Tech bulletin - Equalization

Tech bulletin - Equalization
Technical Bulletin
# 100203
Providing Electrical Independence
Issued: 03/24/00
Revised: 02/19/02
Affected Products: Solar Boost 2000
Obtaining equalization voltage with Solar Boost 2000
Liquid electrolyte lead-acid batteries can benefit from an occasional controlled overcharge which is
commonly referred to as “equalization”. To conduct equalization, a high charge voltage of approximately
15.3V is applied to a fully charged battery for approximately two hours. The equalization process restores
all cells to the proper specific gravity, drives residual sulfate off the plates and back into the electrolyte,
and eliminates electrolyte stratification. These instructions identify how to use Solar Boost 2000 to obtain
the desired equalization voltage.
These instructions do not address all safety and procedural concerns relating to
equalization. These instructions only describe how to obtain the higher charge voltage
typically required to conduct equalization using Solar Boost 2000. Not all batteries can
be safely equalized. Conduct equalization only in accordance with the battery
manufacturer’s detailed procedural and safety instructions pertaining to equalization.
Solar Boost 2000 can provide temperature compensation of charge voltage. By replacing the SensorLug™
battery temperature sensor with a fixed resistor, the charge voltage setpoint voltage can be adjusted to any
desired value. The figure below shows how a switch can be used to select between normal temperature
compensation, and equalization voltage. Note that if the SensorLug is not used it must be replaced in the
figure below with a fixed resistor of 1020Ω, which simulates 80°F. Also, temperature compensation must be
enabled as described in the manual. The figure below shows an equalization resistor REQ value of 768Ω,
which will increase the setpoint voltage by ≈1.3V producing an equalization voltage of ≈15.3V with Solar
Boost 2000 set for the factory default charge voltage of 14.0V. Different levels of voltage setpoint increase
can be obtained using the equation below. Use 1/4W 1% metal film resistors. Resistors and switches can be
obtained from Mouser Electronics;
3 – (∆V/3)
∆V = Desired voltage increase
over setpoint
{[3 + (∆V/3)]/1000} - 0.0000566
REQ = Value of Resistor placed
on temperature sensor
terminals to raise setpoint
voltage by ∆V
2598 Fortune Way, Suite K • Vista, CA • 760-597-1642 •
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