|Item code||Model number||Amps|
A Controller for Virtually any DC Charging Source
The C40 has long been the mainstay of our charge controller line-up, its versatility and reliability have made it an industry standard. Now the C40 is joined by two companion controllers, the C35 and C60. All three of these fully solid state, microprocessor-driven controllers are UL and cUL listed. C Series controllers may be configured for PV battery charging, or DC load control or DC diversion operation. Whatever the charging source, a C Series controller is sure to meet your DC controller needs.
Silent Microprocessor Control
All C Series controllers (C35, C40 & C60) have a powerful microprocessor at their core which increases system performance and maximizes battery life. They are fully solid state and operate silently.
PWM Charge Performance
C Series controllers (C35, C40 & C60) all use Pulse Width Modulation (PWM) charging profiles which are designed to provide a full charge to your battery while, at the same time, minimize gassing which can shorten battery life.
3-Stage Battery Charging
All C Series controllers (C35, C40 & C60) automatically initiate a 3-stage battery charging cycle. Bulk, Absorption, and Float modes are used to ensure that voltage and current settings accurately match the batteries' actual state of charge. This means fast-as-possible charging and extended battery life. An auto equalize mode can be easily switched off when the controller is used with sealed batteries. C Series controllers are factory set for solar PV battery charging operation.
There are a number of field configurable, user adjustments for C Series controllers. C35 and C60's can only be set for 12 or 24 VDC operation. The C40 may be configured for 12, 24 or 48 volt systems. Bulk and Float voltage set points are user adjustable which allows use with a wide variety of battery technologies including; flooded lead acid, gel, and absorbed glass mat. In addition, there are manually selectable settings for Nicad batteries.
DC Load Controller Mode
When used as a load controller, the C Series (C40) will automatically turn a DC load on or off at predetermined battery voltage settings. Both LVD (low voltage disconnect) and LVR (low voltage reconnect) set points are user adjustable.
DC Diversion Mode
In this mode, all power, which is not used to maintain a full charge on the batteries, is diverted to a load dump such as water or space heaters. Diversion mode is used to regulate microhydro and wind turbine systems which need a constant load.
LED Status Indicator
A simple to read, multi-color LED indicates operating status and is standard on all C Series controllers (C35, C40 & C60).
UL and cUL Listed
C Series controllers are listed by UL to exacting UL 1741 and cUL CSA 22.2 107.1-95 standards. C Series controllers (C35, C40 & C60) are also CE compliant (European countries) and are designed to CTIK standards (Australia). Their current ratings are "real world" and do not have to be derated to comply with USA NEC 125% overcurrent requirements.
Digital Display (Optional)
CM, CMR/50, CMR/100-A back-lit meter which continuously displays: battery voltage, DC amperage, cumulative amp hours and amp hours since last reset. CM mounts on front of C Series, C35, C40 and C60, charge controllers. The remote meters CMR/50 and CMR/100 use simple telephone type plug-in connectors. 50 ft. (15 m) or 100 ft. (30 m) cable included. If used with a wind turbine, this will only measure voltage.
BTS/15 or BTS/35 Monitors battery temperature and adjusts charging voltage for maximum performance. A 15 ft. (4.5 m) or 35 ft. (11 m) cable with standard telephone type connectors is included.
Two years workmanship and materials.
