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TOPIC: Attaching a new battery to the existing two on board for inverter

Attaching a new battery to the existing two on board for inverter 28 Jul 2017 03:57 #1

  • dockofthebay
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Hey every one, I do not have alternating current on my Wellcraft Antigua. I do have a 2000 watt inverter that I got for just that purpose so I don't need a reeeeaaaaally long extension cord to the marina. I also have a new side and top post marine battery that I want to use specifically for the inverter. What would be the proper way to connect it to another battery on the boat and then to the inverter? I'd like the alternator to charge it as well. Both batteries operate all powered aspects of the boat. It does not appear to be one battery for cabin/accessories and one for motor. Can any one offer suggestions?

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1994 Bayliner Capri 1850, 3 liter Mercruiser, 9.9 Johnson kicker.
1987 Wellcraft Antigua 265, Mercruiser 383 Stroker V8.
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Attaching a new battery to the existing two on board for inverter 28 Jul 2017 05:00 #2

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Sounds like you're going 12 volt battery. I would suggest ditching 2 of the 12's and getting a pair of 6V GC batteries wired in series. You will have more amp capacity,and true deep cycle ability. Then use the 1 12V for the engine starting battery.
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Attaching a new battery to the existing two on board for inverter 28 Jul 2017 12:31 #3

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dockofthebay wrote: ...................................................
I also have a new side and top post marine battery that I want to use specifically for the inverter.
Please note that the so called Marine Battery is typically not a true Deep Cycle Battery.
Also note that inverters are Amp Hour Hungry...... and are rather inefficient at producing 110 vac from a 12 vdc source.

Your Inverter use will fare much better if powered with a bank of Deep Cycle batteries.


What would be the proper way to connect it to another battery on the boat and then to the inverter?
OK..... this would essentially be your HLBB (house load batt bank).
Battery banks should be of "like" batteries, meaning the same brand, same age, same group #, same AH rating, etc.
If you have two "like" 12 volt batteries, they would be cabled in Parallel with each other.
If your Inverter is a Marine Inverter, the Positive and Negative cables will connect to this battery bank.
The Positive cable will be interrupted with an appropriate fuse!



I'd like the alternator to charge it as well. Both batteries operate all powered aspects of the boat.
Yes..... that is very standard with a typical MBSS (main battery selector switch).
Regardless of which bank is "selected", that battery bank will power all 12 vdc loads.... and it will receive the alternator charge rate.

However, as noted, the Inverter will make a direct HLBB connection...... fused at the Positive cable side. So, in other words, you will not have the ability to change the 12 vdc source for the inverter.


It does not appear to be one battery for cabin/accessories and one for motor.
Correct. With exception to the inverter's power source....., your MBSS allows you to chose the appropriate battery bank for the load.

Can any one offer suggestions?
Replace your single HLBB with multiple 6 volt Deep Cycle batteries cabled in "Series".

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Attaching a new battery to the existing two on board for inverter 28 Jul 2017 14:30 #4

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Hey Bounty, so is there a more appropriate way to set it up so that the alternator charges that extra battery?

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1987 Wellcraft Antigua 265, Mercruiser 383 Stroker V8.
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Attaching a new battery to the existing two on board for inverter 28 Jul 2017 14:36 #5

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That makes more sense to run 12 volts in parallel. Same voltage but double that amp hour capacity, correct?

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1994 Bayliner Capri 1850, 3 liter Mercruiser, 9.9 Johnson kicker.
1987 Wellcraft Antigua 265, Mercruiser 383 Stroker V8.
Pulls with Ext. Cab 2006 GMC Sierra 2500 HD
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Attaching a new battery to the existing two on board for inverter 28 Jul 2017 23:08 #6

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dockofthebay wrote: Hey Bounty, so is there a more appropriate way to set it up so that the alternator charges that extra battery?


I would think of this as though there is no "extra" battery.

Your boat will be set up with two totally separate battery banks.
#1 bank will be your starting battery bank.
#2 bank will be your HLBB ( House load battery bank ).

The engine alternator will charge which ever bank is being selected at the time, and during engine operation.

.

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Attaching a new battery to the existing two on board for inverter 28 Jul 2017 23:14 #7

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dockofthebay wrote: That makes more sense to run 12 volts in parallel. Same voltage but double that amp hour capacity, correct?


At first glance, it sounds as though it would be correct! However, when comparing batteries of the same approximate size, a 6 volt GC battery will offer more amp hours than two 12 V batteries will.
Plus...... the 6 volt GC battery is a true Deep Cycle battery.


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Rick E. Portland, Oregon
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Attaching a new battery to the existing two on board for inverter 29 Jul 2017 00:58 #8

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Gentleman I have so much to learn. Thank you. I am back to the drawing board then. No rush. Right now the AC current works fine in a marina ac outlet. The biggest concern was running the air conditioning in the boat while we were out on the lake for the family. In the mean time I just got done spending 2 hours running wires to figure out why my horn wont work.

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1994 Bayliner Capri 1850, 3 liter Mercruiser, 9.9 Johnson kicker.
1987 Wellcraft Antigua 265, Mercruiser 383 Stroker V8.
Pulls with Ext. Cab 2006 GMC Sierra 2500 HD

Attaching a new battery to the existing two on board for inverter 29 Jul 2017 09:26 #9

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I just switched from 2 banks of 27 series lead acid batteries to 2 banks of 31 series AGM, also 1 spare 31 series AGM under the master bed in the bow as an emergency spare, I will add 1 more AGM next year fwd on my 3870, helps keep the bow down, I have gas engines, also an inverter I rarely use. Sams has the 31 series AGM batteries for $180.00

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Attaching a new battery to the existing two on board for inverter 31 Jul 2017 14:44 #10

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There is absolutely no way an invertor and battery will run an a/c unit out on the water! Depending on the size of the A/C unit it will take about 30 amps to start (instant kick) then about 10 amps to run. A 15 amp shore power circuit can take the start kick. A 2000watt invertor..I'm not so sure. 10amps X 120 volts is 1200 watts. Running on 12v that is 100 amps if the system were 100% efficient (which it is not). With a 200 A/H battery you may get one hour or so running of the A/C. Remember that 200 AH rating is at 20 amps. At 100 amps it's just a guess but if you discharge the batteries fully the life will be very limited! In my opinion to run A/C while on the water you need a generator.

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Attaching a new battery to the existing two on board for inverter 31 Jul 2017 15:13 #11

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Thank you for the input. I wasn't 100% sure on how all of that worked anyway.

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1994 Bayliner Capri 1850, 3 liter Mercruiser, 9.9 Johnson kicker.
1987 Wellcraft Antigua 265, Mercruiser 383 Stroker V8.
Pulls with Ext. Cab 2006 GMC Sierra 2500 HD
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