what if you only had a 150A alternator? - Ford Transit USA Forum
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post #1 of 7 (permalink) Old 10-29-2015, 02:47:PM Thread Starter
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what if you only had a 150A alternator?

how would the electrical system on your conversion have been affected? what things would you have to do differently if you didn't have that extra 70A capacity from the HD alternator?

i'm going to try calling ford to see if an after-the-fact alternator is possible on a used van. (i tried the local dealer's parts desk -- that was predictably unproductive). but i figure i should also start figuring out whether the 150A unit might be a deal breaker if it can't be swapped out.

paul

Silver 2016 high roof cargo van, 3.5l Ego-boost, 3.31LSD. HD alt, dual batteries, power seats, and the coveted chrome grill.
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post #2 of 7 (permalink) Old 10-29-2015, 04:03:PM
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I recall looking at the BEMM section on alternators, and it only recommended the 220a for continuous operation of aux equipment at engine run. Seemed to me at the time that the 150a would actually do a decent job.

I ordered the 220 anyway to ensure max recharge capability for my 3 AGM system. I suspect the standard would have been fine.
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post #3 of 7 (permalink) Old 10-29-2015, 04:10:PM
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I think 150A is plenty for most users.
It wasn't but a few years ago even 100A was considered the large optional alternator on many vehicles

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post #4 of 7 (permalink) Old 10-29-2015, 04:22:PM
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I wouldn't change mine either. It might not charge as fast and maybe my house batteries would not be optimal as much. But nothing would "not work" because of the smaller alternator. I can only send 100 amps to the house batteries anyway...

2015 Transit Wagon 350 XLT, 3.5 Ecoboost, 3.31 limited slip, Medium height, Medium length, Tow package, dual batteries, 110 vlt, SYNC with CD, ...

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post #5 of 7 (permalink) Old 10-29-2015, 04:38:PM
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I've only got a 150A alternator but I have one of these to charge while driving. http://sterling-power.com/collection...20a-waterproof
At idle it puts out around 80A to the batteries....I haven't had a chance to test it while driving yet. If it puts out at least a 100A I will be happy, its rated for 120A so we will see.
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post #6 of 7 (permalink) Old 10-31-2015, 02:58:PM
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I have a 2015 Transit with the 150 alternator. I use the dual inverter system that Orton talks about to keep the van and house electrical systems essentially separate. I use the van electrical system to power a 600 watt full sign wave inverter. This in turn powers a 7 amp battery charger to re-charge my house battery and also powers a small 120vac dorm sized refrigerator while driving.

I fused the 600 watt inverter DC input at 50 amps and power it off the 12v 60 amp accessory feed on the driver's seat pedestal. So far the fuse has not blown although we did overload the inverter a couple of times by plugging in additional loads, no harm, it just needed to have the load reduced and be reset.

I chose the 600 watt inverter because it was the largest that I felt I could safely power off the 150 amp alternator and the 60 amp accessory feed. I do not want to risk harming the van's electrical system. I bought my van out of dealer stock so I could not pick and choose options. If I were to order one I would absolutely opt for the 230 amp alternator and the dual battery set up, this would let you run a much larger inverter and depending on your needs might actually eliminate the need for a separate house electrical system.
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post #7 of 7 (permalink) Old 11-01-2015, 08:02:AM Thread Starter
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Originally Posted by Beridian View Post
If I were to order one I would absolutely opt for the 230 amp alternator and the dual battery set up, this would let you run a much larger inverter and depending on your needs might actually eliminate the need for a separate house electrical system.
thanks! in the end we decided to buy a new van rather than the used one we were looking at -- and we'll be getting the big alternator. i saw your post while sitting in the dealership waiting to sign the papers -- it was a nice affirmation of our decision. :-) it's clear that the 150A alternator would work, and it's also clear that the extra headroom of the 220A version will likely be useful.

paul

Silver 2016 high roof cargo van, 3.5l Ego-boost, 3.31LSD. HD alt, dual batteries, power seats, and the coveted chrome grill.
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