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Author Topic: Sunny Island Set Up ?  (Read 8492 times)
rogeriko
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« Reply #15 on: March 03, 2011, 07:44:53 PM »

Sorry you are right so lets reconfigure the panels..... 24.4 volts is not enough to charge 24 volt batteries, they need at least 29/30 volts so you have to wire all the panels in pairs to give you 48.8 volts and then connect all the pairs together and bring two thick wires down to the batteries and then use a MPPT controller to bring the voltage down to the required 24 to 28 volts for charging. It would be possible to still wire the panels in 2 groups of 4 in series and bring 2 wires down to a MPPT controller. Unfortunately you will waste to much power if you use a regular controller you must use an MPPT.

(If the panels were 30 volt Umpp you could use a regular controller)

Your 8x180 watt panels 1440w could feasibly produce 60 amps at 24 volts so you need a 60 amp MPPT controller!!
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russ_fae_fyvie
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« Reply #16 on: March 04, 2011, 07:43:19 AM »

Thanks for that, I have just emailed the installer to find out how he wired it up from the roof because they were installed as the house was build so no t sure how easy it is to access the original wiring.
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All finished so the new adventure now starts here !
stephendv
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« Reply #17 on: March 04, 2011, 07:51:59 AM »

They must all be wired in series at the moment to fit into the MPP range of the sunny boy 1700.  If the installer really REALLY can't get at the cables (or if he's going to charge you an arm and a leg to do it) then your only other option is to use the brand new Midnite Classic 250 charge controller that will accept the high voltage of a single string of 192V.  You'll have to buy it directly the US, don't think any EU distributors have it in stock yet.
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http://www.casanogaldelasbrujas.com
2.8kW PV, SMA Sunny Island 5048, 5 PzS 700 battery bank, stinky diesel.
billi
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« Reply #18 on: March 04, 2011, 09:36:00 AM »

...... Roll Eyes So you are getting 3 powersources  Diesel, PV, Wind , like i said earlier  , i would have a look in the manuals  before buying all the gear and think about it how they all work together .... and talk about it with your installer

charging volt setpoints , dump element , temp compensated charge , dump element size , absorption time set-points, equalizing charge .... etc

Cause it will be the windturbine controller that dominates all that   Roll Eyes (normally )

And thats why i vote for the Outback MPPT controller with its programmable relay


Billi
« Last Edit: March 04, 2011, 09:37:40 AM by billi » Logged

1.6 kw and 2.4 kw   PV array  , Outback MX 60 and FM80 charge controller  ,24 volt 1600 AH Battery ,6 Kw Victron inverter charger, 1.1 kw high head hydro turbine as a back up generator , 5 kw woodburner, 36 solar tubes with 360 l water tank, 1.6 kw  windturbine
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