72Volt controllers?

[Fort Ord]

It looks like I just fried my controller. Symptoms: Battery can charge to capacity, but the LCD reads "empty" and the bike won't move. I tested the battery output, 58V, 28A. Some voltage is getting through to the LCD though. Does anyone have a recommendation for a replacement? I use two 52V 24A batteries to power a 1500A Voilamart hub motor (30 mile round trip commute - when the first battery gets low I switch to the second. ) This just happened yesterday, and I'm in a spot since I rely on the bike. I'd be grateful for your input. My ebike is a Franken-bike, for sure, but it is my necessary ride, as I am saving for a car.

Much obliged,
rd

 

[Fort Ord]

Oops. Typo above. When I test the batteries, I get 58V 24A on both (not 28A)

 

[harryS]

Must be a title error. 52V controller?

I saw on an amazon that some Voilamarts use the SW900 LCD. Does your kit have this one? "Empty" means it doesn't turn on? You're getting battery voltage at the LCD connector?



There's a workaround for many controllers that use LCD's like this one. If you have this LCD and it's not powering up, then a lot of controllers can be jumpered to run w/o the LCD and work with throttle and a basic PAS.

Maybe you can clarify what you got.

 

[Fort Ord]

Ah. Right. This is the LCD reading with a fully charged battery attached:

 

[Fort Ord]

On the ride home yesterday, I found it off that the first battery went from 3/4 charged reading to 'empty' in a hundred yards. I switched to the second battery, got about 5 miles, then it died. This is why I'm thinking'controller'

 

[harryS]

The red means the battery is flat? Or does the yellow mean one bar of battery? And a meter says you have 58 volts on both batteries? And are these the same two batteries from this original post? If so, I'm thinking they finally gave out after six months of heavy usage.

Does anyone have suggestions for a better battery?

So, a year ago, I purchased my first ebike - a DJ mountain bike, 750W bafang rear hub motor. I installed a Voilamart 1500Watt kit, and upgraded the battery to a 52V 25AH 1500W Hailong Ebike Battery. The thing works well insofar as I get the promised MPH out of the motor. The downside is range -...

electricbikereview.com

 

[Fort Ord]

The red means the battery is flat? Or does the yellow mean one bar of battery? And a meter says you have 58 volts on both batteries? And are these the same two batteries from this original post? If so, I'm thinking they finally gave out after six months of heavy usage.

Does anyone have suggestions for a better battery?

So, a year ago, I purchased my first ebike - a DJ mountain bike, 750W bafang rear hub motor. I installed a Voilamart 1500Watt kit, and upgraded the battery to a 52V 25AH 1500W Hailong Ebike Battery. The thing works well insofar as I get the promised MPH out of the motor. The downside is range -...

electricbikereview.com

(Red-facd) You're good! Eesh.
Since then, I bought a 52v 24A battery from Matt at Bicycle Motor Works. Seems to do what he said it would do. I have the other functioning battery strapped aside the new one and make do with that. The 'yellow' on the lcd means 'out of gas'. The suddenness with this happening to both in one day points to a common factor - and the controller seems the culprit. As of five minutes ago, I put a meter on the batteries, one at a time, and got fully charged readings.

 

[harryS]

Nah. EBR stuck that old thread up at the bottom. I don't even know what day it is.

So you got close to full charge with meter, and the meter is correct? (Does it read 58V if you check one of your chargers? )

When you connect these batteries, the handlebar display lights up and says no juice. That's a puzzler. I believe the displays have their own measuring circuits though. Make sure your meter is calibrated and check it again at the display connector. Probably red/black wires.

I don't know where you can get a controller, much less the same controller, in time to make it to work tomorrow.

 

[Fort Ord]

Nah. EBR stuck that old thread up at the bottom. I don't even know what day it is.

So you got close to full charge with meter, and the meter is correct? (Does it read 58V if you check one of your chargers? )

When you connect these batteries, the handlebar display lights up and says no juice. That's a puzzler. I believe the displays have their own measuring circuits though. Make sure your meter is calibrated and check it again at the display connector. Probably red/black wires.

I don't know where you can get a controller, much less the same controller, in time to make it to work tomorrow.

Hi, thank you - I mean this - you are helping me puzzle this one out. There's nothing to be done by tomorrow. I checked the meter with a) a wall outlet for AC verification, an 18700 battery and a 1.5v AAA, and both chargers. All measure as one would expect. I'm going to order a charger from Amazon, hope for the best. I live on the Monterey Peninsula and the local bike shops don't stock much in the way of parts. Fingers crossed.