[Milsurplus] 12v -- 24v Vehicle Power

[J. Forster]

A diode can easily add resistance and voltage drop to the circuit,
limiting the circulating current. If the setup is properly designed, the
relay wiring could easily do the same.

Even as little as 1/10 Ohm, would likely limit the current to pretty safe
values. (Ex: If the batteries were at 13.6 and 11.6; 1/10 Ohm would limit
current to 20 Amps)

You just don't want to be charging a battery fast enough to make it blow
open w/ steam or H2.

-John

==============


> J. Forster wrote:
>> Wiring batteries in parallel is not a really great idea, unless you
>> insert
>> some resistance in the circuit in the charging mode.
>>
>>
> Hmmm....a lot of RVs, boats, etc that have auxiliary batteries to run
> appliances, lighting, etc to avoid discharging the battery used for the
> engine use a relay or diode "isolator" to put the aux battery in
> parallel with the vehicle battery for charging.     I have one that uses
> a simple relay, no resistance in series, and just replaced the deep
> cycle aux battery after getting 10 years of use from it.
>
> 73, Bob W9RAN
>
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