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by Jeremy
Wed Mar 09, 2011 7:53 am
Forum: All things battery related
Topic: Think I've overfilled my VRLAs
Replies: 16
Views: 15957

Re: Think I've overfilled my VRLAs

You're right, that manual is a laugh a minute! I would leave them as they are and not try to remove any electrolyte. The excess water will gradually vent out as gas and return the electrolyte to the correct strength. If you remove some electrolyte then the battery will always be running with electro...
by Jeremy
Sat Mar 05, 2011 9:48 pm
Forum: Electric Motor Bikes
Topic: New to EV motorbikes
Replies: 72
Views: 61662

Re: New to EV motorbikes

I still have the whole lot, a new and unused ME0709, a new and unused Alltrax controller, a new and unused Albright contactor and a spare brush card for the motor. The controller and contactor are 48V units, which will limit the motor maximum power to about 14.4kW (about 19hp). They will work up to ...
by Jeremy
Sat Mar 05, 2011 8:52 pm
Forum: Electric Motor Bikes
Topic: New to EV motorbikes
Replies: 72
Views: 61662

Re: New to EV motorbikes

My ME0709 is still available if you want it..............

Jeremy
by Jeremy
Sat Mar 05, 2011 7:42 pm
Forum: Electric Motor Bikes
Topic: New to EV motorbikes
Replies: 72
Views: 61662

Re: New to EV motorbikes

These motors look like the lower power version of the Mars Electric ME0708. I have a feeling they are motors that were made by Mars Electric for a specific project and which are now surplus. They are a lower power version of the motor I originally fitted to my RD50MX project bike, the Mars Electric ...
by Jeremy
Fri Mar 04, 2011 12:10 pm
Forum: Electric Motor Bikes
Topic: New to EV motorbikes
Replies: 72
Views: 61662

Re: New to EV motorbikes

They are both very tiny motors, barely powerful enough for a bicycle, really. Diameter and length are always good clues as to likely torque output, the smaller of these is 57mm in diameter, the larger is 90mm in diameter. A Lynch motor of the power you're looking for is 205mm in diameter. Looking at...
by Jeremy
Wed Mar 02, 2011 1:05 pm
Forum: All things battery related
Topic: Watering SLAs?
Replies: 10
Views: 13442

Re: Watering SLAs?

These are indeed wet maintenance free batteries, although the "sealed rechargeable battery" wording is a bit dubious, so I can see where the confusion arose. I think just keeping the electrolyte level at the plastic thing is the right thing to do, although because they are maintenance free...
by Jeremy
Wed Mar 02, 2011 11:33 am
Forum: All things battery related
Topic: Watering SLAs?
Replies: 10
Views: 13442

Re: Watering SLAs?

It sounds as if these aren't SLAs, but ordinary wet cell low maintenance batteries, if the supplier recommends topping up. The difference is that SLAs use a gel electrolyte and can't be topped up, whereas low maintenance batteries use an ordinary liquid electrolyte and can be topped up. The SLAs are...
by Jeremy
Wed Mar 02, 2011 7:35 am
Forum: All things battery related
Topic: Watering SLAs?
Replies: 10
Views: 13442

Re: Watering SLAs?

It isn't normal practice to remove the sealed emergency over-pressure vents and try to add water to a sealed lead acid battery, primarily because there is no way of being able to mix added water to the fairly thick internal electrolyte gel - the water will just sit on top of it, diluting the top sur...
by Jeremy
Fri Feb 25, 2011 7:36 am
Forum: All things battery related
Topic: charging at work
Replies: 12
Views: 13383

Re: charging at work

As a (now retired) "boss" I can put another perspective on this, perhaps, but not directly from a battery charging perspective. Many years ago I was sent North to manage an establishment in a remote rural area, with no public transport links to the workplace. For many years a minibus had b...
by Jeremy
Sat Feb 19, 2011 12:10 pm
Forum: Electric Motor Bikes
Topic: New to EV motorbikes
Replies: 72
Views: 61662

Re: New to EV motorbikes

I had a few "Blue Peter" moments, too, as I also mocked up most of the parts in cardboard and then struggled to see how I could fit them in the space available within the frame. I think this process is really the true meaning of CAD: "Cardboard Aided Design". I still have some ho...

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