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post #1 of 5 Old 07-20-2017, 05:27 AM Thread Starter
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Question Smaller AGM battery solution for power issues?

My other car is a 2008 honda odyssey exl res. Unlike most vans its made to handle 4 disabled people in wheelchairs. I currently have the front seats installed, but no second row. Its my mothers car and driven on the weekends. I have learned to plug in the trickle charger 2 days before it needs to be driven for it all to work. The van only needs 9 volts to start and run, but the wheelchair computer and parts needs 12.

The alt and everything is fine except the bat is always short or needs charging. At first the van just works, but after driving it some the wheelchair stuff comes to life.

So, been thinking that a bigger battery isnt the solution, but maybe a smaller one that can be recharged faster? Ive been told when amp need exceeds supply voltage does down. When amps are restored voltage goes back up.

So, if I exchange the group 34 battery I have for an odyssey, XS audio agm bat or even a bat cap it will charge up in no time and I will have the voltage for the disability stuff. I got a 200 amp alt and its working ok.

Plan B was to use a large solar trickle charge of at least 100 watts with controller. Plan C is to mount s trailer hitch, cargo tray, gas powered generator with a large 50 amp battery charger/starter/jumper dealie so I can throw more power at the situation. Plan D was to use a second bat and isolator, but its suspected the wheelchair stuff is what lowers the charge til its too low to function. This kind of defeats the ability of a disabled person to be independent unless they move to a remote starter and use a circuit off that to trigger the mechanical isolator to power up the disability stuff from the second battery.

Yeah, life sucks.....
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post #2 of 5 Old 07-20-2017, 04:06 PM
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#1 a week of non-use should not kill a battery, how old is it? It may be time to replace anyway.
#2 have you checked for a parasitic drain?

I would go with the solar charger as plan 1 if the battery is not old.
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post #3 of 5 Old 07-21-2017, 02:41 AM
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X2, your battery is old and dropping CCA at end of life (internal slow bleed off due to sulfation) and they all do it. Or a voltage leak while van sits.

This sentence below is just plain wrong-where do you get these crazy ideas???? And your very next sentence after it tears that idea all to h-ll.

'So, been thinking that a bigger battery isnt the solution, but maybe a smaller one that can be recharged faster?'

Exactly the opposite, the bigger battery needs less charging as it has more power to give away before it's needed.

And you are in dreamworld thinking that van runs fine all day long on 9 volts. If I was there in person I'd be faulting that in about 15 seconds.
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post #4 of 5 Old 07-22-2017, 01:48 AM Thread Starter
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The battery in the van was new, but I replaced it anyways with one a tad bit larger and made several return trips to advance auto. It had an interstate megatron 800 cca and I went to a group 34 800 cca one from advance. They say its undercharge when I visit and have problems. Ive put it on a battery charger several times, but I got a parasitic drain I cant fix. The van has a one button program for a disabled person to enter or exit the vehicle. THe manufacture said to drive the van 3 days a week or install a trickle charger.

Driving it helps and a trickle charger helps if I got a 2 day advance notice I need to use it.

So, just thought Id pick the brains of the other car guys here about it. Its a VMI conversion on a 2008 honda odyssey exl.

https://www.vantagemobility.com/

How It's Built - VMI Wheelchair Van - YouTube
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post #5 of 5 Old 07-30-2017, 02:52 AM Thread Starter
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So, throwing some money at it. Got a battery doctor 150 amp isolator. Alt is 130 amps. Ordering reman alt from rockauto and got an xs power xp 750 supplemental battery kit.

Got a 70 amp charge controller from harbor freight and a folding 100 watt solar panel to put in the windshield like a windshield solar shield when you park your car. Got 2 flexible ones on order to stick on the roof with 3m double sided tape.

So the xs power kit comes with cable, fuse holders, battery holder, small agm battery. Mounting that in the rear where the emergency power battery is, but it does not work. Mounting the solar charge controller near it so its out of the weather and direct sun light. Got a second smaller 40 amp charge controller going to use up front with the folding panel. Think 12 amps or so maybe too much to back feed through the odb2 port like the battery tender adapter does, so may run a wire through the firewall.
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