Can MPII handle 2x48/10 batteries?

[Morgen 3Eman]

Hi Zero,

The load is largely what determines power drawn from a given voltage.  Households are commonly capable of supplying 200+ amps, but the 100 watt light will only draw about an amp. If you want to draw more amps, you screw in a 200, or 500 watt bulb.    In the case of your MPII, at 48 volts, it is your MP2 that is limiting the power drawn, be it from 1 48V battery or 100 48V batteries.  (Yes, Alan, there will be sag effect variation) . 

Perhaps you should be looking at the programmed limits in your MP2.  I have absolutely no knowledge about the MP2, but Alan recently said he was drawing close to 100 amps with a modified Pie. 

We really need a "Big Grin" button for talking about 100Amp Pies.....   Maybe this is it...

I hope this helps.

TTFN,
Dennis

[Zero]

Can anybody say what is the maximum amperage, that passes the unmodified mp2 internal controller shunt @ 50V, that is actually what i've been trying to find out with my few last posts.

[Phil O Dendron]

Zero,

sorry, I assumed you already got the programming interface cable 

Can only talk about my Magic Pie 2 with internal controller, pcb revision mx328.

I could not get more than 15 ampere without modification with a Zhenlong 36V 10ah li-ion battery.
Changed the battery to a diy 12s5p pack made of samsung icr 18650 cells, no bms.

Still not more than 16 ampere. 
I used the cruise controller software revision 200 at that time.

Then I improved the soldering on the pcb, "beefed up" the high current tracks with copper wire,
replaced the two capacitors rated 470uf / 63v with 6x 330uf / 80v /125°c.

Result: 25 ampere peak 
The shunt was not touced at this time.

Next stage: bridged about one third of the shunt with copper wire and changed software to rev. 280 (or 282, not sure).
Result: when settig peak current to 70 amps the wattmeter showed 50 amps peak.

Turned it down via software to 55 amps peak, resulting in 40 amps shown on wattmeter.

So I assume you could get more than 15 or 16 amps just with using the newest software and the programming cable.

Hope that helps.

Cheers, phil.

[Zero]

That was informative, thanks! I'll post my progress here, so stay tuned