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Prius Power - Plug-in the other way

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Posted by bwilson4web on May 25, 2011, 1:12 am

Let's survey current and future Prius-inverter practices:

NHW11 - Off the shelf, 1kW, modified sine wave inverter

This model Prius can generate 1 kW of DC power and has been documented

My first modification, it has been used an average of once per year
since 2005. It also provides AC power for laptops when traveling. The
inverter cost $0 in 2005 and still goes for $0 at Harbor Freight.
Doug Schaefer has an 800W sine wave inverter in a similar

Due to the higher power from the ZVW30, a 1.5kW off-the-shelf, sine-
wave inverter will go into my wife's car. We will also upgrade the 12V
battery for something capable of handling the surge power, 3kW.

NHW20 - Modified UPS from Traction Battery

Described in:

It provides 3kW of house power but only at the house, The electronics
are integrated into the house and the otherwise stock Prius can only
supply power to one location.

XXXXX - Direct from Prius Inverter

When parked, the inverter has the ability to generate over 30 kW of AC
power to drive MG2. It is three phase lacking only the interface,
filters and control electronics. The Prius becomes stationary in high
power mode so mobile, AC power can be handled by smaller units.


There Prius exhaust can be routed through a 'gas heater' to make hot
water. The engine compartment heat can be captured and used for space
heating. The only thing missing is using natural gas to substitute for

Bob Wilson

Posted by bwilson4web on May 26, 2011, 8:14 pm
I just got more technical details about the inverter and found the
surge is time limited based upon the load:

load > 1.5kW :: 400 ms. duration, 24 cycles

maximum surge, 3kW

Since I'm planning to replace the OE, 12V battery with an Odyssey

12.8V - 100% SOC
11.2V - 10% SOC
925A :: 12.8 V -> 7.2  V in 5 seconds ~1.1V/sec.

3,000 W / 11.2 V = 267A << 925A

This will work. Now I will have to model and test the 1.5kW condition.
The fuses and past performance of the NHW11,  a full 1kW, suggests
there will be no problem but it has to be tested. But it looks like
we'll have:

o 110VAC @12A pure sine-wave - wife's car
o 110VAC @8A modified sine-wave - my car

With 99% of the carbon monoxide gone and so quiet they can''t be heard
across the property line, we'll be in the cat-bird seat. There will be
so little carbon monoxide that to dilute it to breathable
temperatures, it will be below the CDC threshold of 100 ppm.

Bob Wilson

Posted by greenpjs on July 7, 2011, 1:42 pm
 On Thu, 26 May 2011 13:14:28 -0700 (PDT), bwilson4web

Hi Bob,
Since you posted this a few months ago, I have purchased a 1500 Watt
pure sine wave inverter and plan to attach it to my ZVW30.  Have you
gone any further with your testing on your wife's car?  I took a look
at the car yesterday and was surprised by how small the battery cables
seem to be.  I don't have any technical information about the car's
electrical system.  Can the DC to DC converter (200v to 12v) really
supply 150 Amps?  I am wondering if I should start with something like
an 80 amp fuse or breaker for initial testing.  I would hate to
destroy the converter or blow a fusible link.  Or, can I really go to
a full 1500 watts?  (Surge is a separate issue I will have to deal
with, but my current question is about continuous power).

Speaking of surge, you did some calculations above assuming the OE
battery is replaced with a PC925.  Do you have a feel for how much
current can be drawn using the OE battery?  (In other words, do you
have the specs for the OE battery?)


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