Well, TS-7800 consumes 5 watts, that is I=P/U = 5W/12V =~ 0.4+ amps, and
current consumption is increasing when battery voltage drops (because consumed
power is always nearly the same). Once it worked up to the point when battery
voltage was just 8.5V (way too low for a 12 volt lead-acid battery, by the way).
0.4 amps with a (car size) deep cycle battery (70 Ah, let's say) will bring you
an uptime of 70A*hrs/0,4A = 175 hrs =~ 7 days = 1 week. You should get the same
results with a higher voltage battery like 24V and 35 Ah.
I have used the "ts7800ctl" program which can put the TS-7800 to "deep" sleep
for specified time, dropping current consumption near 1 milliamp. Like that, my
system has been up autonomously for several months, but it is possible, when
waking up for a few minutes and once a day, to achieve something over a year.
Jaan
--- In "Robert" <> wrote:
>
> Jaan,
>
> Thanks for the feedback. I got my TS7800 with the TS-781 option. What kind
> of uptime did you get from your lead battery setup?
>
> --- In "Jaan" <jaan_r@> wrote:
> >
> >
> >
> > Hi Robert,
> >
> > Yes, I've run TS-7800 from several different 12 V sealed lead-acid
> > batteries (from 7 Ah to 70+ Ah). With option TS-781 of course, the small
> > 8...30V to 5V converter. Then you don't have to add anything to monitor
> > battery voltage (TS-781 input voltage it is directly attached to one of the
> > ADCs with 1/9 voltage divider).
> >
> > But no experience with a solar panel. Should be easy to make a simple
> > charging system which does not need the controlling opportunities of
> > TS-7800. With a lead-acid battery and a solar panel mixed system, the only
> > thing you should need (for a 12 volt battery) is a small system with
> > 13.6...13.8 volt voltage limit for float charging.
> >
> > It should be equally easy to use a 6 volt lead-acid battery with the 5 volt
> > power system (that means, if you don't have the TS-781). You certainly need
> > to add 2...3 silicon diodes in series (type 1N4007 for example) between
> > battery (+) and TS-7800 (+), or else, something on the TS-7800 may burn. To
> > charge the battery with float charging, you need a voltage limit of
> > 6.8...6.9 volts. For full (cyclic) charging, the 2...3 silicon diodes are
> > not good enough for protection, because the voltage of a 3-cell sealed
> > lead-acid battery may go up to 7.5 volts (sometimes more), and then you
> > need a good 5 volt voltage converter with a low drop, in the place of the
> > diodes.
> >
> > I've also used four NiMH AA-size batteries in series (about 4.8 volts) to
> > power the TS-7800, but it was a temporary solution because the batteries
> > won't probably last over an hour (the current consumption is up to 1 amp).
> >
> > I haven't tried lithium (Li-ion, LiPo) based technologies.
> >
> > Jaan
> >
> > --- In "Robert" <robace_22@> wrote:
> > >
> > > has anyone run a ts7800 on batteries (vs. the wall mount)? has anyone
> > > tried using a solar panel?
> > >
> >
>
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