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Just checked specs on new Maha C777 Plus. Be carefull if you plan on
charging from car. Max voltage on pack to be charged is 7.2 volts
from 13.8 source. Simpro makes a nice unit that charges up to 24V
packs from 13.8V.
Tim O'Rourke KG4CHX

Just checked specs on new Maha C777 Plus. Be carefull if you plan on
charging from car. Max voltage on pack to be charged is 7.2 volts
from 13.8 source. Simpro makes a nice unit that charges up to 24V
packs from 13.8V.

Or you could get a cheap 12v-110vAC inverter and run the Maha from that. The
inverters have been seen as cheap as $15!

Considering the display features of the Maha I am quite pleased I ordered
one at Dayton.

Thanks

Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer

GO BILLS!

Thanks for the heads up on the Maha C777 Plus regarding 13.8 VDC power input
and the limitations. Pres' workaround sounds......."workable" :-)

I bought one at Dayton and have used it several times with my Radio Shack
1600 MaH NiMH pack. Conditioning is very convenient, but I have had the
thermal sensor cut off the fast charge with an Error 3 every time. These
NiMH packs DO get hot on a fast charge. When I checked the capacity after
getting the premature thermal cutoff, it was still 1900 MaH so the cutoff
must be occurring at the very end of the quick charge cycle. The manual
says this (thermal cutoff) is "normal" so I don't think it is a problem.
Nice to know the thermal cutoff feature really works and could save the day
in the event of a battery fault, etc. The display features of the C777
Plus are great. The Dayton price of $69 wasn't bad either.

So far so good.

72,

Bill
W4RK
Nashville, TN
USA

12v-110vAC inverter and run the Maha
from that.

A word of caution...my boys left an inverter turned on (with no appliance
plugged into it) overnight. Turns out that the voltage tap in the back of
my wife's Ford is hot even when the car is off. Also turns out that the
inverter (that one, anyway) draws a fairly considerable amount of current
when "on" even if it's not powering any device. You can guess the result...

YMMV, hopefully.

73
John Newell
KB1FPM





























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On Wed, 23 May 2001 11:06:37 -0400, John Newell
KB1FPM wrote about RE: [FT817] Maha Charger :

12v-110vAC inverter and run the Maha
from that.

A word of caution...Turns out that the voltage tap in the back of
my wife's Ford

Thanks for the heads up about the inverter.

The 12V outlets in my Yukon XL are always hot. While there is a
feature that turns off the AM/FM radio & interior lights after 20
minutes, the 12V outlets are exempt. Flattened the battery with a 12V
camping cooler and then again over a period of 4 days in which the SUV
was not started. Second time with my TH-D7A & Garmin GPS continually
on. Time for either a dedicated 2d battery or Charge Guard.

73
Tom K4IIJ

It's also probably time for a new battery. You only get two or three
total discharges on a car battery before it's pretty worthless.

Ed Woodrick

Flattened the battery with a 12V
camping cooler

Not sure whether this came across clearly in my earlier post, but the thing
that caught me off guard was that the inverter itself, with *no* load
applied, flattened the battery. This one apparently draws enough current in
the on/no load condition to kill a battery. It's a 10-year old model, so
maybe there are better designs. BTW, buying one of the ones that cuts out
at 10.x volts won't, by itself, help, since your battery is dead for all
practical purposes at or near that level (around 10.5v for a 12v nominal
batt).

73
John Newell
KB1FPM

































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This message is intended only for the designated recipient(s). It may
contain confidential or proprietary information and may be subject to the
attorney-client privilege or other confidentiality protections. If you are
not a designated recipient, you may not review, copy or distribute
this message. If you receive this in error, please notify the sender by
reply e-mail and delete this message. Thank you.

John scrived (about a 12VDC-120VAC inverter):

It's a 10-year old model, so maybe there are better designs....

I keep half an eye on the alternative power scene, and my
understanding is that they still draw a pretty hefty "phantom load"
with nothing connected. Just like most every modern consumer-
electroncis device....