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From: Arild Jensen (no email)
Date: Tue Dec 02 2003 - 23:43:14 EST
Jack Ray wrote:
I have often heard, that paralleling unlike battery banks (ie, a small starting
battery and a large bank of deep
cycle batteries) will likely result in overcharging the smaller battery and/or
undercharging the house bank.
It seems that this would be the case regardless of how you go about paralleling
the banks.
I suppose the problem is even worse when you parallel gel cells and flooded
cells together.
REPLY
This was covered in several thread dating back over two years.
The variable factors that influence this are such things as cable size,
connector resistance, length of cables between the two banks and the age and
degree of sulfation in the batteries. In addition, the voltage sensing of the
charging source can be major benefit or detriment depending on configuration.
Ray wrote:
If the starting battery is almost fully charged and a large house bank 50%
discharged, when you parallel them and place a charging current in the
circuit, it seems to me the starting battery would be fully charged long
before the house bank, and would then bubble away unnecessarily for the
whole time the house bank is charging. If this doesn't happen, why doesn't
it?
REPLY
Damage to batteries generally occurs during the latter stages of absorption and
during the float stage when three stage smart chargers are used
Single stage Ferro-resonant chargers tend to boil a battery because of the
prolonged period of time the battery voltage is held to the full charging
voltage of 14.1V without temp compensation.
Some of the best older Ferro resonant chargers did have some temp compensation
and did not boil the battery.
Other chargers like the Lamarche chargers were often adjusted to never exceed
13.8V or even 13.5 V
This lower voltage did not boil the electrolyte but neither did it ever fully
charge a battery.
Unless some other charging source like an alternator was also used frequently
and for long periods, these batteries died a premature death from sulfation.
While still working for Xantrex I was tasked with finding out if it was possible
to boil a perfectly good battery using a perfectly good charger.
The answer is yes.
After lengthy analysis of situations and reviewing the charging algorithm
software I demonst5rated how under some circumstances a perfectly working
charger can boil a brand new good battery.
Invariably paralleling was involved and involved a complete mismatch in size of
the start bank relative to the house bank.
I won't bore the long time subscriber with a rehash. Its all in the archives.
regards
Arild
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