[Dprglist] Ryobi battery packs

[secretary at dprg.org]

John,
    Is there any type of name plate on the mower that gives voltage, amps,
watts or similar information?
- Doug P.

On Tue, Jun 8, 2021 at 3:05 PM secretary at dprg.org <secretary at dprg.org>
wrote:

> 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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