[VHFcontesting] The digital modes and the Sept contest

[Sean Waite]

We use 2 100Ah deep cycle agm batteries in parallel. It handles an IC746 @
100W on 2m and an IC7000 @ 100W on 6m both transmitting at the same time ,
with the current draw of the other radios we have on RX, probably 45A or
so.

Sean WA1TE

On Wed, Sep 13, 2017, 19:28 Barry Hansen <barry at k7bwh.com> wrote:

> Interesting battery discussion. Also interesting that the IC-910 seems to
> take significant d.c. power.
> I've recently acquired an Icom IC-9100 and I'm trying to choose the 13.8v
> portable power source. Last weekend in the Sept VHF contest the rig was
> set up for the first time with my SUV, and I discovered that my usual
> single automotive (Sears Diehard) sealed lead-acid battery is
> insufficient. This battery has worked well with an FT-897 and an IC-7100,
> but the larger power drain of the IC-9100 causes the rig to reset itself
> on xmit.
> Is there a way to calculate how long two car batteries in parallel would
> last?
> I already have a small Honda generator although I don't usually bring it
> along unless I'm using an amp.
> Thanks in advance,
> Barry K7BWH
> Seattle CN87us
>
> -----Original Message-----
> From: VHFcontesting [mailto:vhfcontesting-bounces at contesting.com] On
> Behalf Of Alan Larson
> Sent: Wednesday, September 13, 2017 3:42 PM
> To: vhfcontesting at contesting.com
> Subject: Re: [VHFcontesting] The digital modes and the Sept contest
>
> > Hi Alan.  That is useful info re the ic910.  I'm just curious what
> > type of batteries are you using.
> >
> > I've had considerable success running my ic7300, FT736, multiple
> > Icom706MkiiG's, an icom 735 IF radio, 300 watt amps on 50 and 144 MHz,
> > transverter, etc..  from two 12 V 100 AH Agm style batteries.
>
>   Over the years it has varied, but typically I would have 25 - 30 amp
> hours of sealed lead-acid batteries in parallel with the starting battery
> of the diesel VW.  Solar would be attempting to hold that up.
>
> > I took another 100 AH battery with a solar panel with me during the
> > June contest and used it to run an inverter that in turn powered the
> > battery chargers for the computers and also powered another charger to
> > top off the two radio batteries.  I had ample power for approx 6 to 8
> > hours of operation including some MSK144 at close to full power on 50
> MHz.
>
>   When operating from a small motor home, I have used 200 AH of battery
> feeding an inverter feeding a switching power supply to run the rig.  In
> the more space limited Volkswagen, a small Honda generator has proven to
> be the most convenient option.  (This includes consideration of the
> difficulty of getting all the items inside the Jetta.)
>
>   For low power operation, I would still choose solar if available, but I
> wanted full power from the rigs.
>
>         Alan
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