| Re: [GMCnet] What size engine battery do you use? [message #93679] |
Wed, 28 July 2010 14:28  |
Richard Brown
Messages: 281
Registered: May 2009
Karma: 1
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Senior Member |
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It may not be right, but what I try to do is get the biggest battery that'll
physically fit & the highest-amp alternator that I can find that will bolt on.
The bigger alternator may pull more hp while it's charging, but it doesn't take
as long to charge up the battery. The bigger battery has more reserve power
before calling on the alternator to recharge it. I plan on moving the house
battery to the generator compartment & putting another starting battery in it's
place, using the isolator to keep them both charged. I will then attach a
combiner to the existing wire running to the converter using it as a charging
wire to the house battery while the motor is running. I will start the genset
with a riding lawn mower battery. Since the genset battery charging circuit on
the genset is still working, I'll leave it alone. I'd rather not use any battery
for more than 1 job, so I'd rather not use the house battery to start the
genset. I'll keep the circuits as separate as possible with any interconnections
handled by combiners.
Richard & Carol Brown
PO Box 941
Lindale, TX. 75771
1974 GMC Eleganza SE (DILLIGAF)
wings77sporty@sbcglobal.net
(903)881-0192
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Richard & Carol Brown
1974 Eleganza SE
1174 Hickory Hills Dr.
Murchison, TX. 75778
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| Re: [GMCnet] What size engine battery do you use? [message #93706 is a reply to message #93679] |
Wed, 28 July 2010 19:38  |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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"The bigger battery has more reserve power
before calling on the alternator to recharge it." Not exactly true. It has more reserve power, but power used has to be replaced by the alternator just the same and there is no time constant delay "before" the battery has to be recharged. It is possible to use more power with the larger reserve battery. With the engine running, the power will be coming from the Alt (Alt voltage is above Batt voltage) not the Batt until the load is increased to the point where the voltage sags in the system and current starts to flow from the Batt. The larger the battery, the lower the impedance and the greater the potential load on the Alt during recharge. I use the Delco group 78 6 YR stock size engine battery and it is fine.
John Lebetski
Woodstock, IL
77 Eleganza II
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