mixing panels

[(unknown)]

i have five panels in tolal

two are the same 180watts : voc: 30.0v

isc:8.37

vmp:23.7

i would like to wire that together with the other 3 panels :

1) panel from solarex 65watts : voc:21.4

i sc:4.05

vmp:17.1

2)panel 70watts voc:21.5

isc: 4.35

vmp:16.9

3) solar module rsm70 : i think is 75watts 12volts panel

what is the best way possible. and what kind of inverter and regulator should i use . thank you  

[ghurd]

You did not tell us the intentions.

The best way possible is not often logical from the monetary perspective.

The first 2 PVs are unusual, probably made for grid tied inverters or some strange 24V system.

The rest are 12V.

Connecting all 5 in parallel on a 12V system is the best bet to use all 5.

Need to be careful which controller is used.  Most will not appreciate that 30Voc.

Might be able to pull off a questionable 24V system using only 4 PVs.

Might be able to sell the unusual PVs to someone with a 24V system, and use it to buy some similar 12V PVs that cause less headaches.

The possibilities for "the best way possible" are many, depending on the thickness of the wallet involved.

G-

[obala]

thank you mr ghurd for your reply . i live in morocco with no electricity . and i gathered what i could so far as solar here is not as available in quality . my intentions are to be able to run lights , tv with satellite receiver , use lap top , blender , hopefully small fridge, fan .  will the 24v system work for me if i get 24v controller and what kind of inverter should i use.

[ghurd]

I believe you will be better with a 12V system.

Conservation of electricity is possibly more important than making it.

http://www.fieldlines.com/story/2007/3/10/23942/1876

http://www.fieldlines.com/story/2008/7/8/172317/7334

A blender is easy because it operates for a very short time.

Fridge can be difficult.

G-

[dnix71]

Engel and Sundanzer make 12v fridges that are portable but use very little power.

None are cheap. I have used the Engel for two years now, with no trouble. It is a real fridge, with compresssor and freon. It keeps milk, eggs and cheese very well.

http://products.bigfrogmountain.com/shop/catalog/Engel-orderby0-p-1-mf-25.html

The MR040 is the best buy. It has a plastic shell (no rust or dents), reversible lid, runs on 12 or 24vdc or 110ac and uses 36 watts when running. Mine has a dial temp control, the new ones have a digital control.

It will freeze or cool, you choose. The warmest setting is +5C, the coldest about -20C

You've got plenty of solar to run it. You just need deep cycle batteries.

http://www.wmjmarine.com/dcr165c.html  The Sundanzer runs on 12 or 24v dc and uses

6.5Ah @ 70F, 14AH @ 90F, 29Ah @ 110F per day according to their specs.

[scottsAI]

Obala,

Coleman Stirling engine cooler (fridge) Can be Freezer or refrigerator.

Couple examples of changing the thermostat on a chest freezer and use as  refrigerator, requiring very little power. Other examples are using Fridge with added insulation, being careful not to cover anything important. YMMV.

Have fun,

Scott.

[Bruce S]

obala;

  Seems interesting mix of panels you have there. Do you intend to have these charging batteries? then use during ALL day/night?

There may be a way to use ALL of them but a bit pricy even here in US.

A 24V MPPT controller such as Morning Star MPPT can take in up to 75Vdc from connected panels.

So you could connect the (2)30V panels in parallel connect the other 3 in series these (3) together would be up around 50Vdc, connect this (3) panel bank in parallel with the two 30Vdc panels, then single set of wires going to MPPT controller for 24V setup.

Setup battery bank for 24V and have a 24V inverter for items listed.

Actually would be better to have a few different controllers and inverters, the fridge, unless its a small solid state unit, will likely need one by itself.

I realize the voltages will not be exact and when paralleling 30Vdc with ~50Vdc will draw the bank down to an average somewhere in between, BUT this will allow you to use all 5 panels and with the wattage ratings they seem to have; it would be a waste to leave any of the panels alone.

You could of course use the 30Vdc 180 watt panels together with a 24V system for running the fridge then use a dirrerent controller for 12Vdc to run All other devices.

Really depends on what you can source there and amount of money you're willing to devote to the system.

Best of Luck;

Bruce S