|Voltage Configurations||12 VDC||24 VDC||12 VDC||24 VDC||48 VDC||12 VDC||24 VDC|
|Maximum PV Array Open Circuit||55 VDC||55 VDC||125 VDC||125 VDC||125 VDC||55 VDC||55 VDC|
|Charging/Load Current @ 25 °C||35 amps DC continuous||40 amps DC continuous||60 amps DC Continuous|
|Recommended Breaker Size With Recommended Wire Size in Conduit||60 amps DC, #6 AWG||60 amps DC, #6 AWG||60 amps DC
(100% continuous duty cycle),
#6 AWG (90 °C rated)
|Maximum Peak Current||85 amps intermittently-electronically protected|
|Maximum Voltage Drop||0.30 volts -charge control mode|
|Total Current Consumption||While operating - 15 ma (typical), at idle - 3 ma (tare)|
|Charge Regulation Method||Solid state, 3-stage (Bulk, Absorption and Float) Pulse Width Modulation (PWM).|
|Regulation Adjustment Settings||Charge Control Mode Setup for:|
|Lead Acid Battery||12 Volt Configuration:
Float 12.5 - 14.5 VDC
Bulk 13.0 - 15.0 VDC
EQ +1 VDC above Bulk
|24 Volt Configuration:
Float 25.0 - 29.0 VDC
Bulk 26.0 - 30.0 VDC
EQ +2 VDC above Bulk
|48 Volt Configuration:
Float 50.0 - 58.0 VDC
Bulk 52.0 - 60.0 VDC
EQ +4 VDC above Bulk
|NiCad Type Battery
(VDC above adjustment setting)
|Float or Bulk (add 2 VDC)||Float or Bulk (add 4 VDC)||Float or Bulk (add 8 VDC)|
|Load Control Mode||
Low Voltage Reconnect (LVR) - Subtract 1 V (for 12 VDC systems), 2V (for 24 VDC systems), and 4 V (for 48 VDC systems) from the Bulk setting.
Low Voltage Disconnect (LVD) - Subtract 2 V (for 12 VDC systems), 4 V (for 24 VDC systems), and 8V (for 48 VDC systems) from Float setting.
||Multicolor LED indicates the operating/battery
|Low Voltage disconnect
(Load Control Mode)
|User selectable manual or automatic
reconnection - includes warning flash before disconnect and provides a "grace"
(Charge Control Mode)
|User selectable manual or automatic
equalization (every 30 days)
|Short Circuit Protection
||Fully electronically protected with
|Field Adjustable Control Setpoints (test points provided for high accruacy)||Two user adjustable voltage setpoints for control of loads or charging sources (settings retained if battery is disconnected)|
|LCD Meter Panel
(CM, CMR/25 CMR/50, CMR/100)
|Back-lit, 2-line, 32 character, alpha
numeric liquid crystal display panel for remote (CMR/XX) or front mounting
(CM) on the C Series controller. CMR/25 includes 25' (7.5 m) of cable. CMR/50
includes 50' (15 m) of cable, CMR/100 includes 100' (30 m) of cable. Displays:
battery voltage, DC amperage, cumulative amp hours, amp hours since last
|External Battery Temperature Sensor (BTS/15, BTS/35)||Provides automatic adjustmentt of the charge control setpoints to the battery temperature. BTS/15 is supplied with 15' (4.5 m) of cable, BTS/35 cable length is 35' (11 m)|
||Indoor, ventilated, powder-coated
steel with 3/4" and 1" knockouts
|Specified Temperature Range
||32 to 104 °F (0 to +40 °C)
|Allowed Temperature Range
||-67 to 167 °F (-55 to +75 °C)
|Altitude Limit (operating)
||15,000 feet (5,000 meters)
|Altitude Limit (non-operating)
||50,000 feet (16,000 meters)
|Dimensions (H x W x D)
||C35: 8" x 5" x 2.5" (20.3 cm x
12.7 cm x 6.35 cm)
C40, C60: 10" x 5" x 2.5" (25.4 cm x 12.7 cm x 6.35 cm)
||Vertical Wall Mount
|Weight (Controller only)
||C35: 2.5 lbs (1.2 kg), C40: 3.0
lbs (1.4 kg), C60: 3.0 lbs (1.4 kg)
|Weight (Shipping)||C35: 3.0 lbs (1.4 kg), C40: 3.5 lbs (1.6 kg), C60: 3.5 lbs (1.6 kg)|
|Certifications||UL Listed to UL 1741 and CSA 22.2 107.1-95.
Designed to CTIK Standards.
|Warranty||All C35, C40 and C60 controllers are warrantied for two years against defects in workmanship and materials.|
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