Buck Your Solar with a Mex Gizmo?

These Golf Cart gizmos may be the way to go, though.

This could possibly work, but does not mention max amp input (others are max 5a in, 30a out)

http://www.ebay.com/itm/Golf-Cart-DC-Converter-36V-to-12V-Step-Down-Reducer-0A-30A-30amp-EZOGO

YOu guys are just trying to get me in trouble, aren't you.

That link worked for me. 30a output at 24v is 60a at 12v?

Bend is about ready to organize a 60a version of the Eco-Worthy 20 amper MPPT for under $200 instead of a $600 Morningstar :)

Bend's link for BFL won't work... input is 45-75v.

And at $140 u.s. (with shipping) it's more than an eco-w mppt.

The link for Mex, however...

Thank you for the link. The squealing suddenly went silent.

BFL13-

I’ve come up with this for thought:

1 of these to handle the primary voltage reduction-

http://www.ebay.com/itm/Golf-Cart-DC-Converter-60V-to-24V-Step-Down-Reducer-0A-30A-30amp-EZOGO-/221482849696?pt=LH_DefaultDomain_2&hash=item33916815a0&vxp=mtr

Then follow with 2-3 of the cheap 7-32v buckers paralleled to meet amperage and fine tune the wanted voltage.

Mex:

Here is 1 that nearly meets your needs, might want 2 (72v to 12v is available also):

http://www.ebay.com/itm/Golf-Cart-DC-Converter-72V-to-24V-Step-Down-Reducer-0A-30A-30amp-EZOGO-/181457017046?hash=item2a3fae58d6&vxp=mtr

If I could get away with 200 volts 400 volts, 600 volts I would use that preferably. But that's dreaming. 80 at max will have to do and hopefully two or three Buckers connected in parallel to render 45 amperes max charge rate.

Now to go grab a hatchet and find the piggy bank. It's hiding.

Lin tells me China industry gossip has the country projecting the manufacture of eight million plus panels for the month of November 2014. Almost double that over 2013. Ships carrying raw material from Australia are lined up at ports, and railroad trains carry the material to manufacturing centers. African countries have been purchasing millions of panels. China is determined to sell more than ONE BILLION panels in 10-years. It is mind-boggling. He said automobile lithium batteries are in Beta testing phase. That country has big plans. I hope they don't turn it into a hazardous waste dump with toxic air. He said coal fired electrical plants have turned many regions into areas with perpetual brown sky and 1/2 km visibility. China to Mexico telephone call. I wonder how many NSA computers went whirring on that one? Thanks to a donated GALAXY 2 cellular and headphones I was able to understand Lin's heavily accented English very well. I look forward to lithium technology replacing lead acid.

I think means
Series the panels.. six times the voltage, but only 1/6 the amps compared to parallel.. amps times resistance equal voltage drop, 43 meters, lots of voltage drop with high amp dc

Same reason people buy high voltage panels and then go MPPT controller

MEXICOWANDERER wrote:
BFL.

The nearest sunlight open patch other than obliterating my precious garden is 43 meters distant. I could cut down some parota trees and strangler figs but I prefer not to. I live in a savannah jungle. I would series panels to arrive at as near to 80 volts as I could then run wire to the house and rig. The bucker would take the power and translate it into usable 12 volt form. One sixth the amperage. Forty three meters is no joke when attempting to maintain <2% voltage drop. The taller de torno in Lazaro is going to TIG the panels together. If a thief can run off with with a 3 X 5 meter patch of panels under one arm he can have them. I have to stretch chicken wire over the panels (2 meters distance) to thwart local delinquents from lobbing rocks and breaking the panes.

Mex, please clarify "One sixth the amperage" 1/6 of what? or ? what meaning?

IMO the chicken wire will be ok at that distance for shading. A dog exercise pen type fence "shading" part of the 230w panel in the evening low sun doesn't have a noticeable effect and its "wires" are fat compared with chicken wire fencing.

Also. I was thinking in terms of having to raise or lower the gizmos output every time it's input changed significantly. Of course, now that I think about it, you could only lower it so far before there would be insufficient voltage to charge anyway.