[Milsurplus] 12v -- 24v Vehicle Power

[B. Smith]

There are plenty of circuits and boxes for chargine of two batteries, do a 
google on RV vehicles etc.






----- Original Message ----- 
From: "J. Forster" <jfor at quik.com>
To: <W9RAN at oneradio.net>
Cc: <jfor at quik.com>; "Military Surplus" <milsurplus at mailman.qth.net>
Sent: Tuesday, October 06, 2009 12:49 PM
Subject: Re: [Milsurplus] 12v -- 24v Vehicle Power


|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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|
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