[Dprglist] Ryobi battery packs

[secretary at dprg.org]

John,
     That run time changes things for sure. 6Ahr / 30 minutes = 12A running
current or (12 x 40 = 480 watts) 2/3 hp. Thanks for the info.
Regards,
Doug P.

On Tue, Jun 8, 2021 at 1:11 PM John Gauthier via DPRGlist <
dprglist at lists.dprg.org> wrote:

> I have a Ryobi RY401015 mower.  It has not one, but two 6 Ahr batteries.
> Both batteries can be inserted into the mower, but only one is used at a
> time (selected by inserting a "start key" in one of two positions -- it's
> really just a shunt).  The advertised 70 minute mowing time comes from
> depleting one battery, then the other.  So one battery only gets you about
> 30 minutes mowing time under average conditions.  Mowing time decreases
> with grass height and use of the self-propelled feature.
>
> John G.
>
> On 6/8/2021 9:59 AM, John Swindle via DPRGlist wrote:
>
> One mower is too dirty to read anything on it such as faceplate. One is
> still in its box which says "13 amps". But I don't see a wattage or VA
> number. So, I don't know if its 13 reactive amps that don't draw power, or
> 13 amps like a space heater. Not going to tear into the box just yet.
>
> I've never used a battery-powered mower.
>
> A Kill-a-Watt would be nice to see what's really happening, but I've
> noticed that watt meters from different vendors display radically different
> results depending on the load's reactance. Even Kill-a-watt can be fooled
> to report no power being drawn.
>
> Best to you,
> John Swindle
>
>
> -----Original Message-----
> From: Doug Paradis <paradug at gmail.com> <paradug at gmail.com>
> To: John Swindle <swindle at compuserve.com> <swindle at compuserve.com>
> Cc: dprglist at lists.dprg.org <dprglist at lists.dprg.org>
> <dprglist at lists.dprg.org>; jjbrockm at gmail.com <jjbrockm at gmail.com>
> <jjbrockm at gmail.com>
> Sent: Tue, Jun 8, 2021 9:01 am
> Subject: Re: [Dprglist] Ryobi battery packs
>
> John,
>      Good to hear from you as always. My calculation was based on internet
> reviews of run time. I may be misunderstanding the battery's specs. They
> call it a 40V, 6A battery. I made the assumption that what they meant was 6
> Ahr. If they mean the output is 40V at 6A that would be 240W (~1/3 hp), and
> a capacity of 9Ahr for 1.5 hours of life versus the 160W (~0.21 hp) I
> initially estimated. However they sell the batteries in terms of 40V/2A,
> 40V/4A, 40V/6A, so I think my original assumption that the "A" value is
> really Ahr is likely correct. Have you ever owned a battery power mower? I
> know the Ryobi mowers use brushless motors and very thin light weight
> cutting blades. Would you share the wattage or volt/amp values from your
> mower's faceplate? It would be interesting to know what values to expect.
>
>     You have made me curious, next time I'm in Home Depot, might look over
> the electric mowers' faceplates. It is frustrating how the adverts and
> mower websites never really tell you anything.
>
> Regards,
> Doug P.
>
> On Tue, Jun 8, 2021 at 7:42 AM John Swindle via DPRGlist <
> dprglist at lists.dprg.org> wrote:
>
> Is 160w enough to mow? I think corded electric mowers draw more than a
> kilowatt. Never measured it, but labels say big amps. (I've only ever owned
> electric mowers for 40 years. Don't last more than about 100 running hours,
> so I've had several.)
>
>
> -----Original Message-----
> From: Doug Paradis via DPRGlist <dprglist at lists.dprg.org>
> To: jesse brockmann <jjbrockm at gmail.com>
> Cc: DPRG <dprglist at lists.dprg.org>
> Sent: Tue, Jun 8, 2021 7:29 am
> Subject: Re: [Dprglist] Ryobi battery packs
>
> Jesse,
>     Looking at reviews of the battery it seems a fresh 40 volt 6Ahr
> battery put in an electric lawn mower lasts about 1.5 hrs. This means that
> the draw for its intended use is 4A (i.e., 160W)..
>
> On Mon, Jun 7, 2021 at 12:40 PM jesse brockmann via DPRGlist <
> dprglist at lists.dprg.org> wrote:
>
> What I wonder is what the current ratings of a Ryobi pack like this is?
> Can I draw 10c?   😀😀
>
> On Mon, Jun 7, 2021, 12:33 PM Doug Paradis via DPRGlist <
> dprglist at lists.dprg.org> wrote:
>
> Murray and Harold,
>           Thought you might enjoy this.
> https://hackaday.com/2021/06/07/ryobi-power-packs-as-ebike-batteries/
>
> Regards,
> Doug P.
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