From: Daniel Prince on
Bill <carver-rem-33(a)bellsouth.net> wrote:

>I have the Maha MH-C401FS and love it. 4 batteries on independant
>circuits so they each will charge as needed. Fast and slow charge
>options. I only use mine on 110 volt, but believe it came with a 220
>volt adapter.

But how do you travel back in time more than 30 years to when the
standard US household voltage was 110 volts?
--
I don't understand why they make gourmet cat foods. I have
known many cats in my life and none of them were gourmets.
They were all gourmands!
From: Ron Hunter on
SMS wrote:
> Ron Hunter wrote:
>
>> I use a small inverter I got at Sam's for $10 and which puts out 90
>> watts. I have run my laptop on it for hours, WHILE CHARGING and a
>> full charge only took a couple of hours. The inverter wasn't even
>> warm at the end. This certainly is cheaper than paying $100 for the
>> HP version of a car charger!
>
> I paid $55 for a universal iGo charger (wall/car/airplane) that works
> with two of my HP systems. I'm not sure the airlines would like you
> using an inverter on the EmPower system, but in any case, it's one less
> thing to carry when traveling.
>
> I have an inverter from Costco (80W) and it can't power the 65W adapter
> on a Dell laptop. I just bought an 120W inverter yesterday at Costco,
> but haven't tried it.

I rarely fly far enough that the batteries won't last long enough for
the time I can use the notebook during a flight. I bought the inverter
mainly for use in the car, and for emergency charging situations, such
as power failures. I was surprised that it could both power the laptop
and charge the batteries at the same time without heating up.
From: Ron Hunter on
SMS wrote:
> J�rgen Exner wrote:
>> SMS wrote:
>>> Thomas T. Veldhouse wrote:
>>>> I prefer to carry an inverter for in-car charging [aka cigarette
>>>> lighter adapter], which delivers a LOT more power, in excess of 60
>>>> watts in my case.
>>> The car outlet can supply about 120 watts in most cars, are you saying
>>> the performance is better on the 401FS with an inverter and the AC
>>> supply, than it is directly from the car with the DC cord?
>>
>> Well, both, the conversion to household power by the inverter and back
>> to charging load by the charger involve losses. So it is certainly not
>> more efficient.
>> But who cares about those losses which are maybe a few watts total
>> compared to the losses of the car engine which range in the many kW
>> area. It's really negligable, something like burning an additional
>> interior lamp or so.
>
> No, that's not what I meant. Some chargers specify different charge
> currents based on the power source, but I don't think that's possible
> the the MH-C401FS. The 12V from a car is typically fused at 10A, so
> there should be sufficient current for the same charge rate as on AC.
>
> The Tenergy T60008 has an AC flip out plug built in, and chargers at
> 600mA from AC, 450mA from 12V (car), and 250mA/cell from 5V (USB). The
> 12V charging current is related to the DC-DC converter limitations in
> efficiency, especially over such a wide range of voltage. At 5V/500mA
> input from USB, once you buck-convert, you're limited to about 1000mA
> total (250mA/cell).
>
> In any case, it's not the losses from the extra conversion that are an
> issue, it's carrying:
>
> a) a car charger cord
> b) a power inverter AND the wall power supply
>
> Can you imagine anyone doing (b) with a cell phone?

Sure. I do when I travel by car. Since I carry the inverter in my
laptop bag any time I go out of the house with the laptop, there is
really no particular problem. Now if own is trekking through the
Rainforests in Costa Rica, it might be a bad idea as power outlets are
not likely to be found there....
From: SMS on
Ron Hunter wrote:

> Sure. I do when I travel by car. Since I carry the inverter in my
> laptop bag any time I go out of the house with the laptop, there is
> really no particular problem.

Argh, it drives me crazy to have so many wires and devices strewn
everywhere around the mobile unit. I even installed a 12V outlet in the
overhead console by the rear-view mirror, so I could power the GPS
without running wires up across the dash.

> Now if own is trekking through the
> Rainforests in Costa Rica, it might be a bad idea as power outlets are
> not likely to be found there....

You need the solar charger for that. There aren't any 7-11's to buy AA
batteries at.
From: SMS on
Ron Hunter wrote:

> I rarely fly far enough that the batteries won't last long enough for
> the time I can use the notebook during a flight.

Yeah, YMMV. I do a lot of overseas and cross country flights. Seems like
doing Powerpoint presentations is more important than sleeping.