Model 100% Efficient Battery and Calculate TDV
I'm trying to determine TDV savings from charging a battery at night and discharging between 5pm and 8pm. However, I am getting a worse TDV value when the model has the battery vs when I don't have the battery. The opposite of what I expected.
I suspect the inefficiencies of my battery explain this, but I wanted to check by modeling a 100% efficient battery to make sure I didn't do something wrong. I think I made the battery 100% efficient, but I'm still getting a worse TDV value with the battery. Can anyone spot something I did wrong? Or maybe another object I should check in the IDF file that I overlooked?
BEGIN UPDATE
Okay, so then I thought that I could test if my battery simulation really is 100% efficient by making an enormous battery with a huge initial charge that could supply the entire building for a year, set the charge schedule to 0 all the time, and set the discharge schedule to 1 all the time. That gave me these TDV values:
Total Energy [GJ]
Total Site Energy 553.57
Net Site Energy -5753.6
Total Source Energy 9.13
Net Source Energy -46417.4
This makes me think that I'm not interpreting these values correctly. I took my interpretation from this post, but that doesn't make sense with the large negative Net Source Energy value. I would think the Total Source Energy, which I think represents TDV, would be the large negative value.
So what's going on here. Should I add the numbers or something?
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ElectricLoadCenter:Inverter:LookUpTable,
Storage Inverter, !- Name
, !- Availability Schedule Name
, !- Zone Name
0.00, !- Radiative Fraction
14000, !- Rated Maximum Continuous Output Power {W}
0.0, !- Night Tare Loss Power {W}
368, !- Nominal Voltage Input {V}
1, !- Efficiency at 10% Power and Nominal Voltage
1, !- Efficiency at 20% Power and Nominal Voltage
1, !- Efficiency at 30% Power and Nominal Voltage
1, !- Efficiency at 50% Power and Nominal Voltage
1, !- Efficiency at 75% Power and Nominal Voltage
1; !- Efficiency at 100% Power and Nominal Voltage
ElectricLoadCenter:Storage:Simple,
Battery, !- Name
, !- Availability Schedule Name
, !- Zone Name
0.0, !- Radiative Fraction for Zone Heat Gains
1.0, !- Nominal Energetic Efficiency for Charging
1.0, !- Nominal Discharging Energetic Efficiency
1.0E12, !- Maximum Storage Capacity {J}
200000, !- Maximum Power for Discharging {W}
200000, !- Maximum Power for Charging {W}
1.0E12; !- Initial State of Charge {J}
ElectricLoadCenter:Distribution,
Grid Battery Load Center,!- Name
, !- Generator List Name
, !- Generator Operation Scheme Type
0, !- Generator Demand Limit Scheme Purchased Electric Demand Limit {W}
, !- Generator Track Schedule Name Scheme Schedule Name
, !- Generator Track Meter Scheme Meter Name
DirectCurrentWithInverterDCStorage, !- Electrical Buss Type
Storage Inverter, !- Inverter Name
Battery, !- Electrical Storage Object Name
, !- Transformer Object Name
TrackChargeDischargeSchedules, !- Storage Operation Scheme
, !- Storage Control Track Meter Name
Grid Charge Converter, !- Storage Converter Object Name
0.96, !- Maximum Storage State of Charge Fraction
0.4, !- Minimum Storage State of Charge Fraction
500000, !- Design Storage Control Charge Power {W}
Charge ...