07-25-2020, 08:23 AM | #11 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Chevy Volt / Navitas AC - New Build
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My RoyPow, on the other hand, has essentially no detectable fade (flat voltage curve through most of the pack's capacity). To be fair, I've only run it down below 30% once or twice, when range testing, and I didn't push it too hard with acceleration or WOT runs when in this SOC, but the range on this pack is so much greater than my FLA pack that by the time I hit 30% SOC I've likely already traveled 30-35 miles. Generally my longest trips between charging are no more than 20 miles max with 10-12 being the norm, and being able to charge at about 10mph means short charge sessions are productive. |
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07-25-2020, 12:00 PM | #12 | ||
Gone Wild
Join Date: Mar 2013
Location: Santa Cruz, Californnistan
Posts: 326
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Re: Chevy Volt / Navitas AC - New Build
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07-25-2020, 12:03 PM | #13 | |
Gone Wild
Join Date: Mar 2013
Location: Santa Cruz, Californnistan
Posts: 326
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Re: Chevy Volt / Navitas AC - New Build
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07-25-2020, 12:58 PM | #14 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Chevy Volt / Navitas AC - New Build
Quote:
One thing to think about (that I didn't think about) is that the ride becomes a lot more stiff when losing all that weight. I ended up removing the front helper leaf on my lifted Onward, and running fairly low air pressure. It was never an issue on a smooth street, but even expansion joints on paved paths or roots on the golf course were jarring. Considerably better now, but still not quite what it was before. |
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07-25-2020, 01:36 PM | #15 | |
Gone Wild
Join Date: Mar 2013
Location: Santa Cruz, Californnistan
Posts: 326
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Re: Chevy Volt / Navitas AC - New Build
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07-25-2020, 03:25 PM | #16 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Chevy Volt / Navitas AC - New Build
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07-27-2020, 04:01 PM | #17 | |
Gone Wild
Join Date: Jan 2013
Location: Saint Petersburg, FL
Posts: 2,089
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Re: Chevy Volt / Navitas AC - New Build
Quote:
So if you have 12 cells in series, you will start at 49.8V and need to recharge at 39v. In contrast a lead acid pack starts at 50.7V and needs to recharge at 48V. So the lithium cells span a 10V range from full to dead whereas the lead acid spans 2.7V. The lithium is much more linear (until it gets to the 'knee'). The benefit of the lithium is that you are not limited to 12 cells. If you put 13 cells in series you have 53.95V charged to 42.25V discharged. If you go with 14 cells you have 58.1V to 45.5V. I have 14 cells and choose to only charge my pack to 57.6V (4.11vpc) to increase the life of the pack. Also, lithium has lower internal resistance so when you mash the pedal the voltage will sag, but much less than lead acid. This means you will accelerate faster. Also lithium weighs a lot less, so you accelerate faster. If I were to recommend a person who is starting from scratch, I'd recommend going with a higher voltage pack if your controller can handle it. Supposedly the Navitas will handle 100V so it will handle a lot more cells than you have. a 20S pack won't be an issue for that Navitas. The last thing I want to say is that you are switching to AC. AC carts behave a lot differently than DC carts. My cart is a DC cart. So you may see no issues from a 49V pack vs a 57V pack. |
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07-29-2020, 04:38 PM | #18 | |
Gone Wild
Join Date: Mar 2013
Location: Santa Cruz, Californnistan
Posts: 326
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Re: Chevy Volt / Navitas AC - New Build
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07-29-2020, 08:27 PM | #19 |
Gone Wild
Join Date: Mar 2013
Location: Santa Cruz, Californnistan
Posts: 326
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Re: Chevy Volt / Navitas AC - New Build
Got my CA plates last week. Title came in the mail today. :-)
Got the 5kw Navitas motor mounted up today. It fit...BARELY. There were a few challenges. The jakes top spring plate that has the shock mount barely clears the lower corner of the motor. The factory shock is no lonnger viable as is. I flipped it over but the housing still rubs on one of the electrical connectors on the motor case. I'll either make a new upper spring plate that moves the lower shock mount rearward, or just completely change up the shock situation with the new rear suspension I fab up. Not sure if I'm gonna do a 4 link or just radius arms and a panhard rod. After getting the motor in and seeing how things sit I'll probably do a 4 link as it will be easir in the end. I have 20ft of 1" .065 wall tubing waiting for me at the metal supply along with a sheet of .063 aluminium sheet. The tubing is for the suspension. Sheet is to enclose the battery compartment. It's gonna be REAL hard to not jusr rush to get it running. I want soo badly to see how it runs, but I'm gonna take my time and put it together nice and clean. |
07-30-2020, 07:05 AM | #20 | |
Gone Wild
Join Date: Oct 2019
Posts: 646
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Re: Chevy Volt / Navitas AC - New Build
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I hear 'ya on both counts! I put my motor in by myself, from underneath, with the (lifted) cart not jacked up. Somewhat challenging - the thing's a beast. |
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