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Old 12-16-2020, 03:42 PM   #11
dougrobling
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Default Re: 105 AH vs 160 AH

Typical continuous draw at 72V is just under 120-200A
(But that is cruising down the street at 35-40mph )
After experimenting with draw limits, I have actually set my limit at 200A and have no trouble maintaining 40mph on the flat and only dropping to 37 or so on the steeper hills.
You may not intend to drive that fast, but since you are only at 48V I would say that you would need AT LEAST 200A continuous available....
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Old 12-16-2020, 03:47 PM   #12
ThreeCW
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Default Re: 105 AH vs 160 AH

Quote:
Originally Posted by dougrobling View Post
Typical continuous draw at 72V is just under 120-200A
(But that is cruising down the street at 35-40mph )
After experimenting with draw limits, I have actually set my limit at 200A and have no trouble maintaining 40mph on the flat and only dropping to 37 or so on the steeper hills.
You may not intend to drive that fast, but since you are only at 48V I would say that you would need AT LEAST 200A continuous available....
As a comparison to Roypow, which batteries are you running and what are their amperage ratings?
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Old 12-16-2020, 03:52 PM   #13
dougrobling
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Default Re: 105 AH vs 160 AH

I am running a set of (24) 120aH LiFePO4 batteries I purchased from China (nominal of 72V, charge to 86V) The BMS is rated at 200A continuous and up to 400 for 20 seconds. Victron SOC meter....
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Old 12-18-2020, 01:08 PM   #14
Nutshell
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Default Re: 105 AH vs 160 AH

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Originally Posted by ThreeCW View Post
Keep in mind the regular Roypow battery packs are only rated for 100 amps continuous discharge and 200 amps for a 10 second maximum discharge. This includes both the S51105 and S51160 Roypow packs.

I don't believe that the Roypow performance packs are available yet, but the S51105P and the S51160P Roypow packs are rated at 105 amps and 160 amps continuous discharge respectively. Both P packs have a 315 amp maximum discharge rate for 30 seconds.

Not only do you want to concern yourself with the amp-hour rating, but you also need to consider the discharge ratings of the battery offerings. I believe that your Navitas controller is rated for 440 amps ... I don't believe that you will want your battery pack to be the weak link in your system.

Do you know what your present amperage draws are for your various driving situations?

I suspect that your only choice (amperage wise) may be to wait until the S51160P pack becomes available.

See Roypow technical specs at the bottom of this page: https://www.roypowusa.com/?page_id=26237#bit_bzgti
Make a lot of sense. Thanks so much for the insight.
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