EG4 18kPV Round trip Efficiency and overall system efficiency data and calcs
- Thread starter SignatureSolarJames
- Start date
Quattrohead
Solar Wizard
I would be surprised if the efficiency was that low because the inverter runs so cool, so it is not wasting power by converting it to excess heat.
Unlike the Voltronic and Growatt inverters !!!!
Unlike the Voltronic and Growatt inverters !!!!
Plum Crazy Rob
Solar Enthusiast
For reference, I think this is the thread referenced earlier. I don't think anyone ever proved him wrong at 81.3%. So 90% would obviously be "shocking" lol.
diysolarforum.com
My System Efficiency is 81.3%. Prove me wrong or show me your math.
I just did a post about how my solar system performed over the last 159 days and I calculated my system efficiency which came out to a fairly abysmal 81.3%. So how did I calculate the efficiency? I measured my actual load using Emporia Vue inside my main panel. I have compared its readings to...
diysolarforum.com
Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 21,532
PV to Battery 97.5% x Batt to AC 95.5% = 93.1% round trip
100% - 93.1% = 6.9% loss, matching PV -> Batt -> AC 7% loss.
Note this does not include battery itself. The cells will have a round-trip efficiency, probably dependent on current, and FET type BMS will have resistance so loss proportional to square of current just like the inverter.
Reaching low 80% takes quite a bit, but poor PF of rectifier-capacitor power supply front ends could easily do that.
As I noted in that thread, LED lighting was a big part of his loads. Poor power factor, higher current for a given wattage, causing higher losses in inverter (and battery).
Need to test with pure resistive load.
100% - 93.1% = 6.9% loss, matching PV -> Batt -> AC 7% loss.
Note this does not include battery itself. The cells will have a round-trip efficiency, probably dependent on current, and FET type BMS will have resistance so loss proportional to square of current just like the inverter.
Reaching low 80% takes quite a bit, but poor PF of rectifier-capacitor power supply front ends could easily do that.
For reference, I think this is the thread referenced earlier. I don't think anyone ever proved him wrong at 81.3%. So 90% would obviously be "shocking" lol.
My System Efficiency is 81.3%. Prove me wrong or show me your math.
I just did a post about how my solar system performed over the last 159 days and I calculated my system efficiency which came out to a fairly abysmal 81.3%. So how did I calculate the efficiency? I measured my actual load using Emporia Vue inside my main panel. I have compared its readings to...
As I noted in that thread, LED lighting was a big part of his loads. Poor power factor, higher current for a given wattage, causing higher losses in inverter (and battery).
Need to test with pure resistive load.
Plum Crazy Rob
Solar Enthusiast
nuke
New Member
Well, just continuing to monitor, my lifetime charge/discharge efficiency is right around 85% at this point. Not bad. Not amazing. Kind of what you'd expect, I suppose.
The few days where it dipped lower than that - I can't really explain still. Maybe ac charging is less efficient? Maybe the rate of discharge? power factor?
Nonetheless, on net, we're at about 85%.
The few days where it dipped lower than that - I can't really explain still. Maybe ac charging is less efficient? Maybe the rate of discharge? power factor?
Nonetheless, on net, we're at about 85%.