How to find the efficiency of your battery charger.
ฝัง
- เผยแพร่เมื่อ 18 ต.ค. 2023
- In this video I wanted to show how to easily find the efficiency of your battery charger.
-=Items in this video:=-
Haisito 20 Amp Lithium Battery Charger, 12V and 24V Lifepo4,Lead-Acid(AGM/Gel/SLA..) Battery Charger ,Battery Maintainer, Trickle Charger, and Battery Desulfator for Car ,Boat,Motorcycle, Lawn Mower
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Ardroit 14.6V 30A LifePO4 Battery Charger Trickle Charger Smart Charger and Maintainer for 12V LiFePO4 Lithium-Iron Deep Cycle Rechargeable Batteries & Battery Desulfator
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Redodo 12V 100Ah Mini LiFePO4 Lithium Battery with Small Size and Light Weight, Built-in 100A BMS and Grade A Cells, 4000-15000 Cycles & 10 Years Lifetime, Perfect for Boat, Solar Home, RV, Off-Grid
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P3 International P4460 Kill A Watt EZ Electricity Usage Monitor , grey
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IDEAL Industries INC. 61-757 TightSight 600 Amp 600-Volt Digital Truerms AC/DC Clamp Meter
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That was quite informative. Thank you for showing how to calculate efficiency.
You're welcome and thanks for the comment!
Than you, sir.
You're welcome. Thanks for the comment.
👍
Question: Would the battery's state of charge affect the efficiency calculation ? What was your Redodo battery's state of charge ? Thanks
The Redodo was right around 25% SOC. I don't think it would affect efficiency because as the charger voltage gets higher, the amperage it puts out drops. The output wattage remains the same. I would need to test that to verify. Thanks for the question and comment.
The state of charge will not, but the charge or discharge rate will. Battery efficiency is roughly 95% at a 0.2C charge or discharge rate. The efficiency will go down as the C rate goes up due to the internal resistance of the cells.
Power losses from internal resistances go by the square of the current. P = I^2 * R. The same holds for wiring losses as well. Its pretty much universal.
May I ask if you noted the volt amps as well as the watts, please? your P3 has that function. Some of the battery chargers show say 100 watts but are using 175 volt amps. Any generator powering the charger is burning fuel at the 175 rate rather than a 100 rate. The P3 also has a power factor reading that would indicate the charger's power conversion efficiency. You measured the DC side as volt amps. In DC the watts and volt amps are the same.
The reason I'm asking, is I have a 900/600 watt (really volt amps) propane only powered inverter generator. The efficiency sweet spot is about 500 "watts", near your P3 watt reading. after seeing your test I'm tempted to buy that same 30 amp battery charger but cannot run over 600 volt amps continuously with out generator burn out.
Additionally some off grid viewers might like to know if their generator was using fuel in the 480 watt range or as if the charger was using closer to 800 watts rate if that was the actual volt amp range and fuel usage rate.
A T Burke
Sorry for the late reply! While charging at 10A the watts are 170w and the V/A is 245. The power factor shows .69. Hope that answers your question.
Thanks!
Thank you, Sir. I have one of those 5 year old Ryobi propane only 900w peak 600w running rated generators. But, the rating is actually in volt-amps like in all rotating armature AC generators/alternators. When using low PF loads I have to remember to only use about 70%+or- of the 600 so called watts or the unit barfs.
A T Burke@@OffGridBasement
Generally speaking, not great when charging via an AC outlet. The inefficiencies add up quickly. So... 80% to 85% is typical for AC chargers. And if you are doing it from an inverter its even worse. The inverter will be say 85% efficient, and the charger will be 80%... that is (0.85 * 0.80) = 68% efficiency.
Isolated Buck-boost DC-to-DC converters generally top out at 90%. Non-isolated buck-boost converters can hit 94% or so.
However, you can get up to 97% efficiency when charging a lower-voltage battery bank from a higher-voltage battery bank. For example, by using a simple Victron charge controller (which are buck-only synchronous charge controllers).
I use that trick all the time to charge 12V banks from 24V or 48V banks. 97% effiicency is really nice. A lot of people don't realize that you can use Victron charge controllers that way. The input does not have to come from solar.
In addition to all of that, the battery itself is only 95% efficient (the charge curve voltage vs discharge curve voltage at the same SOC averages out to a 5% loss). And that is only if you charge and discharge at 0.2C or lower. If you charge or discharge at higher C-rates, the efficiency will be somewhat worse.
Great info! I have a spare victron controller that I plan on doing just that. Thanks for the comment.