Two Batteries idea - Steve Saunders Goldwing Forums

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post #1 of 8 (permalink) Old 07-14-2019, 12:42 AM Thread Starter
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Two Batteries idea

Looking around in basement, looking for a chainsaw I misplaced, found a like new Odyssey PC680 battery bought less than a month after I bought the one that is in our 1997 GL1500 Trike. I had almost forgotten it, I had bought it for a bike that I no longer own, so I got to thinking, build a light weight box and put it in the trunk, place it on a disconnect, and wire it with same type ring terminals. Run POS side straight to terminal on solenoid as OEM, only use it's own ring terminal. Wire NEG side to a battery disconnect that is handy, then to good ground. Comp-u-Fire would easily charge both if left connected.


It'll do me more good having it if needed than sitting on a shelf gathering dust. The PC680 is not heavy, it is AGM, and this is the same trike that lived off a single PC680 from 2004 until 2016 . and that one left here with the bike. Be like carrying my own jump.


PS, I found my chainsaw I was looking for too! Don't know why I stashed it there where I found it though.
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post #2 of 8 (permalink) Old 07-14-2019, 02:45 AM
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The problem with that setup is that the second battery will only charge if your isolation switch is closed. So you would need to remember to close it every time you want to charge the battery, and open it before doing something that would run the battery(s) down. Instead, place a suitable diode across your isolation switch so the battery will charge with the switch open, but can't be drained unless the switch is closed. Be aware that your switch will need to handle the full starting current, so you might want to use a solenoid for that instead.

A similar system is often installed on limos so they can still be started if the main battery is drained running accessories with the engine off. Some are fully automatic, you just turn the key, while others require you push a button to "give yourself a jump".

(This might be a little easier if done on the positive side as there are commercial battery isolators for that side, with current limiting for protection.)
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post #3 of 8 (permalink) Old 07-14-2019, 03:17 AM
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I don't view that as a problem at all.
Once the AGM battery is charged, it will maintain that charge for a year or more, w/o any supplemental charge. Providing of course, that a switching method is used to disconnect it from the other stuff. like the schematic above.

the AGM on my Auxiliary Generator only gets charged when the generator is running, supplying a/c to my house.

yet, that battery has always measured ~12.6 volts every time I put a VM on it.

and, even when the generator had not been used for 2.5 years, and we had a power failure, the starter whirled over the engine at the usual quick speed, and the generator's engine started up in about 5 seconds.
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post #4 of 8 (permalink) Old 07-14-2019, 08:56 AM
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Used a Balmar Digital Duo Charge unit when I was boating. Would work for this application as well, bit pricey, but a good unit. Here's the site: http://www.balmar.net/products/digital-duo-charge/

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post #5 of 8 (permalink) Old 07-14-2019, 01:43 PM Thread Starter
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Thanks for the input guys!

Yes, the PC680 I found was last charged (if ever since I got it winter of 2015) long enough ago that I forgot where I had put it, but is at 12.62 volts still. My box for it (I still have boxes for both) has my note showing 12.84 volts when received.

I think I probably did charge it along with my backup generator's new AGM and the new PC680 from trike and the older but still kicking 2004 vintage PC680 back this past winter with my 2-6-10 amp charger / maintainer that has AGM mode too.

It's just "a thought", not ever seen sign of need unless a problem developed on the road. I think I'd remember to open / close connector. I considered putting it in the trailer, but I seldom pull it. Doing this would be more for piece of mind, and trike has plenty room for it.

As to the switch or disconnect device, I was planning to use one of the kind with a knob you screw down on to make connection, when loosened it disconnects. It's rated 80 amps.

I have one "lock box" in the lower trunk for which to lock my friend in if I leave it in the trunk, but I never do leave it. A battery box for this extra AGM battery would fit nicely in there in place of.



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post #6 of 8 (permalink) Old 08-21-2019, 05:12 PM Thread Starter
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Well, I can't decide (but I will soon)

1) do I build and install a dedicated "box" that's 7.125" long X 3.000" wide X 6.750 or 7.000" tall inside (room needed for PC-680) and fasten it in place
or
2) do I simply add a strap inside the lower trunk to secure it in place, and cover the terminals (especially that pos. terminal) with a piece of rubber sheet under the strap?

I know I can lay the PC680 down if I like (it is a AGM battery), the switch in my above post will simply be installed "in line" and I can make the cables as long or short as needed. The more I look in the trunk, with my lock box on the right and the owners book & tool kit simply strapped on the left side, both at front of trunk, the more I favor #2). The strap idea will work, using a 1" wide nylon type strap and would hold the battery upright against the front wall of the trunk, away from the "door" at rear. It would also allow me to move the battery a bit if needed for odd reasons (like simply to access those (-) & (+) screw terminals). Of course, I'd need to use well insulated cabling. This way, the whole rear of trunk stays accessible, things like my camera bag or overnight bags would be easy to insert.

Again, my only reason for the second battery idea is simply because I have it and to simply leave it on a shelf seems "wasteful" to me. I don't need another portable power source, I have two still good / used group 65 batteries in a cart I built years ago, they are rated @ like 850 CCA each. I charge them occasionally. If I need a boost or power, they are ready.

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post #7 of 8 (permalink) Old 08-21-2019, 06:21 PM
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Those screw knob disconnects are great. We have two in the '63 Nova I helped build. They handle way more than 80 amps intermittently. Why not just hook it up and leave it alone? The disconnect is nice to have to be able to charge one battery at a time if needed, but there shouldn't be any real need to ever disconnect the battery.
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post #8 of 8 (permalink) Old 08-21-2019, 10:16 PM Thread Starter
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Well, the ones I have acquired (2) are smaller than those used on cars, for example the holes are suited to 6mm or 1/4" screws or bolts. I may put one to each battery, so I can easily disconnect all battery juice if it's gonna be off road for awhile, like winter, but easy to fire up.


I have also used the bigger ones on cars, they do work well.

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