battery. I've tested the output and the rectifier correctly limits the voltage output to around 14v as the engine speed increases.
This is on a sailboat. The problem is if I motor for several hours or all day, there is nothing limiting the amps being pumped into the battery. It's all about a year old and I'm afraid I have already started to damage the battery.
The boat also has a 100w solar panel that is connected to a Morningstar SunSaver controller. Typically not connected when the motor is on. That works fine at controlling the charge from the panel. I contacted Morningstar to see if the outboard charger could be connected to the SunSaver to control the charging and was told definitely not. The two systems can be connected in parallel after the charger but not before.
I have looked quite a bit and have not found any small device that will act as a controller to cut the charging from the outboard when the battery is fully charged.
Any help or suggestions will be appreciated.