I had mentioned it somewhere before here on the MB but haven't put my hands on it yet (oh, no!). This "feature" is clearly documented in the instruction manuals, but not specifically noted to end up with this result. This will stop the automatic recalculation and fix the recharge efficiency to be 0.94. Also set the recharge efficiency factor to manual of 0.94 instead of the automatic setting of 0.95. These parameters are not ever going to be met, so that means that the Link 20 will never think the batteries are fully charged until the AH used are fully counted down to zero. The fix for this gotcha is to set the Link 20 parameters to 15v and 1%. This is not true of course, but it makes the under-charge condition worse. 0.97 vs 0.95) so the at the next charge cycle the Link 20 thinks that the batteries require fewer input AH for the used AH. Then to make matters worse, the recharge efficiency factor is recalculated to a higher value (ex. This causes the battery charge current to drop below the 2% threshold and after 6 minutes the Link 20 thinks the batteries are fully charged because the charge voltage is over 13.2V, the charge current is below 2% or 9.2A, and these conditions have been met for 6 minutes. Now one of the refrigeration units turns on drawing 5A. The scenario for the Link 20 gotcha is this: The charging current has tapered down to about 13A with 20Ah still to go with the charging voltage at 14.4V. This undercharge showed itself as a low terminal voltage in the morning, sometimes as low as 11.9V when the voltage was 12.4-12.5 or so when retiring for the night. Over the month I calculated that they were about 140Ah down out of the 460Ah capacity. Thus I thought my batteries were being fully recharged but actually they were reported to be full but were short. Without realizing this was happening, my golf carts were being cheated of 10-20Ah at various recharge cycles during the month. This can happen even if the used AH are not counted down to zero. When these two parameters are met, the Link 20 blinks the top green LED indicating full charge, resets the AH used to zero, and recalculates and stores the charge efficiency factor for future charging. In my case those parameters were 13.2V and 2%. First the charging voltage must be at or above the entered parameter and the charging current must be below the percentage of the bank capacity that is also an entered parameter. When charging, the Link 20 considers the battery to be fully charged when two conditions are met. The Link 20 has an "gotcha" that isn't real obvious. In a post today, Rich summed it up pretty well, as follows: Rich Stidger with his Hunter 40.5 from Rhode Island, and Donalex from the U.K., helped me to understand this. Last year I was involved in a detailed discussion over on co.com about how they work, related to another issue altogether. In discussions over the course of a few years, and since I finally installed my Link 2000 last year, I have been investigating the operation of the Link algorithm and how it affects the indication of "complete" recharging.
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