Pwm Charge Controllers Are Becoming More Popular

Twelve years ago Heliotrope General pioneered this concept with the introduction of the CC-10 PV charge regulator. Prior to this time all PV chargers were simple on/off regulators. The problem with an on/off regulator is when the desired regulated voltage is approached. At this point charging is turned off and thereafter you get a lower battery voltage reading.

PWM (Pulse Width Modulation) strategy takes over when the battery has reached the point of voltage where other chargers turn off. PWM slows down the "filling of the battery" (like topping off a gas tank) as it approaches its maximum charge potential. This slowing down of the charge rate has the desirable effect of greatly reducing the water used by the battery plus bringing the battery to a higher State Of Charge (S.O.C.) faster.

PWM by itself is a misnomer for our charge controllers. Actually the charging sequence is a "Series " of three distinctly different stages. The first stage is the bulk charge where all available module power goes to the battery. The second is the PWM stage where the battery is more slowly charged to top it off exactly at the selected S.O.C. The final stage is a trickle charge to maintain the S.O.C.

Prices of these superior PWM controllers has always been and will always be higher than on/off regulators. Just look at the circuit board of the two types and you can see the difference in the quantity and types of components required to perform the more sophisticated control.

Although the cost for a PWM controller is frequently twice or more, this cost difference is justified. In terms of total systems cost, a PWM charger adds less than 5% to the total bill. The results from this expenditure represents an excellent investment in overall system performance...S.O.C. is always higher, less water is used, and battery life is lengthened.

Components that handle the power in Heliotrope General controllers are overrated. Users do not need to derate our specified current ratings.

Call us at 800/552-8838 and receive our brand new full color consumer leaflet for the SOLPAN™ Power Center. SOLPAN™ is listed by ETL to UL 1741.

Our products are available through leading AE Distributors and Dealers worldwide.

The name means reliability.

Heliotrope General 3733 Kenora Dr. Spring Valley, CA 91977

The name means reliability.

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