Great info. Yes, I considered the extra 12v battery and then 120v inverter at 1.5 kW to drive an L1 cord, but as you say, it would
Be quite inefficient. With the 240W solar panel, probably giving a total of 1kWh per day (average per year at my latitude), then that would only give about 50 minutes of charging at L1. Hardly worth it. So my probable use is: 1) Wire solar charger to 12v battery for charging/maintenance – AND providing 12v power for when car is ON and sitting, to reduce the static VOLT load of about 500W when sitting-and-ON. Can anyone confirm the true energy load when Volt is ON and parked? 2) Wire to small GT inverter connected to J1772 charging socket so that while sun is shining and Volt is plugged in, then my home grid gets the power. But then I have to standardisze on either a 120v GT inverter and only L1 charging or go with a 240v GT inverter and only use L2 charging.. But only the 120v GT inverters are cheap enough to be practical here (about $75 each) My Volt is already configured with a 1500 W quasi-sine inverter in the trunk just for routine running of tools, etc and lighting/refrigerator in the house when the grid goes down. So that is why having the 240W of solar panels can provide some benefit. Frankenvolt: http://aprs.org/my-EVs.html Yesterday I completed the rear-end sidecurtain stuff and it seems I was able to do it with flat plywood sidecurtains and a modestly curved piece of plywood and plexiglass across the back. I was amazed that I could find surfaces where the mostly flat plywood would fit and close the gaps. Bob *From:* Marco Gaxiola <mgaxi...@gmail.com> *Sent:* Monday, May 18, 2020 2:05 PM *To:* Electric Vehicle Discussion List <ev@lists.evdl.org> *Cc:* Robert Bruninga <bruni...@usna.edu> *Subject:* Re: [EVDL] FrankenVolt coming along... That is correct, none of the HV wiring outside the battery pack will energize, before those internal HV contactors pre-charing, closing and energizing the HV bus first before any HV module can draw or add energy from the pack. The magic process starts typically when you plug your J1772 EVSE on a 120Vac outlet. (L1) there is only a small number of modules on the Volt-EV that wakes up after Pilot signal handshaking with the EVSE, and all this happens on the 12V side first. After a few validations, one of those awaken modules have the ability to wake up the BMS inside the battery pack and also provide 12V power, so the BMS can close the HV contactors (generally 2 for charging), and those may be ones requiring most power than everything else during that L1 session. To put in some numbers: maybe 3 CAN modules awaken drawing 1A each, plus those 2 HV contactors, maybe 1A each = 5Amps total, that would represent 70watts approx. This without considering if the DCDC also wakes up and your 12V battery is low and requires charging. Although this would be temporarily and as soon your 12V batt enters floatation mode, that power will be insignificant. So, in the case you would be able to do all that magic, to avoid opening the pack and bypass that HV circuitry; then you may want to have a trigger point from your PV that can ensure you will not produce less power than that 'static' required to keep those 12V modules. And still you would be at risk if the vehicle 12V batt is too low, rather than charging the HV pack, you will discharge it for maybe 20-40mins. But the good thing on this is that your 12V batt will be full now and that is the most important thing to start with. (no 12V batt, no HV even-though HV batt full). But not a grid-tie inverter, that will not work if it doesn't see a 120V since wave, you just need a 12Vdc -> 120Vac 1.5Kw continuous power inverter, powered by an additional 12V battery that is charged from your PV. That may be the most practical way, not best efficient, but easy to do method if I'm not missing something else. On Mon, May 18, 2020 at 8:39 AM Robert Bruninga via EV <ev@lists.evdl.org> wrote: I assume those conductors are not alive until the main contactor inside the battery box is activated. And once those are activated through some kind of volt software magic, the static load of powering up the system will draw more power than the 240 watts the solar panels can produce. Bob -----Original Message----- From: EV <ev-boun...@lists.evdl.org> On Behalf Of Peter VanDerWal via EV Subject: Re: [EVDL] FrankenVolt coming along... > Oh, and I still welcome anyone with info on where I can easily access > the 300V battery terminals for charging. > Maybe use vampire splice connectors on the high voltage cables to the Accessory "Power Control Module" in the trunk? _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/index.html INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... 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