4 of these units could add 8 kw demand and 10kwh to EV only use, I have little experience with Prius batteries. opinions? Voltage controlled to maintain %80 charge you could add as many as you could fit. Basically a dc to dc converter add a bridge diode to the ac and let them run. When soc gets low the inverter turns on. I am a retired electronic tech, I've got 4 weeks with a 2006 Prius. I will drive this for a few years then upgrade, that should give me time to learn what to upgrade to.
sounds like a lot of missionary work. it can and has been done, but only by the best and brightest. all the best, please keep us posted!
I just learned however that the 2019 and up RAV 4 uses a DOUBLE battery pack. Looks like it maybe may be two Prius c packs together. Very exciting and wondering if any coding or adapting can be done. Or possibly even copying it. Because Toyota has proven that we’re not crazy to think two nimh batteries can work.
Toyota is not in the business of proving the presence or absence of insanity, that is not their profile. Is adding a second battery possible? | Page 6 | PriusChat
Yes, thank you I am aware my information about the two battery was wrong. It is hardly common knowledge. But again I appreciate your help in enlightening myself and the whole internet community!
17 12.8v 100ah lifepo batteries for auxiliary traction motor 2006 prius, connected through a 200A diode. This would act like an auxiliary battery, it would not charge while driving, just supply current when the main battery is lower in voltage. You would charge at home, 20h at 5A on a single 15a cord. the aux battery can supply 100A at 200-240v but mostly at 210 to 220, so it would only contribute at 50 to %80 soc/main bat. this would cost $2k and use all of the spare tire space+ more, for a car that only does 40mph in ev mode. but it could drive 30-40 miles between charges. It would not be cost effective for a gen 2 but might be for gen 4
An enable switch wired to the ignition, would automatically disable through a contactor, add a charger interlock so it could not be charged while connected to the main battery. When disabled the car would run normal, even when enabled regen will work, but it only works with the NMH.
The gen 4 has a lithium option that IS NOT the Prime model. Looks kind of like the gen 4 pack from the outside, though Lithium on the inside. I haven't researched much other than the little I did for the PiP in a gen 3. Would be interesting to see how to fit the Prime pack or maybe the earlier 13-15 years PiP which is like half the capacity, in a gen 3 or gen 2. Though when researching, like I said, I found there is a Lithium option for the gen 4 that is not the Prime and more like the NiMH pack though in Lithium. Offhand thinking, could easily spoof the gen 2 HV Battery ECU sense wires. Though would want to be critical of the pack design so the NiMH inverter-converter PCU wouldn't damage the pack or be damaged. Seems an aftermarket bluetooth BMS for the number of cells used as well would be ideal at the least, so can have a heads up display of the performance and be safe regarding. I am seeing the Nissan Leaf's in the yards as well and debating grabbing more parts off of for a potential design or for those in need. I did grab the plug in charger, which is neat seeing and versatile potentially in the future. Prob can read into and grab the battery charger assembly as well and see what other parts are worth getting.
You know, not a lot, though am learning more these last few weeks. However, @mudder has been moving forward with his LiBCM LiBSU design for the gen 3 and plans to have the option for a gen 2 in time. Search around for his name, the Linsight and related posts here on Priuschat. From my perspective, I now have options being I have three gen 1 Prius PHV-Pip 56 cell (4 14S bricks) HV packs just sitting around. I'll be able to use one pack for new cells and have two packs for not exactly certain just yet, maybe PriUPS and Lithium conversion or off the grid use. These gen 1 plug in Prius packs spec out close to the 28 module (168 cells) NiMH HV packs. Charge discharge profiles are different which makes a little challenging for Delta SOC % metric appears. So far I plan initially to make an extension pack for my OUPES Mega 1 with one of the pack bricks, being the 14S brick mates up well as long as I have the charges for each close so to avoid inrush current issues and avoid a precharge circuit implementation in with the design. I ordered two BMS to study different designs, a Daly and JBD. So far the JBD arrived and I am waiting on the UART hardwire display. I plan to have a breaker, LED display for metrics and for now probably only a XT90 connection to test with. Next up, for the LED display and processing data regarding metrics, I think I'll use the Circuitmess Spencer I picked up from a Goodwill store and go the ESP-WROOM-32 route where can have a few options with the open GPIO's for sniffing with a CAN bus transceiver module to ultimately replace the HV battery sense module and for starters more easily spoof the 56 cell sense wires into the stock HV battery sense computer module. Though first I need to go through the single 14S say JBD BMS extension pack design safely where I'll input the data to the ESP32 and process so to output best safely what the 14 block 28 module NiMH would look like while safely using the 14S Lithium NMC bricks. Once I am confident with inputting, processing and output data on one brick, I can move forward with all four Once I can input the sense variables and process the outputs for the NMC cells, I can go from there to sniffing and spoofing the stock hv sense computer and completely replace. Will see how far I get. Though that is the plan being the plug in Prius hv sense module is so damn picky and goes open circuit useless if any issue seems with the lithium NMC hv pack. I literally have four bad ones that I can scope around to see what part fried and possibly repair if able. However, would be nice to have a drop in replacement with more options for more chemistries too. For now, thinking I'll just use four (14S each) or maybe three (~20S each) existing smart BMS so can get the data in more than one way (bluetooth, Wifi, UART), though I prefer hardwired with displays for on the dash and maybe another for in the rear. Amazing the potential options seeing 314ah LiFEPO4 cells out as well. That's huge compared to the little 22ah NMC I have.
