Flexcharge™ NC25A Ultra
High Efficiency Charge Controller (Regulator)
NC25A Ultra High Efficiency 25 Ampere Solar and Wind System
Charging System Controller
For Lead Acid GEL, AGM, and Flooded cell Batteries. Also
works with wet cell NiCad batteries. Do not use on Lithium batteries of any
The NC25A-(X) is series regulator
designed for alternative energy charging systems ranging in size from 0.1A to 25A. It is the ideal regulator
for Solar (PV) and Permanent Magnet Generators (Including outboard motors and smaller wind generators). The NC25A
also includes the Charge Divert feature. Charge Divert allows you to use the excess charging source energy
for other tasks, or for placing a load on permanent magnet charging sources such as wind generators to prevent over
speed conditions. The Divert connection is only activated after the charging source is making energy and the
batteries are not using the energy (i.e. A wind generator will not be starting into the divert
load). Divert Resistor
This controller can easily and inexpensively be expanded to handle one or more
banks of 100A charging sources. (1000A max charging current in this configuration). Multiple battery
banks can be charged with the use of a standard battery charging isolators.
Years prior to the sale of the
first NC25A, the SES Flexcharge product development team took a hard look at what a new alternative energy charge
controller's performance level would need to be to give the user the best possible controller for there
needs. From that effort came the following design criteria;
Charging Efficiency . The NC25A
holds a Patent for its innovative and efficient charging circuitry.
Most alternative energy charge
controllers operate at an efficiency of 97%. Off hand, this sounds pretty good but lets go through the
numbers for a typical charge controller.
Power Wasted = (Total Charging
Current) x (100% - 96%) x (Typical Battery
Voltage). P = 25A x 0.04 x 12.6V = 12.6W of wasted
operates at 99.5% typical charging efficiency. (99.9% at its best).
P = 25A x 0.005 x 12.6V =
the numbers we see a 11 watt gain in charging energy that is available for your battery bank with the NC25A over
the Typical Charge controller.
Question: How much does an 11W solar panel
cost? This is precisely why controller efficiency is so critical.
With a peak
charging efficiency of 99.9% and an operating current of only 4mA, more of the systems charging energy will get
through a NC25A into your batteries than with any other regulator on the market. Models are available for
charging 12V, 24V, 36V, and 48V systems. Use with Lead Acid, Gel, or Flooded Nicad battery
There should never be such thing as a
compromise to dependability when it comes to an alternative energy system charge controller as these systems are
often located in hard to reach locations (mountain tops, ocean navigation buoys, polar regions, etc...). We
took great care to design the NC25 for long term unattended operation; extensive transient voltage
protection; high steady-state voltage protection (it is not affected by continuous charging input voltages up
to 100V, the point where the transient voltage protection kicks in); reverse polarity protection on battery
connections; fully sealed electronics for 100% humidity operation; etc... The NC25A is designed for Install
and Forget operation.operation; etc...
OperateEnergy State Taper Charge
The NC25A includes easy to read Charge
and Divert Indicators, an adjustment for peak charge voltage, and an easy to use terminal strip for the system wire
connections. Because the system charge controller is usually located near the battery bank in a remote
structure we chose not to incorporate power consuming monitors such as volt meters or current monitors. If
this type monitoring equipment is desired it should be installed after the system disconnect switch and located
where you can view them.
Easy Upgrades Expansion Kits
Upgrading the controller to regulate
higher currents can be accomplished easily, and is relatively inexpensive see page 21 in the manual
at NC25a Manual 2012.pdf See
special instructions for converting the NC25A to a high amperage dump load controller NC25A DUMP LOAD CTL.pdf
This graph describes the charging
process used by all Flexcharge controllers. It has many benefits including greatly reduced gassing during
charging and it allows for micro-equalization of Lead acid as well as sealed Gel and AGM battery
technologies. Click on the link for more
- 5 YEAR
- COMPLETELY SEALED ELECTRONICS FOR
MARINE OR OUTDOOR MOUNTING.
- LOW BATTERY VOLTAGE INDICATOR.
(FLASHING RED LIGHT).
- ARC REDUCTION CIRCUITRY TO ELIMINATE OR
REDUCE RELAY CONTACT WEAR.
- CHARGING EFFICIENCY BETTER THAN 99.50%
FROM 0.5A TO 30A OF CHARGING CURRENT.
- OPERATES EFFICIENTLY (98%) WITH AS
LITTLE AS 0.1A OF SOLAR PANEL CHARGING CURRENT.
- EFFICIENTLY CHARGES BATTERIES FROM 0
VOLTS WITH FULL POWER.
- 25 AMP CHARGE CAPACITY. SPECIAL ORDER
24V, 36V, AND 48V MODELS, OR EXPANDED MODELS WITH CHARGING CURRENT CAPACITIES UP TO
- 25 AMP CHARGE DIVERT CIRCUIT. STABLE
DIVERT CIRCUITRY PREVENTS ERRATIC RELAY SWITCHING IF CHARGE SOURCE VOLTAGE DROPS.
- DIVERTS ONLY WHEN VOLTAGE AND CURRENT
ARE AT USABLE LEVELS. PERFECT FOR MOTOR TYPE DIVERT LOADS (FANS, PUMPS, etc...)
- PEAK CHARGE VOLTAGE ADJUSTMENT WITH A
RANGE OF 13.8V TO 15.9V (Multiply by 2,3,or 4 to find voltages for 24V, 36V, or 48V
- CHARGES WITH THE SAME HIGH ACCURACY
THROUGH BATTERY ISOLATORS.
- CONSUMES LESS THAN 5mA (0.005A) WHILE
CHARGING AND AT NIGHT, 2mA IF YOU DO NOT USE THE CHARGE INDICATOR.
- CHARGES BATTERIES AT FULL POWER, BELOW
THE PLATE SATURATION POINT, THIS CHARGES BATTERIES FASTER, AND REDUCES ELECTROLYTE DEPLETION BY UP TO 90%
OVER CONVENTIONAL CONSTANT VOLTAGE, PWM, & HIGH FREQUENCY CHARGE REGULATORS.
- BATTERIES START CHARGING AT 0.005A OF
- CONTROLLER CAN WITHSTAND OPEN CIRCUIT
INPUT SPIKES OF 1500V/A, & 140V CONTINUOUS WITHOUT DAMAGE.
- REVERSE POLARITY AND TRANSIENT VOLTAGE
PROTECTION ON THE BATTERY SENSE WIRES.
- NO POWER WASTING SAMPLE
- REMOTE BATTERY VOLTAGE SENSING SO THE
CONTROLLER CAN BE MOUNTED ANYWHERE BETWEEN THE CHARGING SOURCE AND THE BATTERIES.
- EASY TO INSTALL USING THE LABELED
CORROSION RESISTANT NICKEL / BRASS / STAINLESS STEEL CONNECTOR.
- U/L 94V-O RATED ENCLOSURE AND UL LISTED
OR RECOGNIZED COMPONENTS.
NC25A-12 Operating Characteristics
|Charge Input Voltage
Allowable Battery Voltage on Sense Wires
(Multiply by 2, 3, or 4 for 24V, 36V, or 48V
|Standby/Operating Current of the Controller
|Occasional Short Term Over-Current (1/2 Second Max.)
|Total Charging Efficiency
|Insertion Loss Resistance (Ohms)
|Charge Divert Current
|Charge Divert Over Current (1/2 Second)
|Transient Surge Protection (20uS)
4"W x 3.75"H x 1.5" D
NC25a Manual 2012.pdf
Charging Algorithm Explained
Where to buy