I have searched many forums for answers to my questions and I think this forum will be it
I am designing an portable off-grid hybrid generator (Solar & Wind).
It is supposed to be stationed in the desert (high temps, very wide temp range between day and night, lots of dust).
The configuration is as follows:
- 18 Panels of UniSolar PVL-144 (weight nothing, no glass - highly durable and work well in high temps and lower light conditions(covered in dust)).
- 1 Tangarie 2.25Kw VAWT.
- around 1000AH @ 24V battery bank AGM deep cycle (concorde/trojan).
This is the basic system, and this is where my questions are just rising all the time.
Q. which configuration give more yield?
Should I go with AC coupling configuration? Means I will connect the solar panels to SMA sunnyboy and the wind turbine to Windy Boy and have Sunny Island as mini-grid?
Or should I connect the panels on dc side with sunny island chargers (MPPT) and the turbine on the AC side and have the Sunny ISland manage the grid and charging?
The consumer draws 700W per hour 24 hours a day... I think that the second configuration yields more power at lower light conditions where the SunnyBoy would pass the limit to start generating energy - Is this correct?
Q. Connecting the turbine on dc side to yield power at low wind conditions:
Is there any charge controller that I can connect 0-600DC from the turbine so I can connect it to the dc side(meaning it will sync with sunny island)? Will this mess with the Sunny Island chargers if they won't be synced? Having 2 different chargers not sync on the same battery bank.
Q. How do I determine the threshold where the inverter/charge controller starts producing energy?
Meaning I see a charge controller have "optimal MPPT range 25V-60V", "max input voltage 140VDC", "Max input current 40A", "Max Pv power 1250W" - What is the parameters for starting the harvest the energy from the panels?
Q. Which AGM batteries would be best from your experience?
As you may noticed I chose AGM because they don't spill anything while this system is on the move and they have good characteristic for off-grid applications.
Which company is better out of Trojan and Concorde? Better performance, pricing and guarantee.
Comments and improvements are welcomed!