HOWTOSET 
(BATTERYCAPACITY)
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 4Ds 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 V 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 Ah x 3) 300 Ah 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 five seconds.
2.Press SEL three times.
3.Press and hold SET.
4.After 10 seconds, the displayed setting is stored to memory and normal operation resumes.
SEL will appear in the numeric display.
The 
light will come on and 200 will appear in the numeric display.
The display will move in 20 amp-hour steps over 100 amp hours of capacity. 1 amp-hour increments are shown from 20–40 amp hours of capacity, 5 amp-hour steps from 40–100 amp hours capacity. If you continue to hold SET, after four 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 1980amphoursafterwhichthedisplaywillrollover and begin scrolling up starting from 20 amp hours.