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Leading edge, intelligent condominium and workgroup charging

Opportunistic power use that borrows power from idle appliances to charge cars
 Two stage power sharing process increases power use efficiency to almost 100%
Electricians can get the most from your electrification budget by sharing power
by wire, by phase, by panel and by building service

Now offering fully enabled OCPP stations that advance the state of the art by offering zero-power standby options using adaptive load management

Fixed system price - no indeterminate running costs - your initial system price is all you pay (subject to optional third-party billing)


We can help you save 60-80% of the garage electrification costs
and achieve multi-level  price reductions for charging equipment from Canadian sources


Level 2 Charger with included, improved load control capabilites at $1595.-

Available for most single residences and townhomes.

A decade of experience in garage electrification

We describe how we actually deliver system that others are just starting to think about.
We design EV electrification for the remaining life of your building

Automatic TOU

After installation there are no adjustments, no tweaking, no performance worries - charging takes place at the most advantageus rate possible regardless of time of day.

Simultaneous variable supply and demand control

Limits demand using multiple means:
a) by using the power from switched-off standard appliances and
b) by managing that power for charging so it is shared efficiently


Variablegrid: making group charging at work and at home realistic

How to borrow power to charge your car.
Least-cost EV charging solution when sharing power in a building.
Extensible EV charging solution for buildings with little or no charging capacity.

Make condo EV charging more affordable

If you can adapt the existing building electrical plant to pull double duty you are most of the way there, because now the cost and risk for initial EV owners is lower.
Even if your building has no spare capacity we can usually find enough power to electrify most of the parking area.

Increase the value of your condo with EV charging

If initial costs are low it is easier to sign up additional EV owners to share them. So a technical design that enables recoverable-cost wiring for additional EVs goes further in promoting acceptance.
One-wire shared charging really cuts down on costs if you can attach additional stations to it directly.


Certified EVSE

32A 60Hz AC continuous current
-30C to +50C, interior/exterior - NEMA 4
Zero charging current event handling
Cord connected or hardwired
Fully automatic TOU adaptation
OCPP Control server made in Canada
Learn more...

Simultaneous EV charging

Efficient simultaneous variable load and variable supply response

The calculated current allocated to each EV (green) depends on both the instantaneous level of power demands by other loads  as well as the number of EV's and their demands (black.)

The allocation efficiency of idle available power is close to 100% because command/control is local and immediate.

Typical retrofit variablegrid wiring

Reusing already installed wiring 

The EV loads are sharing the existing suite load wiring. By sensing the common current we offer a high degree of both safety and wire economy, reducing the need for service level increases.
In marginal budget cases this can make it possible for the project to move ahead.
Applies to single residences and to MURB's.

Variablegrid superior power use

Find  charging power where you normally can't

We don't just share power between EV's, we share power with everything in the building. So to us a stopped elevator is the same as an unplugged EV - they both free up charging power immediately.
Learn more...

Extend your electric car battery life

Not all EV batteries are created equal, but they can all benefit from some basic care.

The reason for caring for a battery is that it is the most expensive part of an EV. The fuel you need is always there, it just needs to be activated, or charged. How that is done can improve battery life.

At variablegrid our main concern is to automate the EV charging process so that battery life extension is part of the home charging process. This most often takes place overnight.
After all, routinely all you do is plug in the charger and walk away. You let the EV decide how much is enough. The variablegrid system then uses that power elsewhere if you are charging in a condo.

Variablegrid takes that automated charging process one step further: you can tell it whenever necessary how much distance you will need to drive tomorrow. It will remember that until you change it. Or until you disable it.

The result is that you can maintain your battery charge level at a desired percentage, one of the most important requirements for longevity.

In shared EV charging environments like condos it has the added advantage that those whose needs for charge are higher stand a better chance of being serviced.

Intelligent, efficient EV charging for condos

We solve the most important EV charging issue in existing condos - a lack of planned power available to charge electric cars.
Variablegrid overcomes this with the use of a technique called current pooling that draws idle power from appliances that are turned off and uses it to charge electric cars. This almost always makes the required power available.

The reason this is an important EV electrification feature is that it allows the entire garage to be wired while respecting a legislated minimum power budget for each car.

Another reason is that adding new power delivery into an existing building can be an expensive undertaking and very often not possible due to aging, incompatible equipment in place.
Finally, reducing up-front costs makes it more attractive to consider electrifying the garage as a cooperative undertaking.

Initially, there will only be few EV's for motivated users, but over time as numbers grow it becomes impossible to forecast which of the parking stalls will need power. The most rational approach is therefore to ensure that all are capable of electrification, although initial wiring may not actually need to be deployed.

Parking stalls are generally classified as limited common property, so they cannot be traded between owners with EV's and those without. Besides, the significant growth rate of EV adoption ( can easily require that they be wired on short notice.

Another likely scenario is where the condo owner sells to an EV driver.  Such an owner may be able to command a premium for already supporting EV charging.

The value of the building will increase because we add full electrification that is designed to last for its lifetime. We built our equipment accordingly.

Improving EV charging and making condo charging easier



Size and function matter

small, graphic display, easily mountable, fixed or connector wiring;
unattended operation in the field is measured in years; we never had a control failure report


Zero waste policy

idle power is virtually zero and efficiency close to 100%


Immediate control

the routing of power flow is local, fast, responsive, and not dependent on Internet latency


No misty horizons

we avoid all possible periodic, recurring running costs


Avoids rat's nests

variablegrid uses larger, fewer wires throughout the garage, so installation labour can contribute to lower costs; each charging station taps directly into these wires, wherever an EV is parked


No volume buying pressure

EV chargers can be added incrementally, one at a time


Slender is elegant

our power sharing granularity is about 100W so as EV's join/depart, other cars are less affected


Fits like a glove

we allow you to customize your EV charging requirements so you are either done faster or get all you need



with the use of building load monitoring aggregate power use is elastic – future power-use upgrades have minimal service impact;
automatically restores full control after power failures and/or communications failures                        

The procedure for measuring aggregate current in a distributor and using the measured values to allocate power to charging EV's using their pilot signal is covered by patents US 8,314,511 and CA 2824200. 

                                                     A skeletal explanation of the patent

                                              or how to borrow power to charge your car

Building power wiring consist of stages, each meant to accommodate the protection and physical placement of loads, like elevators, lighting, suite power and EV's.

Stage 1 is delivered by the power company, stage 2 branches into major areas such as say, different buildings, stage 3 assembles wiring end-points where appliances and EV's are actually connected.

The wiring at each stage has a maximum electrical rating regulated by the Electrical Code and it may not carry more power than the preceding stage is rated for.

If lines A and B where original wiring and line C was added to charge EV's, then line C can use additional power from lines A and B when some or all loads on those lines are switched off. This requires sensing the amount of power flowing in stage 2 to lines A,B.C so as to know how much power can be "borrowed" from that line without exceeding its rating.

The wiring at stage 1 may also have to be sensed if the amount of borrowed power is within safety margins, but exceeds original usage limits for the building.

In a nutshell: the patent is restricted to measuring power in lines that are common to both EV's and non-EV appliances and using that value to regulate EV charging, but it has exclusive domain over this procedure.

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