will DF70 charge 2 batteries?

[rhino_160]

Hey all,
I am wanting to install a second battery on my Toon but I wanting the engine to charge both batteries while running down the lake. I am assuming I will have to install a battery selector switch and would like to have one battery for the motor and 2nd for the accessories. My question is:
1) How can I hook these batteries up so the motor will charge them both, or will it??
2.)Is it possible to have the motor/acc hooked to both batteries so if one did go dead, i could still use the accessories on the 2nd battery?
2010 Manitou Oasis 22'
2011 Suzuki DF70 Fuel Injected

 

[stylesabu]

Re: will DF70 charge 2 batteries?

go to electrical section to find more detail. it can be done with battery isolater and and battery switch

 

[Silvertip]

Re: will DF70 charge 2 batteries?

The alternator output of your DF70 is 25 amps. While not considered "high output" it is sufficient to charge two batteries. BUT -- the real issue is what accessories does the boat have and how deeply discharged do the batteries get. Keep in mind that just because the engine can charge a battery, how long it takes to do so depends on the load the battery must support. If you are not having any issues now with a single battery, there is really no need for a second battery and its associated wiring. But if you really feel the need for a second battery. then either a dual battery switch or an ACR (Automatic Charge Relay) will work. I can tell by your question that a dual battery switch probably is not the answer since many folks cannot seem to get a grip on when the BAT 1, BOTH, BAT 2 positions of the switch are used. An ACR on the other hand is automatic so both batteries charged when the motor is running, but they are isolated from each other when the engine is turned off. You lose the flexibility of the switch with an ACR but it is a no fuss answer for many folks. A switch on the other hand provides the following"

OFF: Disconnects both batteries to prevent discharge when the boat is unattended.
BAT 1: When ALL loads (engine AND accessories) are connected to the COM terminal on the switch, BAT 1 operates the engine and all accessories and BAT 1 is charged when running. BAT 2 is isolated and not being charged.
BOTH: Both batteries are charged, both batteries start the engine, and both batteries operate all accessories.
BAT 2: Same as BAT 1 except BAT 2 powers everything.

Keep in mind that a short run back to the dock is not going to add a significant charge to any battery. You would need to run wide open for hours to fully charge a deeply discharged battery. Below is the typical dual battery switch wiring. Remember, ALL loads (engine and accessories) connect to the COM terminal on the switch. The switch then becomes the traffic cop to steer current where you want it to come from or go to. If all of this confuses you then a simple, portable jump start pack may be all you need if starting the engine is the only issue you concerned about.