Charging System Question For 86-89 700/750 Owners...

I've got this nifty new battery for my 700 project, but it can't be charged at more than 14.4-14.5v.

Can someone please tell me what the charge rate typically is on their 86-89 VFR 700/750 at ~5000rpm?

Thanks!

If it is higher than 14.4-14.5v, I'll have to rig up some kind of secondary regulator in line with the original!

 

13.5 to 14v should be about average normal charge.....

 

Can I get a confirmation?

I will probably start running the bike with a regular battery and a voltmeter anyway, to be 100% certain. I really don't want to fry these lithium iron phosphate cells!

 

squirrelman might be nuts Seb...but he is one of the guru's......... his word is closer that spot on

Crusty

 

Good news so far... anyone else? I'll take all the observations I can get! Never can have enough data!

 

Confirmed. Squirrel is nuts.
I have an 87 700 F2
@ 5K RPM i see ~ 13V DC to 14V DC
@ 7K RPM i see ~ 14.5V DC to 16.1V DC

Your battery needs 11.5 to 12.5 V DC to crank... minimum of 10 Amps.

When you press start button, to turn over enginer, battery should not go below 11.0V DC. If it does, replace it.

http://vfrworld.com/forums/mechanics-garage/22254-ghost-says-lets-learn-about-batteries.html

 

Thanks a bunch. I have an 8 cell pack wired up 4s2p, it's about the size of a can of soda and weighs maybe 1.5lbs.

Anyone else?

 

afternoon bump...

 

Squirrel's nuts

I do believe you are overthinking this just a wee bit........Squirrel is on the money on this.

 

I'm overthinking it, because at the moment I have quite a bit of money tied up in this experimental battery, and the bike I am building is not in running order right now.

I've made a battery from 8 lithium iron phosphate cells taken from a DeWalt 36v battery pack, and have them assembled in a 4s2p configuration. If they get charged at more than 14.5v, I risk frying them and tossing my money out the window.

So, if I could get a handful more people to chime in with some more data, that would be great! Never a bad idea to check your bike and see what the charging system is up to anyway! :thumbsup: