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DIY Manual

ManualsBrandsMidNite Solar ManualsSolar & Wind PowerDIY Series Inverter & Charger with built-in MPPT controller
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50 | P a g e 10-543-1 REV A
DIY Manual
3. Charge Time = 0.42 x (400 Ah / 65A) = 0.42 x 6.15 hours = 2.6 hours.
For the EQ timer, refer to your battery manufacturer specifications.
T-Comp
There is only one setting in the Classic that can influence a different voltage than what you
programmed (i.e., Absorb, Float, or EQ) and that is temperature compensation. You can check
what the Classic thinks it is supposed to be charging to at that moment by going to the Charge
menu and then into the T-Comp sub-menu and pressing the right soft key labeled “View.”
As a battery gets colder than 25 degrees Celsius, the temperature needs to be elevated. As a
battery gets warmer than 25C, the temperature needs to be lowered. You should check with
your battery manufacturer and get the following three values:
1. Millivolts per degree C per cell to compensate (Default is -5mv). This setting is found in
the Charge menu under T-Comp.
2. Reference temperature for the battery (Default is 25C). This setting is found by pushing
status four times to get to the WBjr screen, then depressing the right soft key twice.
3. The maximum voltage to ever compensate to. This setting is found in Charge/Limits.
To do a sanity check, go to the Temp menu and write down the battery temperature, use that
value in the formula below.
1. Temperature Offset = Number of cells x T-comp setting (Usually -5mv) x offset in degrees
Celsius from the reference (Typically 25C).
EXAMPLE:
a. Assuming a 24V battery at 10C with a -5mV per cell offset.
b. 12 (battery cells) x -0.005 (millivolts per degree C per cell) = -0.06 x -15
(Temp differential, 10C - 25C = -15C) = 900mV or 0.9v above the set point.
c. For example, if your Absorb charge voltage was set to 14.8V, then in this
scenario the batteries during Absorb will charge to 15.7V (14.8 + 0.9V).
2. If the battery was warmer than 25C, you would subtract the final value from the set point.
EXAMPLE:
a. Assuming a 24V battery at 35C (or 10C higher than temp reference of 25C).
b. 12 (battery cells) x -0.005 (millivolts per degree C per cell) = -0.06 x 10
(Temp differential, 35C - 25C = 10C) = -600mV or -0.6v below the set point.
c. For example, if your Absorb charge voltage was set to 14.8V, then in this
scenario the batteries during Absorb will charge to 14.2V (14.8 – 0.6V).