Recharging AC with 2 evaporators? - Page 2 - Nissan Versa Forums
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post #11 of 14 Old 08-22-2017, 10:41 PM
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You may be stepping into no-man's land there, it depends on how the alt charges. I work on Fords and the ECM or PCM or whatever, controls the alt charging by direct input into the alt, if you have one of that type control you can't just get a standalone alt as it will shoot codes all over the place. The Ford guys do have someone that makes special alts just for that thinking but $$$$$$$$$$$$$.

Obviously can't see it but I feel you have something electrically wrong with the van. Besides that, the 130 amp alts the Fords use do not charge as fast as you seem to need, they take 8 full hours to recharge a known good battery run fully down as certified by Ford itself in testing. Short story.............NO alt can charge that fast, it burns out the alts and what the Ford ones do like others. Modern high amp alts put out whopping amounts of power but it is only intended for a short period ONLY, pushing them past that fails them from overheating as NO WAY were they built to make that 130 all day long, only long enough to quickly fill battery back up then it gets a rest by trickling and normal for all alts on cars.

Pretty much all new alt paperwork says you void the warranty when you load one that hard, i.e., charging at 100% all the time, they simply will not last and the rebuilders tell you so. The number was intended to be the highest number and rarely used and not the normal output all the time, it's been that way since the '50s. You even void the warranty if you admit you tried to crank car up with new alt but dead battery, it can fail the alt in minutes, the paperwork clearly states the battery must be already fully charged when you first crank back up. That's for a reason, I cannot count the number of failed new alts people came back with for a refund doing that, and asking them they tell you and bam!, no warranty on part. We'll happily sell you another one though. Similar to how people butcher brand new fuel pumps in the same stupid ways.

Reason I say something wrong with van (or in the use of it) is that others do exactly what you do and all day long, there's something different there. Maybe go to the city and dig up whoever runs the wheelchair stuff for invalids and talk to some mechs...........or maybe even search the web for them.

One thing I know. If running the chair batteries enough to kill them then when parking vehicle I'd be charging from the house not the van. You're thinking you can power van up like a house and that simply won't work, the reservoir of power is simply too small.
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post #12 of 14 Old 08-23-2017, 12:53 AM Thread Starter
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Well..... I was looking at a 170 amp or so aftermarket one. I understand from reading the oddy forum its not uncommon for an alt to go bad at 54 thousand miles. Ive never had an alt go bad on me, but lots of batteries. Usually the first hot or cold day it fails to start and need a jump.

I got a battery doctor, some 4 gauge wire, fuses and a second battery kit. Thats why in another thread I wondered if instead of going for a bigger battery I should go for agm and a smaller size so it charges faster so I get operating voltage soon.
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post #13 of 14 Old 08-24-2017, 03:46 AM
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The ONLY thing an AGM battery does better than a normal battery is hold up under vibration. Anything that charges faster of course will run down faster, think of the battery as a cup of water. A big one vs. a small one.

Alts go bad when they go bad, some designs are better than others in that respect. Past that it is luck of the draw.
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post #14 of 14 Old 08-26-2017, 12:01 AM Thread Starter
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Err, the draw is like 10 ma. Well, like mentioned in another thread I got a flexible solar panel thats rated at 100 watts and a solar pwm charge controller to wire up to the vehicle. I may add 2 more panels for a total of 3. Then 2 same size agm batteries and the battery doc and likely a manual cut off switch you stick a key in and twist it.

See, the van is for driving around my disabled mother. She likes me to drive her around. I want it to be turn key ready for anyone to drive her as to why I want someone to be able to operate it like a regular van vs having to precharge it, forget to unplug it or turn a cut off switch, etc, etc, etc.

[QUOTE=amc49;267993]The ONLY thing an AGM battery does better than a normal battery is hold up under vibration. Anything that charges faster of course will run down faster, think of the battery as a cup of water. A big one vs. a small one./QUOTE]
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