03/03/97
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HOW TO SET (BATTERY CAPACITY)
The first time you apply power to a Link 20, it assumes you have two banks of 200
Amp-hours battery capacity each. 200 Amp-hours is the factory default capacity. If your
battery capacity is different (and it probably is) you must change the declared battery
capacity. Before you try to set battery capacity, you'll need to know what your battery (or
battery bank) should deliver.
The surest way is to ask for the manufacturer's 20 hour rating. If that's missing, remember
that for 12 Volt liquid cells, a Group 24 battery has about 85 Amp-hours, a Group 27 size
has about 100 Amp-hours, a Group 30 has about 130 Amp-hours, while 4D's hold about
160 Amp-hours and the heavier 8D is generally about 220 Amp-hours. Gel cells generally
hold about 15% fewer Amp-hours for a given size. A Group 27 case gel cell stores about
85 Amp-hours.
If you use two batteries in parallel, as a single bank, use twice the Amp-hour capacity of a
single battery. For three batteries in parallel, use three times the Amp-hour capacity. If
you parallel batteries, use the same size and same age batteries. If you use two batteries in
series, such as two 6 Volt golf cart batteries, use the Amp-hour capacity of one battery.
For example, if you have three 12 Volt Group 27 batteries in parallel, you would use (100
A hrs x 3 ) 300 Ahrs for your battery capacity. Two Trojan T-105 6 Volt golf cart
batteries in series would use the factory default 200 Amp-hours for capacity.
If you need to change the default setting, here's how you do it:
1. Press SET for 5 seconds. SEL will appear in the numeric display.
2. Press SEL three times. The light will come on and 200 will
appear in the numeric display.
3. Press and hold SET. The display will move in 20 Amp-hour steps over
100 Amp-hours of capacity. 1 Amp-hour incre-
ments are shown from 20-40 Amp-hours of capac-
ity, 5 Amp-hour steps from 40-100 Amp-hours
capacity. If you continue to hold SET, after 4
increments the display scrolls faster. When the
value you want appears, release the SET button. If
you overshoot your capacity you will have to scroll
all the way to 1980 Ahrs after which the display will
roll over and begin scrolling up starting from 20
Amp-hours.
4. After 10 seconds, the displayed
setting is stored to memory and
normal operation resumes.
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