12V to 12V charger...... - Page 2 - Ford Transit USA Forum
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post #11 of 29 (permalink) Old 12-01-2016, 07:41:AM
klp
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Thanks for the clarification, this is a new area of research for me. I didn't even know 12v chargers exist but this would fit my design perfectly. I want to run all 12v, no 110 at all.

Love the forums.

Now, about that $ of the Sterlings...

Yikes.
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post #12 of 29 (permalink) Old 12-01-2016, 08:56:AM
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75 dollars less on Amazon then the manufacturer for the one i bought. https://www.amazon.com/Sterling-Batt...attery+charger

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post #13 of 29 (permalink) Old 12-01-2016, 09:13:AM
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Sterling (Bay Marine Supply) sometimes comments and answers questions on our transit forum: (search box) Separating Dual Batteries

2016 transit cargo 250 MR, LWB, 3.5 eco, 3.31 limited slip
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post #14 of 29 (permalink) Old 12-01-2016, 09:49:AM
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Originally Posted by klp View Post
It doesn't seem any of these charge Lithium Ion batteries.
I purchased (but haven't yet received) a 200aH Victron Lithium battery from AmSolar. This was after several back and forth email exchanges with the owner. I began by asking him if I would have any issues relying on the Sterling batt-to-batt charger offered by Sterling. He responded with puzzlement about why would I need the Sterling. He asserts that with their battery system it is unnecessary. Following are a collection of his responses to questions I kept after him with regard to protection for the alternator, and what at the time I thought might be necessary staging for the LiFePO's.

* * *


That is true with*most simple lithium systems like our Generation 1 system, but the BMS 12|200 in our Victron lithium systems reformats incoming power and turns it into something that can safely be fed to the battery.* No additional systems are needed.


* * *


Fortunately the BMS 12|200 makes it much more simple than that.* The alternator negative connects to the CHASSIS terminal of the BMS and the alternator positive connects to the positive terminal of the Lithium battery. The BMS regulates incoming current keeping it under 80A. The BMS takes whatever voltage the alternator gives and doesn’t backfeed to the alternator. When the lithium battery is full, the BMS disconnects it from the battery leaving the alternator to charge just the starter battery.* Does this make it more clear?


* * *


Just run a cable from either the alternator or the starter battery positive to the positive of the lithium battery.* The negative is tied to the chassis, so you can just connect the CHASSIS post of the BMS 12|200 to your vehicle chassis.

The lithium batteries are normally topped off at 14.2V. But that doesn’t mean anywhere between13.7-14.1V won’t work. They are very different than lead-acid batteries in that regard.
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post #15 of 29 (permalink) Old 12-01-2016, 10:39:AM
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I purchased (but haven't yet received) a 200aH Victron Lithium battery from AmSolar. This was after several back and forth email exchanges with the owner. I began by asking him if I would have any issues relying on the Sterling batt-to-batt charger offered by Sterling. He responded with puzzlement about why would I need the Sterling. He asserts that with their battery system it is unnecessary ...

the BMS 12|200 in our Victron lithium systems reformats incoming power and turns it into something that can safely be fed to the battery.* No additional systems are needed ...
This looks interesting. I do believe that Lithium batteries are simpler to charge and use than AGMs, as long as the Lithiums are not overcharged or over discharged (which the battery management system should take care of).

Do you plan to hook up directly to the alternator or to the van's starter battery?

Will you be installing a meter to monitor the state of charge?

Terry
Nova Scotia, Canada

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post #16 of 29 (permalink) Old 12-01-2016, 12:22:PM
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Starter battery and meter yes. Also a temperature protection device.
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post #17 of 29 (permalink) Old 12-01-2016, 01:55:PM
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That Victron BMS 12/200 looks very interesting. Do you know if it can be used with any lithium ion battery or does it require the Victron batteries?
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post #18 of 29 (permalink) Old 12-01-2016, 05:09:PM
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That Victron BMS 12/200 looks very interesting. Do you know if it can be used with any lithium ion battery or does it require the Victron batteries?
I don't know. I'm still a babe in the woods on this whole matter.

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post #19 of 29 (permalink) Old 12-01-2016, 08:06:PM
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Dammit! Here I was starting to learn and now I am back at ground zero.

I was thinking Lithium Ion, shunt to measure capacity, 12v to 12v charger and a battery isolator. According to the Victron rep I only need some thick gauge wire to run to the alternator direct? That would save some $ for sure. I am not confident he is addressing the smart charge format of our vans. From what I have read the alternator puts out very little until braking, when it spikes to a much bigger voltage. Without those numbers I am not sure I trust the battery rep's response entirely.
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post #20 of 29 (permalink) Old 12-01-2016, 08:20:PM
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Dammit! Here I was starting to learn and now I am back at ground zero.

I was thinking Lithium Ion, shunt to measure capacity, 12v to 12v charger and a battery isolator. According to the Victron rep I only need some thick gauge wire to run to the alternator direct? That would save some $ for sure. I am not confident he is addressing the smart charge format of our vans. From what I have read the alternator puts out very little until braking, when it spikes to a much bigger voltage. Without those numbers I am not sure I trust the battery rep's response entirely.
Here's what my guy said:

The positive from the alternator doesn’t go to the BMS, it goes to the positive terminal of the lithium battery.* The negative from the alternator goes to the BMS in order to make a loop.*
*
The positive of the alternator also goes directly to the starter battery.* That doesn’t change.
*
There is no current requirement when charging batteries.* More current charges them faster, less current charges them slower.

Charging the lithium at the same time as the starter battery is not a problem.* The starter battery will get all the current it needs and the lithium system will get up to 80A.

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