There are no commercially-available plug-in hybrids on the market so far. (So you cannot plug them in, other than the same gas station pump that most other regular cars use.) Some hobbiests and aftermarket companies have been altering a few hybrids (Prius, Ford Escape Hybrid/Mercury Mariner Hybrid) to make them plug-in capable. Typically this requires adding additional hybrid batteries, besides the ability to charge off the mains.
For more information, check out
http://www.calcars.org/vehicles.html
For cost reasons, unless you are a fleet owner or other high-mileage driver it probably will not be worth the cost of the PHEV conversion for you. (Conversion pricing is high due to startup costs and low volumes, besides the pricing of the needed additional battery packs.)
To note, converting to a PHEV (plug-in hybrid electric vehicle) does not reduce the vehicle's range. It gives the owner the option to recharge the (newly added larger) hybrid battery pack at night (cheap electricity and off-peak electric load which would otherwise be lost). The vehicle would run for a certain distance (longer than stock) on the stored electric power alone, and when the battery pack is depleted to a certain point the vehicle reverts back to its original hybrid self and runs on a combination of the gasoline engine (which will also recharge the battery) and the electric motor. A PHEV would add a greater all-electric range to the existing hybrid, besides the ability (but not the requirement!) to plug it into an electric source.
Toyota is working on creating a PHEV Prius, and has some test vehicles on the road. Supposedly for the 2010 US model year, and only for fleet customers at first (so not general retail).
http://pressroom.toyota.com/Releases...T2008011405523
http://pressroom.toyota.com/Releases...T2007072552930
http://www.toyota.co.jp/en/news/07/0725.html
video:
http://www.toyota.co.jp/en/tech/envi...nce/index.html
quoting from the pressroom.toyota.com site above:
"The prototype PHEV system is designed to operate in a similar manner
to the current Prius, switching from pure-electric mode, to gas-engine
mode to a combined gas-electric mode. The big advantage is that the
PHEV's prototype battery pack is capable of storing significantly
higher levels of electricity, supplied by "plugging into the grid" for
periodic recharging sessions. With significantly more electric power
in reserve, the vehicle will be capable of operating in pure-electric
mode for longer periods of time and at much higher speeds than the
current Prius. This will result in substantial gains in fuel economy
and a major reduction in total tailpipe emissions of smog-forming
gases, over current conventional hybrid systems."
Anyhow, that's for the HV NiMH hybrid battery, which I assume that you were asking about charging... But why would you be concerned about it not being completely charged when you got home? It is supposed to be like that stock.
The displayed charge on the HYBRID battery (as seen on the Energy Monitor) rarely ever reaches "full" or "empty" but prefers to stay at a happy medium. The display only shows you the useable area of charge on the hybrid battery, displayed "empty" is about 40% and displayed "full" is about 80%. Actual charge levels of a NHW20 Prius (current hatchback model) can be seen at:
http://www.privatenrg.com/#Full_SOC The two bottom purple/pink bars are about 40-47.5% battery charge. The most common middle four blue bars are about 45-66.5% battery charge. The two top green bars are about 64-81% battery charge. (If you have an older NHW11 Classic Prius, the displayed charge levels on the Energy Monitor normally sit at 3/4 and occasionally at 1/2, and rarely go to 1/4 or full.)
Quoting from a June 22, 2004 Toyota press release:
http://pressroom.toyota.com/photo_li...ml?id=20040623
http://pressroom.toyota.com/Releases...T2004062345528
The Prius battery (and the battery-power management system) has been designed to maximize battery life. In part this is done by keeping the battery at an optimum charge level - never fully draining it and never fully recharging it. As a result, the Prius battery leads a pretty easy life. We have lab data showing the equivalent of 180,000 miles with no deterioration and expect it to last the life of the vehicle. ....
To quote from Toyota:
http://www.toyota.com/html/hybridsyn...l/battery.html
"Q: Do they [the hybrid batteries] ever run out of power?
GS: No. A computer makes sure the batteries never discharge completely. They never fill completely, either. "
So yes, it is normal to not see the battery display on the Energy Screen reach green/full very often. (Even when it does read "full" - like after coasting down a long hill/mountain - the battery still isn't charged to full, to prolong the battery life.) It is also not common to see a low/pink battery icon either - usually a long uphill climb or heavy AC use (since the AC is electrically-powered off of the hybrid battery, and is not a conventional belt-driven off the engine AC).
There is no reason to be concerned at all to see the battery level at either extreme, either. The car takes care of itself, and you don't have to do anything special. (Turn off the display, or just stay on the more useful Consumption Monitor.) If the hybrid battery is too low on charge, the Prius will just turn on the gasoline engine to recharge it if necessary. If the hybrid battery is too high on charge, it'll bleed off as much energy as needed by running on electric only or occasionally by spinning the gasoline engine with the electric motor (similar to B mode).
However, there are some other products that one can use to plug in a Prius to a house electrical outlet:
- engine block heater - this is a product that plugs into a house electrical outlet, and connects to the engine block to warm up/preheat the engine oil and engine. It is a easily orderable item for the Prius in Canada, and some dealers in northern/cold US states may also stock it. It is used to keep the engine oil from getting too solid in extremely cold climates, but more commonly to help pre-heat the engine so startup warmup time is shorter.
- (I've heard of some products available in Europe that plug in to the house electrical outlet, and sit in the passenger cabin and pre-heat the cabin for you, but I've not seen them.)
- 12v battery tender or trickle charger. Just like any other vehicle, if left undriven for a long enough period of time the 12v accessory battery can go flat thanks to parasitic loads from the car (like the alarm system, clock/radio memory, any lights left on, etc.) and then not be able to start your car when you return. Myself, I only drive my Prius a couple of days, every other month or so (normally I walk or take public transportation everywhere), and I got tired of always having to jumpstart my Prius, so I now plug it in using a Battery Minder
http://www.vdcelectronics.com/index.htm to keep the 12v battery's charge up (though I considered a Battery Tender
http://www.batterytender.com/ and some solar panel 12v charger options as well).
And then there are some people that have installed inverters and used their Prius as a home generator to power their house when they have lost electricity to their house.
http://www.priups.com/
http://hiwaay.net/~bzwilson/prius/priups.html