oatnet wrote:BTW, the single-cell vicors I got weren't the 3.7v 4.2a supplies, they are 48v to 3.7v/20a DC-DC converters. 20w loss on the conversion (22%) is a bit much for regular charging, but they ought to make nice balancers.
GGoodrum wrote:One other thing you might consider eventually adding is a cell-level LVC board that will trip a controller input to cut the throttle if any one block of cells dips too low. I know you plan on not discharging below like 20%, but why I think it is still important is that if a cell does go bad, the problem is that it will try and drag down the other cells in parallel with it, so you could end up with a whole bank of dead cells.
eric wrote: Have you considered the potential need for battery (or motor) cooling?
Are you going to include a rain or dust shield underneath the motor?
dogman wrote: Here's where I'm ignorant, but the electric motor could quite possibly weigh almost as much as the gas one did.
To boost range just a few miles, maybe a 2000 watt generator would fit in the engine bay?
I'm impressed with the progress you've made on this project in such a short time. I'm in the late planning stage of a conversion myself and a little daunted by the work ahead so it's great to read your detailed record and see all the pieces coming together.
I have a question though. I see you have three contactors Ã¢â‚¬â€œ two Kilovac EV200 and an Albright. Most people seem to recommend one on the positive side and another on the negative side so that you can completely isolate the pack, but what's the third one for? Is it just added redundancy? Nothing wrong with that of course, I'm just curious.
You've packaged brake servo pump very neatly there. I realise that's partly to muffle noise from the pump and you've probably already thought this through, but isn't there a risk the pump could overheat inside that box if it draws a lot of power?
voicecoils wrote:oatnet wrote:Can anyone tell me, if I put my multimeter on the ends of an individual cell, will I read the voltage of that cell, or the voltage of the entire supercell?
Yes, you can measure the potential (voltage) across any individual cell, regardless of how it is connected to other cells. Just jump in with a multimeter.
You can also charge or discharge any individual cell in the same fashion, while connected to the others. The circuit (say the multi-meter with probes on each end of one cell) is only 'closed' around that cell, so that's all it sees.
Malcolm wrote:Sounds like you've got every angle covered.
Malcolm wrote:I didn't know that about the EV200 needing additional heat sinking when handling higher currents. I just picked up a couple of them myself, so I'd better read the data sheet... I'd guess they're talking about 500A continuous though, so there should be some headroom there.
markcycle wrote:Wow looks good can't wait to see the maiden voyage.
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