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Scan Gauge






on your

cell phone


Yes there's an app for that

Coming in October

No Amp Gauge

40 Amp
Constant Current

Without Amp Gauge

Only $79.95

100 Amp Relay!

Only $19.95

50 Amp
with amp gauge
2 cooling fans
frequency adjustable

No Constant



Free Shipping

35 Amp


with fan

New low price



Is This You?

40 AMP
Constant Current

Can Be Preset
For any Current Level From 10-40 Amps

Only $79.95

Can Also Be Adjusted By The End User


Basic 50 Amp PWM
With Frequency Adjust

New low Price

Only $89.95


Mini Amp Gauge

With 100 Amp Shunt

New Lower Price

Only $29.95

Green Only


30 Amp PWM

For Small Cells

USA Oil Policy

40 Amp Constant Current PWM


* NEW*

40 Amp

Constant Current PWM


This is the all new Constant Current PWM

Made by Hydrogen Boost Now.Com

Works Great On Dry Cells Between 13-27 plates


Just Set It And Forget It



After almost a year of testing, the all new 40 amp Constant Current PWM is ready for sale.

We at Hydrogen Boost Now wanted a new PWM that would meet the needs of today's power hungry

dry cells and have the features that are not available from most others PWM's.

This PWM was made to meet those needs.


This PWM is easy to use,

Prevents thermal runaway,

Improves cold starting times,

Produces more monotomic hydrogen,

Improves the efficiency and the life span of your Dry Cell.



What Is A Constant Current Pulse Width Modulator?

A constant current PWM will automatically adjust the pulse width from the PWM

so that it will output a constant level of current regardless of how large the load is.


In other words

Set this PWM to 30 amps and the current will always be 30 amps (RMS)

This compensates for:

Voltage changes in the charging system,

Temperature changes in your cell,

Different levels of KOH in your cell.


This makes it much easier to set up your cell and the end user is less likely to

to add too much KOH and burn out fuses,

pop circuit breakers, or melt down the cell and wires.


Available in green or bright blue





This PWM has many new features:


..........* Constant Current... Current stays within .5 - 1 amp of set point (average)
..........* Digital amp gauge pre-calibrated at 30 amps (Available in Green or Bright Blue)

..........* A remote port for a dash mounted water light and power switch (Not available until 2012)
..........* Very strong, easy to use bolt on connectors rated at 60+ amps

..........* Extra thick circuit board and large mosfet transistors

..........* Internal fan to keep the PWM cool but also helps keeps water out

..........* Frequency adjustable in the range that works best for the Dry Cell (75Hz-1,500Hz)

..........* 12 Volt switched output for an EFIE or other computer controlled device (For remote)

..........* High peak power rating for large Dry Cells (This PWM was tested with a 65 amp load)
..........* PWM will power on and off without a relay (we recommend to always use a relay for safety)

..........* Two pages instructions to help with installing and cell setup

......... * Professionally assembled with surface mount and through hole parts, no hand soldering



Is It Time To Up Grade From Your Old PWM
To A New Constant Current PWM?


100's In stock

Only $99.95

All PWM's include

2 Ring Connectors
3 Spade Connectors

6" Shrink Tubing
2 Pages of Instructions



40 Amp
Constant Current PWM With Amp Gauge and Ring Connectors



Select Amp Gauge Color

Select Ring Connector

Select Logo

For Custom Text Logo
you must leave a note in paypal
18 letters or less, Text only


50 or 100 Amp Relay

With Connectors

Select Relay


Not Made In China Wire Kit


50 Amp Marine Grade Wire Kit + Shrink Tubing and 4 Ring Connectors

Relay And Wire

Must Be Purchased With Our PWM

International Customers

Can use this Add to Cart
for (1) PWM

40 Amp PWM
With Green Amp Gauge
10 gauge Ring Connectors and
World Wide Shipping

$15.99 shipping will be added to each order


International Customers sometimes forget to pay for shipping.

You can use the Add to Cart on the left and $15.99 shipping will be added to each PWM.

If you want 2 PWM's or a custom logo, it is better to use the Add to Cart above, select 'Ship Outside US' and you will only be charged $15.99 for 2 PWM's.

If you forgot to add shipping,
here is a Button to add $15.99
Shipping to any order that will fit in a flat rate envelope.

Add International Shipping




90 Day Warranty

If this PWM fails within 90 days,
we will replace it at no cost to you.
You will need to pay for shipping to us.

You must use a fuse to protect the PWM.
We will not replace the PWM if you connect the + and
- wires backwards or connect the PWM to a load greater than 60 amps.


This PWM is built rock solid and is very easy to use

Every unit is Pre-tested and calibrated using a 60 amp Dry Cell

Shipping takes 2-4 days by priority mail


* Supply Voltage: 10-15 VDC
* Output Current: 10 - 40 amps continuous RMS
* Peak continuous load is 60 amps (tested)
* Duty cycle or pulse width: Automatically adjusting from 10% to 100%
* Frequency: On board adjustable from approximately 75Hz - 1,500 Hz
* Efficiency with a 30 amp load better than 98%
* Cooling fan is rated for 12-15 VDC
Output Mosfets are rated for more than 100 amps each
* 7/16 bolt on connectors rated for 60 amps
* Circuit board traces rated at 65 amps peak or 45 amps continuous
Digital amp Gauge is rated for 10-15 VDC Accuracy 1 amp
* Box Size 4.7" x 3.25" x 2" not including mounting flange


Need lots of 10 or more?

Please call or send us an E-mail




The sensitive electronics have been covered with potting compound

to prevent water damage and to prevent copying.


This circuit board is copyrighted © by AZ-Hybrid


Also Available:

40 Amp Constant
Current Without
Amp Gauge
40 Amp Constant
Current With
Onboard Current
40 Amp Constant
Current With
Onboard Current
Adjustment And
Amp Gauge



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