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1. 03:06 PM - Re: Re: Excessive Amperage (skywagon185guy)
2. 03:07 PM - Re: Excessive Amperage (user9253)
Message 1
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| Subject: | Re: Excessive Amperage |
Paul,
Check out the various YouTube videos that deal with RV travel with the
solar market.
Many have converted to lithium batteries for their solar storage and great
power capacity.
They have the same problem, namely stock alternators burning up trying to
supply max amperage at idle speeds.
Resulting in too little air cooling.
Companies like Victron, Renegy, etc., etc., make "Charge controllers" to
safeguard the alternators from overheating.
On Fri, Jul 7, 2023 at 2:49=AFPM Paul Eckenroth <N509RV@eckenroth.com
> wrote:
> David
> You refer to gizmos made to take control of the charge rate such that it
> stays under the alternators design limits. Can you be more specific as t
o
> what these gizmos are. I have been looking for something like this to tr
y
> and keep the stator in my Revmaster engine from burning up again. I
> believe that controlling the output is the key.
> Thanks
> Paul
>
> On Sun, Jul 2, 2023 at 2:19=AFPM skywagon185guy <skywagon185@gmail.
com>
> wrote:
>
>> Battery....Lithium
>>
>> Joe makes a very good point about the potential of Lithium base batterie
s
>> to potentially cause charging problems.
>> The other side of this combo is that when a "normal" alternator is
>> running at idle speeds the Lithium is able to handle receiving a very he
avy
>> current charge rate such that the alternator could easily overheat and b
urn
>> some internal part due to lack of cooling for such a heavy current draw.
>> There are gizmos made to take control of the charge rate such that it st
ays
>> under the alternators design limits.
>> The marine and RV folks use these controllers to safeguard their
>> expensive stuff.
>> David
>>
>> On Sun, Jul 2, 2023 at 6:02=AFAM user9253 <fransew@gmail.com> wrot
e:
>>
>>>
>>> Below is from https://earthxbatteries.com/faqs/
>>> I just installed my EarthX battery in my aircraft and started the engin
e
>>> and my charging amps was really high, is this normal?
>>> .
>>> Yes, this is normal. A lithium battery can and will accept a much highe
r
>>> charging current than an equal size lead acid battery.
>>> If your battery is not fully charged, your alternator can potentially
>>> output a current equal to
>>> or slightly above the alternator=99s rating for a few minutes to
top the
>>> battery off.
>>> . . .
>>> You must use a lithium battery that is designed to handle the current
>>> from the alternator
>>> or you can damage the battery, cause premature failure or possible even
>>> cell rupture.
>>>
>>> --------
>>> Joe Gores
>>>
>>>
>>>
>>>
>>> Read this topic online here:
>>>
>>> http://forums.matronics.com/viewtopic.php?p=511019#511019
>>>
>>>
>>>
>>>
>>>
>>>
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>>>
Message 2
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| Subject: | Re: Excessive Amperage |
Attached is a picture of a circuit which will limit the battery charging current.
It might be desired to limit the charging current to a lithium battery that is
too small to accept the full alternator output. Or it might be desired to limit
the charging current to avoid overheating the alternator. Choose diodes that
will drop about a volt and that can carry the expected current. Since the
charging voltage is one volt less, the charging current will also be less.
The bypass switch can be closed to charge the battery at full Voltage.
An on-delay relay could be used instead of the switch to reduce pilot workload.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=511074#511074
Attachments:
http://forums.matronics.com//files/bat_charge_current_limit_diode__140.png
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