This unit is used with Wind Machines to control the charge on a
battery or to limit the output voltage on a wind generator when it is
When a battery is full, or a grid intertie inverter goes off-line
(for any reason)
the power of the wind machine is diverted to protect the wind machine,
battery and/or grid intertie inverter.
Unlike solar panels which are safe to leave in a open circuit
condition, wind machines must always have a place to put their power
when they are in the wind generating power. If wind machines have no or
very little load and the wind is blowing, very high voltages and speeds
are produced, damaging the wind machine and any equipment hooked to it.
At Solar Converters, we have seen 250 V come from a 24 V "regulated"
Principle of Operation:
When used as a battery charger, the LDR connects directly across the
This Wind Machne Controller charge controls a battery by "stealing" the
excess (wind machine current - load current)
charge current. When the battery is not yet full, the LDR "steals" no
current and basically removes itself from the circuit so every bit of
the wind machine current voltage and charges the battery. If the excess
current produced by the wind machine is 10 amps, it steals 10 amps. If
the excess charge current is 12 Amps, it steals 12 amps. etc. Without
the excess current (wind machine current - load current) otherwise
charging the battery, The battery voltage is limited to the voltage
that the LDR is set to, effectively clamping the battery charge
controlling the battery voltage at its "full" charge voltage. As well,
three stage charge control is employed as well as an optional
temperature compensation feature.
Voltage Clamp (Dump Load) Controller:
This wind machine controller is virtually identical to the battery
charge version, however, it has been modified to connect across the
input of a grid intertie inverter to protect both the inverter and the
wind machine from excessive voltage due to high wind ouput or the grid
intertie going offline for any reason, including the currently mandated
5 minute start up requirements on the inverter.
Hot Water Heater Controller:
This controller is identical to the battery charge controller but uses
its taper clamp abilty with added capacitors to maximze the power drawn
from the windmill when used to heat water by keeping the windmill at
its optimum blade speed as the wind speed varies.
- Remote Sense: to prevent voltage errors due to wire resistance
- Temperature compensated (with optional TC-2 temperature probe)
- Three state charge method (constant current, overcharge float
- 1200 Watt rating for 1000 watt windmachines>98%
- Ultra High Efficiency >98%
- Requires dump load which can be air resistors or hot water
|Nominal Voltage (V)
|Maximum Output (A)
|Maximum Output (A)
short term - 10 sec
- less than 0.5 lb. open frame
- Less than 10 lbs NEMA 3R Enclosure
- open frame 4.8" X 4.8" X 1.5" -require bolting to a metal
- Nema 3R enclosure 8" X 6" X 4"
- Power: Battery and load resistor
- 2 X #6 AWG Terminal Block
- Signal: T. Comp and remote sense
Note: In the interest of continuous product improvement,
specifications subject to change without notice.
Order Model No:
LDR 48-30 Battery charge controller-open frame for mount in user box
LDR 48-30E Battery charge controller ina Mema 3 R enclosure
LDR 48-30C Battery charge controller ina Mema 3 R enclosure and all
LDR 48-30DL for Dump Load Controller