40v Ryobi e-Bike

General Discussion about electric bicycles.
Post Reply
SeakYourOwnLevel   1 µW

1 µW
Posts: 3
Joined: Jun 11 2018 5:30pm

40v Ryobi e-Bike

Post by SeakYourOwnLevel » Jun 11 2018 6:13pm

Just wanted to share my setup.

I bought 36v 10ah battery and was told tough luck when it failed... so I used my weedwacker battery. I bought a used charger to make the mount. The ryobi 40v 2.6 ah went 5 miles before it died. Kayak is 100lbs with gear. Looking to upgrade to the 5ah so I can make it 6 miles. 3 year warranty, cant beat that.

Going for stealth as the bike is left behind without the battery.
Attachments
13563-1200x1600.jpeg
13571-1024x953.jpeg
13566-1024x1366.jpeg

KalSteve   1 W

1 W
Posts: 55
Joined: Jun 18 2014 9:41pm
Location: Kalgoorlie, Western Australia

Re: 40v Ryobi e-Bike

Post by KalSteve » Jun 11 2018 7:20pm

Nice setup. Neat and tidy and very safe and useable. Great work.

docw009   10 kW

10 kW
Posts: 945
Joined: Aug 02 2015 7:43am
Location: Chicago area suburbs.

Re: 40v Ryobi e-Bike

Post by docw009 » Jun 12 2018 8:03am

I've also run my bikes off the Ryobis. Their weedwhacker is heavier than my gas model, but it always starts up. The two outer terminals of the battery carry the power, so I made a little clip to grab power and have the battery in a rack bag.

I also bought the 5AH model. but it's not high current cells, and the internal BMS trips faster than the 2.6AH model. I would not recommend it as very cost effective, unless you also have more appliances. Mine was $140 and for a bit more I could get a higher AH ebike battery, or for a lot less I could get a better performing but less safer hoverboard battery.

The EGo 52V batteries seem to have their followers.

User avatar
Alan B   100 GW

100 GW
Posts: 7492
Joined: Sep 11 2010 7:43am
Location: San Francisco Bay Area, USA
Contact:

Re: 40v Ryobi e-Bike

Post by Alan B » Jun 12 2018 8:16am

Nice setup, and welcome to ES.

Some of us are working with the similar EGO 56V batteries. They seem to have higher current cells and better heat dissipation design. Connectors can be 3D printed or recovered from chargers as you have done. The 7.5 AH packs are on sale at the moment, and the yard tools are pretty good, giving a multiple use for the batteries.

If the 5AH has the limitations reported the trick might be to parallel two of the 2.6AH Ryobi packs. That should more than double the range due to the lower current required of each.

SeakYourOwnLevel   1 µW

1 µW
Posts: 3
Joined: Jun 11 2018 5:30pm

Re: 40v Ryobi e-Bike

Post by SeakYourOwnLevel » Jun 12 2018 10:54am

From a little research it looks like they just upgraded the output on the 40v 5ah battery? The case changed removing the rubber skin. What model do you have? Does anyone know the amperage specs of the 5ah? Was looking to upgrade controller from 22 to 30 amps. I do plan to expand my Ryobi line and I only use the bike to pull the kayak.

docw009   10 kW

10 kW
Posts: 945
Joined: Aug 02 2015 7:43am
Location: Chicago area suburbs.

Re: 40v Ryobi e-Bike

Post by docw009 » Jun 13 2018 6:07pm

Let's see if this makes sense. The 5Ah battery does have more capacity, but when it's half discharged, and down to around 36-37V, blipping the throttle on a 25A controller trips the battery. It shuts down, and I have to power off the controller and pedal a bit before the pack comes back. Meanwhile, the 2.6AH battery doesn't do that. It will push 23A and does not pop off. Is it the BMS limiting the current, or less sag in the cells? I don't know, except I have to be more conservative with the 5AH battery. I don't use either as ebike batteries much these days, having moved on to other packs.

User avatar
Alan B   100 GW

100 GW
Posts: 7492
Joined: Sep 11 2010 7:43am
Location: San Francisco Bay Area, USA
Contact:

Re: 40v Ryobi e-Bike

Post by Alan B » Jun 14 2018 9:16am

Are there any Ryobi tools for these packs that draw this level of current (25-30A)?

Operating within the pack design goals is the best plan.

docw009   10 kW

10 kW
Posts: 945
Joined: Aug 02 2015 7:43am
Location: Chicago area suburbs.

Re: 40v Ryobi e-Bike

Post by docw009 » Jun 14 2018 6:00pm

I tried the 5AH again on my 20A KT sinewave controller bike. That maxes out at 20A per my wattmeter. It seemed pretty good. I had used 1.3 AH and down to 38.9V when I swapped the battery back to my bike with the 25A controller. First time I hit throttle, the battery tripped. I was also mistaken. It doesn't reset until I unplug the connectors.

Unfortunately, my wattmeter loses the I-peak and Vmin when the battery shuts off, so I'll have to rig it up with a aux battery if I want to see what the meter recorded.

I would say the 5AH pack is OK if you keep the peak currents under 20A.

User avatar
Alan B   100 GW

100 GW
Posts: 7492
Joined: Sep 11 2010 7:43am
Location: San Francisco Bay Area, USA
Contact:

Re: 40v Ryobi e-Bike

Post by Alan B » Jun 14 2018 6:12pm

The 25A controller may have a short-term current higher than 25A. If you temporarily power the meter with a separate battery you might be able to get a reading, though short term readings are not always trustworthy. The voltage dip is probably the real issue however.

docw009   10 kW

10 kW
Posts: 945
Joined: Aug 02 2015 7:43am
Location: Chicago area suburbs.

Re: 40v Ryobi e-Bike

Post by docw009 » Jun 15 2018 3:13pm

Put the aux battery on my RC wattmeter. Same bike and controller. The 5AH pack will trip right around 25A when I call for max power with throttle. The 2.6AH pack maxes out around 22A. The little pack doesn't put out enough current to trip its own BMS, but the 5AH will.

Explains why the 5AH is so irritating. Keep the load low with a small motor and it will run on.

BYqSXt8Z   10 W

10 W
Posts: 84
Joined: Jul 03 2014 8:29pm
Location: GTA, Ontario, Canada

Re: 40v Ryobi e-Bike

Post by BYqSXt8Z » Apr 14 2019 7:15pm

How did you go about "waking up" the battery? The bms doesn't let me read the full voltage when I'm just poking at the battery.

docw009   10 kW

10 kW
Posts: 945
Joined: Aug 02 2015 7:43am
Location: Chicago area suburbs.

Re: 40v Ryobi e-Bike

Post by docw009 » Apr 15 2019 7:20pm

BYqSXt8Z wrote:
Apr 14 2019 7:15pm
How did you go about "waking up" the battery? The bms doesn't let me read the full voltage when I'm just poking at the battery.
I had forgotten that it can go into a sleep mode. I just probed my Ryobi after it sat all winter, and it wanted to read 18V.

Plugged it into my ebike and the LCD said it was OK and reading 40V. Pulled it off the bike. Now at 40V. I guess you get it out of sleep mode by plugging it into a charger or your tool.

Two outer terminals. The polarity is marked.

Post Reply