# MB-1-E Part Eighteen: The Test Flight

### Re: MB-1-E Part Eighteen: The Test Flight

Dave,

I use odyssey batteries. On my owner's manual it states that ll.5 volts is dead. 11.7 volts is 10% charge.

I re-read all of your blog again today, I think I finally got it right, you have a doc Watson meter.

Is'nt there a way this can be hooked up without running all of the battery voltage thru it? Even if you could monitor one battery I think it would be helpful.

A meter at this time for me would be just for asthetics, I never tax my battery pack, being in the city I pretty much know how far I have to go. About the furthest I have gone is 10 miles on a trip before the batteries are on a charger.

OK,
Is that Doc Watson not usable?

Chuck

[b]AGM BATTERIES[/b]

### Re: MB-1-E Part Eighteen: The Test Flight

The Doc Wattson has a 100A limit.
In order to use the Ammeter (thus determining my Ah use) is to place it in line between a source and a load. (i.e. The Battery and the Controller or the Controller and the Motor.

The problem being that my motor draws more than 100A at times.

Now I could use it when I charge the batteries also where the Charger is the Source and the Battery is the Load. This will tell me how many Ah until a full charge. This could give me a good idea of how much the batteries have been depleted.

As I've noted, I don't plan on depleting the batteries this low on any kind of regular basis.
I didn't have a volt meter on me.
Now I know what my limits are and don't plan on going past 50% if possible.
I know that draining the batteries past that will shorten their life considerably, I need them to last as long as possible (within reason).

I can place the Doc Wattson meter on one bank of the batteries just to determine voltage, so this would be a good gas gauge.

You posted it once before (I don't remember where), but what does your Odyssey manual list as Full, 3/4, 1/2, 1/4, if it does list it this way?

I had no idea I was getting the batteries down to ~2% left today or I wouldn't have done so.

I'd better get a volt meter on it!

Hopefully, I didn't hurt them too bad. I noticed that they went right up to 13 volts within about 10-15 minutes on the charger.

Oh, after 17+ miles of all out riding, the motor was a little hot but not too bad. I could hold my hand on it (pressing down) for 10 seconds before I really felt like taking my hand off. So I think the motor can handle that type of ride fine.

I can tame down the controller current draw a little so it's a bit easier on the batteries.
I also don't need to go 20 mph most of the time either. No traffic issues where I need to.

Dave

MB-1-E
Electric - Bridgestone MB-1 Mountain Bike
Icon Photo of lighning striking Eiffel Tower Jun 3, 1902, taken by MG Loppe'

Dave B

MB-1-E
<a href="http://visforvoltage.org/book-page/996-mountain-bike-conversion-24v-3-4h... - Bridgestone MB-1 Mountain Bike</a>

### Re: MB-1-E Part Eighteen: The Test Flight

Dave,

Per the odyssey manual,

As long as the battery has not been charged or discharged for 6 or more hours, these figures can be used to determine the state of charge of the battery. 12.84 volts or greater-100%. 12.5 volts-75%, 12.18 volts-50%, 11.88 volts-25%.

chuck

[b]AGM BATTERIES[/b]

### Re: MB-1-E Part Eighteen: The Test Flight

Thanks Chuck,

Exactly what I needed.
I can set my controller for 12.18 volts for the low end and keep the batts within that golden 50% level.
Actually, I don't even want to take them that low most of the time but this will prevent me from going any farther if I do.
I think the controller must go into a reduced current state after that point, so perhaps I need to set it slightly higher than this. I noticed a rather abrupt reduction in speed and power but it still got me home fine.

Knowing this and adding my Doc Wattson as a Voltmeter should do the trick.

Thanks again,

Dave

MB-1-E
Electric - Bridgestone MB-1 Mountain Bike
Icon Photo of lighning striking Eiffel Tower Jun 3, 1902, taken by MG Loppe'

Dave B

MB-1-E
<a href="http://visforvoltage.org/book-page/996-mountain-bike-conversion-24v-3-4h... - Bridgestone MB-1 Mountain Bike</a>

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