Bogart Engineering’s Solar Battery Charge Controller

The  solar battery charge controller, SC2030, is manufactured in the U.S.A. and presents unique advantages for solar.

The SC-2030 higher voltage finish charging is intended to compensate for this by boosting voltage towards the end of charge when the current declines. It is then important not to go too far or too long at this higher voltage (107% overcharge” does not mean 107% of the total battery capacity. It means 107% compared to the previous low discharge point during the last discharge cycle).

If the previous discharge was very shallow, it may be only a small number of amp hours extra, compared to what was removed last time. This is why measuring the percent overcharge is important to keep from overcharging; a function that is monitored by connecting with the TriMetric-2030. Also regulating the charge current when the voltage is high is important. The SC2030 doesn’t allow the voltage to go above 14.3V until the current drops to 2%of C.

The SC-2030 is a precision, high efficiency PWM (pulse width modulated) Solar Array Battery Charge Controller. The objective of this design is to maximize the life of your solar panels batteries by allowing the flexibility to adjust solar charging specifically according to the way your battery manufacturer has specified. The success of its high performance depends on being connected to a TM-2030 (TriMetric Battery System Monitor). This controller is only recommended for use with 12V or 24V solar panels.

Many people believe that MPPT type chargers are always better than PWM chargers, however when Bogart compared theirs to at least one commonly used MPPT charger they found that under very ordinary conditions the SC-2030 delivered more charge to the batteries. The conditions in which the SC-2030 was measured and tested were: at an ambient temperature of 70 F degrees in full sun, and when the proper panels were matched to the batteries and charging was over 13.0 volts (the most common charging range with lead acid batteries).

The SC-2030 Solar Charger, working with the TM-2030 battery monitor has never before seen benefits that can extend the life of your battery system. Made in the U.S.A. and available soon!

 For more information please visit:

Sales brochure is available here (page 2 lists the SC2030):

For more detailed information:

Here is additional information from battery companies on how you to decide when to go to float:

For Trojan, pay special attention to the graph on page 19. Caution: be sure to go into float when a specific amount percentage of overcharge is achieved– about 115% of overcharge (compared to last discharge). This is important to avoid overcharge.

For Rolls AGM batteries, pay special attention to the graph on page 25. This chart, unlike Trojan, has the important information that tells when to go into float:  They call this “IUI” charging. Note this on graph: Termination: F= 2.5mV/Cell/hr or 105-110% recharge.

For US Battery’s liquid electrolyte batteries, view page 2 and 3. “Constant current, constant voltage, constant current” charging instructions.  Charging at 20% C is OK up to 14.4V– but above  14.4 volts they suggest charging up to 15.3 volts provided  the charge current is limited to  3%C (at temperature of 77F) This is what they consider to be the optimum method–what they call the “three stage” charging method. This mentions a dV/dT criterion as well–but this is impractical for solar because it requires the current to be absolutely steady current, which solar isn’t; measure percent of overcharge instead. Also see the second paragraph on page 1 that mentions the overcharge percentage–but shows an unusually wide range.

For Full River, see what they call IUIU charging characteristic for their AGM batteries.

For Concorde, they recommended 107% overcharge, with voltage going as high as 17 volts. It’s important to limit current to 2%C when going up to 17V. When charging current is higher, the voltage must be limited to 14.3V. See page 20

For Interstate, same as Concorde