Satiator says 56.5v, CA3 54.5v, Baserunner 63.6v

Built Ezee front hub bike in 2015. It was stolen and then got it back missing AllCell 48v17ah pack. Replaced with the Grin 52v16ah downtube battery. Rather that remount bulky Ezee controller am using Baserunner inside the battery case. Loss of torque due to lower phase current not really noticeable for around-town use.

Bought a Satiator charger to preserve battery life. Using 52v 85% charge profile it reports charge complete at 56.5v. The CA-3 displays 54.5v. The baserunner dashboard tab says 63.6v. Seems like the charger is most likely to be accurate. Has anyone else observed this level of difference between readings?

Get a good DMM ideally calibrated, borrow a Fluke if necessary.

Then calibrate your various devices so they are in agreement.

If something can't be calibrated, ignore it or replace it.

Realize that different locations will vary with voltage drop,

At the battery post is what counts for SoC.

Even a cheap DMM can be OK with a reference e.g. https://www.ebay.com/itm/LM399-4-Channel-2-5v-7-5v-5v-10v-High-Precision-Voltage-Reference-Module/263435494861

what does your multimeter display?

The multimeter says +/- 0.1v what the CA-3 says. Strange that expensive charger would report different voltage. Next charge I'll set to 100% and see what happens. The Baserunner controller software reporting so high probably doesn't matter since it seems to run fine.

I have a 17ah 14 series battery pack. When it charges to 100 percent, the voltage is 58.8 volts just before the charging is done. But when disconnecting the charger, the battery voltage is lower, because the charger doesnt charge the battery after the current is lower than a set limit. Are your measurements just before the charging finishes, or after the charger has "gone green"?
That Baserunner thingy has to be very poorly calibrated, though

There is a chance the problem is in the battery to controller connector, or battery wiring. any corrosion, worn or lose connector, or any resistance between the battery and the controller could cause a voltage drop between what the Satiator sees at the BMS, and what the CA reads in the controller. You might want to measure the voltage at the connector on the Satiator with your DMM to see it it realy is off, or matches what the display says. If it matches, you've got a wiring problem that hasn't become a big problem yet.
The Baserunner has no such excuse. I'd expect it to read what the CA does.

You might want to email Grin. I know the CA has adjustments for the voltage display, but no idea on the baserunner or Satiator. They may well just need a settings tweak to read right.

treewell said:

Strange that expensive charger would report different voltage

Click to expand...

Even the most expensive charge sources require regular calibration.

Some you just can't and need to adjust output setpoints based on DMM readings.

Could also have to do with the Satiator's "resistance" setting; it needs to know the resistance of the battery/cable/etc., IIRC, to give accurate readouts. Can't remember how to get to that.

For accurate **voltage**?

The V drop between the internal pack bulk terminals and at the charger should be **extremely** small right?

Sent email to Grin. Thought about charger cable resistance but that seems unlikely since Satiator, 52v16ah, Baserunner and all cabling purchased on same order. The Satiator came with two 52v profiles active.