Hello,
I have a Best Ferrups 3.1KVA and I noticed that the percent battery voltage
reported from upsc never gets above 69.9%. I believe there is a mistake in the
driver. The battery percentage is calculated based on the High Battery Alarm
Setpoint (59.6V) instead of the Ideal Voltage which is about 54V (4 batteries x
13.6V). I examined the source code and found that the variable fc.fullvolts is
the result of querying parameter 67 from the UPS. This parameter is defined
per Ferrups Tip 503 as: "The battery voltage at which the UPS sound a High
Battery alarm" A better value to use in determining the percent battery
voltage would be fc.idealbvolts which is calculated in the driver source...
I propose the following patch to fix the battery.charge (% battery full)
reading.
--- bestfcom.c.orig 2012-07-31 12:38:59.000000000 -0500
+++ bestfcom.c 2013-05-11 09:39:52.155279710 -0500
@@ -332,7 +332,7 @@
/* Compute battery percent left based on battery voltages. */
battpercent = ((vbatt - fc.emptyvolts)
- / (fc.fullvolts - fc.emptyvolts) *
100.0);
+ / (fc.idealbvolts - fc.emptyvolts) *
100.0);
if (battpercent < 0.0)
battpercent = 0.0;
else if (battpercent > 100.0)
The patch is based on version 2.6.5
Thanks for your consideration. I know this is an old UPS (1995) but it still
works and I'd like to keep using it :)
--
Bo Kersey
VirCIO - managed network solutions
If it is free, you are the product.
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