Voltage drop musings [RE-wrenches]

[Carl Emerson]

Hullo again all...

Can someone explain why Rick Cullen cannot contribute direct to the list as his
input is quite valuable??

> With an SB added between the PV and battery/inverter, and the SB charge
> voltage setpoint set higher than the inverter's, the SB will work it's heart
> out MPPT'ing trying to get the batteries to the SB's charge voltage
> setpoint. But, the inverter won't let the battery voltage get that high so
> the SB stays in "bulk" charge mode. The SB then continuously Max Power Point
> Tracks the PV array to pull as much power as the array can deliver,
> typically delivering more charge current and therefore more power to the
> grid via the inverter.
>

This is exactly what I have done with the AERL MPPT units in grid tie
installations.
For us the crucial design issue is mid winter performance as we have no "snow"
advantage here but only 3.5 hours sun in June.
I am not concerned that MPPT has little advantage in summer.
I am often faced with the challenge of Maximum performance from Minimum array
size and this makes MPPT a Godsend.
Over here the client is less likely to complain about the price of MPPT, it is
the inflated prices of the panels that is the killer.

Regarding the proposed tests with a C40 and the 3048 can we please have the
proposed test clearly defined and the results posted here.

Carl Emerson
Manager
FREEPOWER LTD.  "Harnessing Natural Energy"  Auckland, NEW ZEALAND.


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