Moderated Discussion Areas
ContinuousWave: Small Boat Electrical
Mixing battery types
|Author||Topic: Mixing battery types|
posted 05-03-2006 09:57 PM ET (US)
First, I DID try the search button, but didn't find anything exactly pertaining to my setup...
My 1992 23 Walkaround has two batteries; identical West Marine starting batteries, 1000 CCA, Group 24s, bought new last year. Each cell starts its respective engine (twin Yamahas). In addition, the starboard cell carries all house loads. There is an onboard charger, factory installed, that charges both cells.
While working on the boat this spring, I must have run the starboard cell down, over the course of two days. I was surprised, I guess, that it ran down so fast, as I was mainly listening to the radio, although I did use the cockpit floodlight for a few hours one night.
Seeing as how the starboard cell carries the house loads, should I switch that one out for a dual-purpose or deep cycle type? Any problem mixing battery types on board? What's the highest capacity Group 24 out there?
posted 05-04-2006 10:53 AM ET (US)
Before you buy a new bat, a one year old bat should come back. Leave it on a 40 amp charger for 24 hrs.
Im not an electrician, but, a dual charging system and using aux power off one bat doesnt seem right. You should probably have a pro look it over.
Long as Im here...
Each bat has its own on/off switch & buse bar.
Again, because of your dual charger, I recommend you see a pro before you mix battery sizes.
posted 05-04-2006 12:16 PM ET (US)
Perkos makes a switch called an "emergency parallel" that allows you to isolate the port start battery from the starboard start/house battery. If you have space for it, you can also install a third, house only battery. Basically, you run the engine cables to the starboard battery, then jumpers to house battery, with a Automatic Current Limiter (ACL) on the positive feed from the starboard battery to the house battery. This way, when the starboard start battery is fully charged, the ACL will trip, and begin charging the house battery. The only drawback is that if the house battery runs low, it will not draw from the starboard battery.
posted 05-04-2006 12:22 PM ET (US)
Oops, I meant Automatic Charging Relay (ACR)
posted 05-04-2006 01:23 PM ET (US)
I dont want to debate rathers suggestion, but, as I mentioned, Ive had problems with the isolator systems that I havent had with the simple independent battery setup.
Again, I defer to the new high tech engine specs but 12v is 12v no matter how you try to spin it.
Actually, the independant setup was installed BECAUSE a isolator switch quit working, none was avail so I just separated everything to get going (different boat).
Adding a house battery is great. Using the independant setup, you can install the 3rd battery anywhere and connect to each battery with a simple 3 pole 1/2/off switch.
As long as you are at it, install a volt meter. This time, you can run each bat thru a 3 way switch on/on/on using small gauge wires. Whenever you read 12v or less, its time to start an engine to charge.
Use 6 gauge soldered lugs on the primary ground loops.
posted 05-04-2006 04:28 PM ET (US)
Pat, check out the reference section under "Dual battery", then go down to the "New dual battery configuration", that is a nice setup and I am an electrician! The wiring setup, I'm referring to allows you to select which battery the house loads are put on , plus it also allows you to tie the battery systems together in a low battery sitaution. You can get higher then 1000CCA but a dual use battery will probably be fine, as long as you stay with the same type of lead acid battery , not going to optima or AGM. Unless you plan on draining down the batteries a lot , I would charge it up and not worry about it. My 1987 Yamaha engines seem to run a little hot on voltage up to almost 15 volts, the AGM batteries at Cabela's have a sticker that says using in a system that allows over 14 volts voids warranty. You have a twin engine setup , keep it separate and keep it simple! I replaced both batteries last year and went with dual use batteries, but I'm cranking twin 70 hp engines......Jack
posted 05-04-2006 09:02 PM ET (US)
posted 05-04-2006 10:10 PM ET (US)
Thanks for all the tips. I had forgotten about the Reference section. Nice work on that article, jimh.
I am going to hand-over-hand my system, as it kind of looks like the factory scheme shown in the Reference article. I like the idea of the "new" system in it's simplicity though.
Thanks once again everyone. Pat h
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.