<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">The two biggest power hogs in OVMS v2 are:<div class=""><br class=""></div><div class=""><ol class="MailOutline"><li class="">The use of a LM to go from 12V -> 5V (blowing off 140%+ as much energy away as heat as we use).</li><li class="">Powering on the SIMCOM modem, and maintaining the GPRS connection.</li></ol></div><div class=""><br class=""></div><div class="">The PIC itself uses negligible power, by comparison.</div><div class=""><br class=""></div><div class="">Changing that is hard in v2. We can put the modem to sleep, but have no way of remotely waking it up.</div><div class=""><br class=""></div><div class="">In OVMS v3, we’ll switch to use a switching power supply. More complex, more noisy, and a little bit more expensive; but much more efficient at bringing 12V down to the levels we need without blowing off heat.</div><div class=""><br class=""></div><div class="">The SIMCOM modems have a low power mode where they can maintain a GSM connection, but not GPRS/3G, to drastically reduce power requirements. In that mode they can be woken up by a SMS. If we use Hologram.IO SIMs, where the incoming SMS is free, we could enable a mode where the modem is put to sleep. If an App connects, the server sends a free SMS to the module to wake it up; the module then powers up and establishes GPRS. Without Hologram.IO, we could still do this - but would need some way of remotely waking up the connection. The Wifi/Bluetooth radios have similar capabilities.</div><div class=""><br class=""></div><div class="">The framework I’m working on for OVMS v3 includes these low power modes as a fundamental function. I’m confident that we can really bring the power requirements down and offer several different types of low-power sleep mode.</div><div class=""><br class=""></div><div class="">Regards, Mark.</div><div class=""><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 25 Nov 2016, at 5:59 AM, Julien Banchet <<a href="mailto:jaxx@jaxx.org" class="">jaxx@jaxx.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class=""><div class=""><div class=""><div class=""><div class="">Hi Michael,<br class=""><br class=""></div>And thanks,<br class=""><br class=""></div>Mine is a 2012, also got the charger replaced in time, but maybe a simply power-tweaked one at the time... I didn't know it was the charger responsible for deciding to keep the 12v charged (I know it does the charge, though I believed the decision making was done elsewhere)<br class=""><br class=""></div>I'll put it in SMS mode tomorrow and see how it goes over the weekend (though I can't monitor the 12V without IP, i'll get the low bettery alerts though ;-) )<br class=""><br class=""></div>Can't wait for V3 !<br class=""><br class=""></div>JaXX./.<br class=""><div class=""><div class=""><br class=""><br class=""></div></div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Thu, Nov 24, 2016 at 10:47 PM, Michael Balzer <span dir="ltr" class=""><<a href="mailto:dexter@expeedo.de" target="_blank" class="">dexter@expeedo.de</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF" class="">
Hi Julien,<br class="">
<br class="">
I was lucky to get my charger exchanged just before end of warranty,
it's definitely better with the charger keeping the 12V battery up.<br class="">
<br class="">
Tough situation when parking underground. The module may use a lot
of energy if the GSM and GPS situation is bad. Switching off GPRS
and GPS should save a lot of power then. I'll have a look at it.<br class="">
<br class="">
Have you tried switching off GPRS to see how much that will help?<br class="">
<br class="">
The EEPROM data loss is a known issue, and I'm afraid there's
nothing we can do about that. It seems to be a bug in the PIC18.<br class="">
<br class="">
Regards<br class="">
Michael<div class=""><div class="h5"><br class="">
<br class="">
<br class="">
<div class="m_1166040457711103295moz-cite-prefix">Am 24.11.2016 um 22:10 schrieb Julien
Banchet:<br class="">
</div>
</div></div><blockquote type="cite" class=""><div class=""><div class="h5">
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<div class="">Hi all,<br class="">
<br class="">
</div>
Thanks to Michaels last message to remind me
to ask a question here:<br class="">
<br class="">
</div>
Since a few months, maybe a bit more because
it happens only once in a while, I have
noticed I wasn't receiving the SMS alerts
(feature on SMSIP mode) , and sending a
"Stats?" only gave me the nasty access denied
answer.<br class="">
<br class="">
</div>
It turns out, using the application, I noticed
that the phone number was getting corrupted
(afaik, it's the only setting affected)<br class="">
<br class="">
</div>
Normally: "<a href="tel:%2B33651886877" value="+33651886877" target="_blank" class="">+33651886877</a>" it became "+336k1886877"
or "+33651886Z77" etc... like a solar flare bit
flip !<br class="">
<br class="">
</div>
It seems it happens only upon reconnection of the
ovms module the the OBD plug (Twizy) as, well, the
12V battery, though brand new, can't last a weekend
(car parked underground, I suppose the GSM needs to
force a bit too much)<br class="">
<br class="">
</div>
So question: Has any one suffered from such an issue ?<br class="">
<br class="">
</div>
And, otherwise, Michael might be able to tell:<br class="">
</div>
Would having the feature on SMS only (without IP) consume
less energy ? If so, would it possible to imagine a Hybrid
mode, IP active only if vehicle on charge or keyon ?<br class="">
<br class="">
</div>
Thanks,<br class="">
<br class="">
</div>
JaXX,<br class="">
</div>
PS: Despite winter, thinking of building a solar panel + thin
plexi sandwich for the rooftop, just because of the 12V battery
:-) Only recent twizys can charge the 12V from the traction
battery when resting.<br class="">
</div>
<br class="">
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