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39 Battery Desulphator by Solar Converters, Inc.
Solar Converters model BD-2 Version 2
Battery Desulphator / Desulfator.
As Solar Converters is no longer in business, this
item is not available.
We are keeping the description for reference
Sulphite crystals form when the battery charge is reduced and/or
the charge/discharge cycles are not suited to the battery(s).
The sulphite crystals act as insulators to the flow of electricity into
They reduce the electrolyte absorption / disorption in the battery
plates which reduce the battery capacity.
This desulfator uses a sharp pulse of current forced into the battery to
suddenly jar the sulphite crystals and cause internal resonances - both
mechanical and electrical.
This breaks away the crystals so they may dissolve into the electrolyte.
Battery life is also extended.
The magnitude of pulses are precisely controlled and are adjustable
by the user.
They can be customized to your battery(s).
It also allows you to reduce any interference caused by the desulphator.
> A single unit handles 12 to 48 volt systems (maximum input of 63 volt d.c.)
> The pulse strength is adjustable from 0.0 amps to 10 amps
> An LED indicates unit operation
> An LED indicates the relative strength of the battery(s)
> Adjustable on / off voltage which can be adjusted to operate only when
the battery is near full.
> Low amp draw
> The on/off control can be adjusted with a voltmeter and a small screwdriver
> Self consumption is less than 0.05 mA from battery at full pulse
> Efficiency is greater than 96% over 20% pulse load.
> Dimensions: 3" by 2" by 1.5"
> Operating temperature is from - 40 to + 60 deg. C
> Simple to wire
To see the Battery Desulphator owner's manual please click onto the
To see the Basic Operation guide on this page please click onto the
following link: BD-2 Basic Operation
To see the BD-2 wiring layouts on this page please click onto the
following link: Wiring Layouts
Please note the following:
The BD-2V2 is pre-set at the factory to come on when the battery
voltage reaches about 13.5 volts (for a 12 volt system) during
You can set it for the charging voltage of a 24, 36 or 48 volt battery
The BD-2V2 will not come on until the charging voltage comes up
to the set point on the unit.
The BD-2V2 is designed to send out pulses to your battery (s) only
when the system is being charged.
Sulphite crystals from when the battery charge is reduced and/or the
discharge/discharge cycles are not well suited for the battery.
These sulphite crystals act as insulators to the flow of electricity in the battery,
seriously degrading the capability of the battery to have electricity flow in it,
reducing its charging and discharge capability.
This unit uses a sharp pulse of current forced into the battery suddenly to "jar"
the sulphite crystals and cause internal resonance, both mechanical and electrical,
to grind down the sulphite crystals that form so they be re-combined into the
For increased performance, this unit precisely controls the magnitude of the
sharp pulse of current, which is adjustable by the user.
This adjustment is important as no 2 batteries are the same and no 2 battery
set-ups are the same.
As well, battery desulphator, as they work with current spikes, may interfere
with equipment connected to the unit.
This adjustment allows the user to tailor the both the current spike and at what
voltage it is present.
This unit requires an external 0.5 amp fuse in line fuse.
Using wire of sufficient gauge (#16 AWG or better), connect the red wire to the
battery positive and the black wire to battery negative.
This unit has 2 adjustments, one for pulse strength, and one for turn on voltage.
Turn on Voltage
Use a meter inserted into the 2 test points. Determine the voltage that you wish
to operate the unit at.
This is usually 95 % of the battery float voltage.
The unit has a 1/20th scale factor so divide the voltage you wish to operate at
or above by 20.
This voltage (1/20th scale) is the setting of the V-on pot.
Adjust the set pot to set the desired voltage calculated above.
The unit will now operate only when the voltage is above this set voltage.
For example, a 12 V battery floats at 14 V.
Thus the unit should operate at above 13.5 V (14 * .955).
Using the TP and GND setpoints and a digital multi-meter, adjust the V-On
voltage set voltage using a small screwdriver to 0.65 V (13.5 /20 = 0.65 V).
It is factory set to 0.65 V for 12 V batteries.
The Pot marked strength controls the magnitude of the current pulse.
Its usual setting is in the middle for a 5-amp pulse.
By moving the Pot to 0, the unit puts out 0 amp pulses (essentially off).
By moving the POT full to 10, the unit puts out 10 amp pulses.
For more detail, please see drawing on page 3.
Note: If other equipment is connected to the same battery, it may be affected
This adjustment may be used to reduce interference while still having the
benefits of the desulphation action.
Some charging sources are better than others and batteries may be of
different health to begin with.
1) New batteries or batteries that will still hold over 25 % charge.
No special care is required of the setup.
The battery is sufficiently strong to tame the output voltage variations of almost
any charger independent of its quality that would reasonably be used with a
battery of that size.
Attaching the desulphators will clean and prevent sulphation of these batteries
as they go through their usual charge/ discharge cycles.
2) Badly Sulphated Battery
If the battery is very sulphated i.e. it cannot hold much of a charge itself, extra care to
recover the battery must be taken.
Typical lower quality charging sources like hardware store car battery chargers or
standard PWM controllers will over voltage the battery as the battery does not have
the capacity to “tame” the higher voltage pulses these units put out.
With no or very little battery attached, other failures modes may occur while it is
In this case, make a coil of wire by wrapping 10 turns of the wire around your hand
and use this coiled wire to connect the dead battery to a good battery that has a
charge controller attached to it.
Connect the desulphator to the bad battery.
The wire coil forms an inductor which will block the pulses from going into the
good battery so it goes into the poor battery,
and the good battery with its charger will keep the bad battery from being over
voltage or damaged by the voltage wide variations of a lower quality charger source.
If the charger has a clean DC output (very little ripple) regulated to the float charge
voltage like a DC power supply or one of Solar Converters Inc. MPPT charge
controllers, the desulphators and battery can be directly connected without the
need for an additional battery to tame the charger.
If you would like to print this wiring layout I would suggest that you
put your cursor in the center and print it as a picture.
You will get the best results printing it this way.
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