The problem right now is on the electric meter. By default, eQuest will put the COGEN-TRACK-MODE on "Track Electric Load".
In your case, and provided you can feed electricity to the grid (net metering, feed-in tariff) or to approach the effect of battery storage (to my knowledge you cannot explicitly model battery storage), you want COGEN-TRACK-MODE = MAX-OUTPUT (Run at maximum), which will allow your generator to produce more power than your building demand.
You probably will want to get that straight for your specific needs, and also assign the proper utility rate configuration, including BUY/SELL-MODE.
Doing this will increase your ratio of inverter output(AC kWh) to inverter input (DC kWh) from 76% to 88% on generator 1 for example.
You're not seeing 93% and that's perfectly normal. There are two explanations:
- Inverter clipping: which is when your inverter is saturated. This won't be the case for you because your Actual DC to AC ratio is basically 1. The industry tends to use 1.2, meaning there could be times where this happens.
- Array producing a too low voltage which will derate the inverter's efficiency, or so low it will even shut-down.
In eQuest you want to look at the operating limits and conditions:
MIN-OPER-VOLT
specifies the minimim
input voltage below which the inverter
will shut down.
MIN-TRACK-VOLT
specifies the minimum
input tracking voltage at which the
inverter can operate efficiently.
Below this value, the inverter can
still operate, however its efficiency
will drop linearly as a function of
the actual input voltage
MAX-TRACK-VOLTS
specifies the maximum
input tracking voltage at which the
inverter can operate efficiently. Any
input voltage above this value will be
limited to this value in the power
conversion calculations.
@Ashok Dhayal please update your question to show what are the characteristics of the inverters... I've never modeled PV in eQuest but an obvious reason for your problem would be that the inverters are too small compared to your array, which limits the output. This is often called the Actual DC to AC Ratio = Total nameplate Array capacity in DC kWp / Total Nameplate Inverter Capacity in DC kW. A fairly typical value would be around 1.2 or so.
Inverter specifications:
Capacity per inverter : 50 kVA Efficiency: 93% Inverter control : Run when needed Minimum ratio: 0.02 Maximum ratio: 1.0752
Can you share the full .inp section in question? It'll help finding what's wrong. Could be that your inverters Min/Max tracking volts are wrong for your arrays
I am using default EIR=f(PLR) curve. Please write me how to update this curve if required. Since karma is less than 10, I could not upload .INP section. Would you please write me your email address ?
There you go, karma at 11. But you can just include the code (the text) itself in your question. If too long, put a link to a pastebin for example.