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Unread 01-14-2020, 01:11 PM   #1
dougrobling
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Join Date: Jan 2019
Location: Knoxville TN
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Default 72V AC Drive Precedent Progress

I think everything is ready now. (Just waiting on the battery arrive) They sent me a picture of it before it was loaded on the boat, and it should be here in three or four weeks now....

Motor, controller and all wiring is complete. Battery mounting bracket built and in place. New body, lights, and disc brakes are installed. It ran really well with the old 48V lead-acid batteries, so I can't wait to try it with the new set-up.
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Unread 01-16-2020, 07:45 AM   #2
fstop
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Default Re: 72V AC Drive Precedent Progress

Quote:
Originally Posted by dougrobling View Post
I think everything is ready now. (Just waiting on the battery arrive) They sent me a picture of it before it was loaded on the boat, and it should be here in three or four weeks now....

Motor, controller and all wiring is complete. Battery mounting bracket built and in place. New body, lights, and disc brakes are installed. It ran really well with the old 48V lead-acid batteries, so I can't wait to try it with the new set-up.
What battery is that you are using, and do you have a link to specs / cost etc?

72v is the way to go I think with the Navitas AC setup - should (as I understand it) produce the most efficiency in terms of miles / wh used, esp. at higher speeds.
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Unread 01-16-2020, 07:53 PM   #3
dougrobling
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Default Re: 72V AC Drive Precedent Progress

Here is the spec on the battery. It is 72V, 120aH, and includes a voltage reducer for my 12V needs. The price was about $1,800 plus about $400 to ship it here.
I think I ďover-specedĒ it with the 200A battery management system, as I donít believe current draws will be nearly that high on a consistent basis (especially at 72V). I will data log the current draws when itís in and installed. You would probably be fine saving some money by reducing the BMS or maybe even the aH, but I just didnít want to spend a bunch of money and come up short, so I tried to error on the high side...
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Unread 01-16-2020, 10:06 PM   #4
fstop
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Default Re: 72V AC Drive Precedent Progress

Quote:
Originally Posted by dougrobling View Post
Here is the spec on the battery. It is 72V, 120aH, and includes a voltage reducer for my 12V needs. The price was about $1,800 plus about $400 to ship it here.
I think I ďover-specedĒ it with the 200A battery management system, as I donít believe current draws will be nearly that high on a consistent basis (especially at 72V). I will data log the current draws when itís in and installed. You would probably be fine saving some money by reducing the BMS or maybe even the aH, but I just didnít want to spend a bunch of money and come up short, so I tried to error on the high side...
That sounds like a good price for that AH and voltage. Will be interested to see the product when you get it and learn about performance etc...

Please keep us posted.
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Unread 02-12-2020, 06:32 PM   #5
dougrobling
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Default Re: 72V AC Drive Precedent Progress

The battery is here and installed. Everything is back together, but is raining big time so I canít check out the performance......🙁
Hopefully tomorrow will be a better day!

It looks good. Very solid, and was exactly the size requested so it fit my pre-welded frame exactly. Plenty of room on one end for the controller and the other end for the charger and an extension cord. I bought a 115vac plug for an RV and installed it where the old charger connected for easy charging from any outlet.
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Unread 02-12-2020, 07:27 PM   #6
Nolagt
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Default Re: 72V AC Drive Precedent Progress

Quote:
Originally Posted by dougrobling View Post
The battery is here and installed. Everything is back together, but is raining big time so I canít check out the performance......🙁
Hopefully tomorrow will be a better day!

It looks good. Very solid, and was exactly the size requested so it fit my pre-welded frame exactly. Plenty of room on one end for the controller and the other end for the charger and an extension cord. I bought a 115vac plug for an RV and installed it where the old charger connected for easy charging from any outlet.
Please post some vids, that looks like it should be pretty fun with that battery.
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Unread 02-14-2020, 06:53 AM   #7
dougrobling
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Default Re: 72V AC Drive Precedent Progress

So I set the max speed at 40 and took it for a spin. Wow, it gets to 40 right away and even maintains it going up slight inclines. It only slowed down to 34 on the steep inclines. Don’t know about range yet, but I drove it about 6 miles and it has only dropped .2V of charge.

I’m debating setting the limit higher temporarily just to see what it would do, but the windshield is bowing in quite a bit at 40....
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Unread 02-14-2020, 11:02 AM   #8
fstop
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Default Re: 72V AC Drive Precedent Progress

Posted some ?s in your other thread - not sure which one you are going to continue your details in so I'll monitor both.

Very interested in your results and any little details you can provide.

I wen't with a RoyPow battery but knew a 72v solution would be better, but wasn't quite ready to do the China thing. So very curious about your experience not only with the performance and charging, voltage sag under acceleration, etc... but also the buying (and waiting) experience and what type of comfort level you have / had with the seller.

What charger are you using? - Dump some details man!
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Unread 02-14-2020, 06:51 PM   #9
dougrobling
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Default Re: 72V AC Drive Precedent Progress

I am attaching shots captured in a romp through the neighborhood this afternoon.
Donít have many straights and a lot of up and down so you will see it swing back and forth to 40mph and 200A draw...
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File Type: jpg 5E5D48E9-B9D7-43AD-9BA9-986F0C3BAB3A.jpg (76.1 KB, 0 views)
File Type: jpg 1F837F81-F067-4687-8BFC-5CC6193B4E00.jpg (92.9 KB, 0 views)
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Unread 02-14-2020, 07:35 PM   #10
dougrobling
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Default Re: 72V AC Drive Precedent Progress

I forgot to attach the battery voltage screen grab that goes with the two above...
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