Eg4 48v 18ah battery charger is tripping 6500 Predator generator.

[Atomicly]

How did you determine that it pulls 16 amps@120VAC?

Here is my napkin math.
18 amps @ 55.2VDC = 993.6 dc watts
993.6 dc watts / .75 conversion efficiency = 1324.8 ac watts
1324.8 ac watts / 120VAC = 11.04 amps

I said the max amp usage from what I see on the sticker is 16 amps.

 

[John Frum]

I said the max amp usage from what I see on the sticker is 16 amps.

That is at 90 volts ac.

 

[John Frum]

It's just the charger that is running on the 20A outlet.

I think @PreppenWolf wants to validate the extension cord.
I think that is a good idea.

 

[John Frum]

The next thing to validate is the breaker.

 

[Bud Martin]

I like to know how they come up with >95% effi.
Input @90Vac (worst case) x 16A = 1440W
Output 58.4V x 18A = 1051W
OP needs to get Kill-A-Watt and take the measurement.

 

[Atomicly]

I like to know how they come up with >95% effi.
Input @90Vac (worst case) x 16A = 1440W
Output 58.4V x 18A = 1051W
OP needs to get Kill-A-Watt and take the measurement.

View attachment 125893

I'll try and get a watt-meter first thing tomorrow if I can.

 

[Atomicly]

I think @PreppenWolf wants to validate the extension cord.
I think that is a good idea.

I'm going to see if I can move my generator next to my shed temporarily. I want to plug in the charger directly to it, just to test it.

 

[John Frum]

I like to know how they come up with >95% effi.

I expect that number is pure fantasy.

 

[John Frum]

1440 watts is 80% of a 15 amp circuit.
Exactly what we would expect for a continuous load such as a charger.
That makes the efficiency ~73%.

 

[Bud Martin]

I will not be surprised, I wonder if EG4 has validation engineer, or they just believe the Chinese supplier without questioning.
Didn't they have issue with these chargers before that did deliver the output per spec?
I see their ad in Youtube, but now I'm not so sure they know what they are selling.
It looks like Ben will be busy cleaning up the mess again.

 

[John Frum]

Didn't they have issue with these chargers before that did deliver the output per spec?

I don't recall.

 

[Atomicly]

I will not be surprised, I wonder if EG4 has validation engineer, or they just believe the Chinese supplier without questioning.
Didn't they have issue with these chargers before that did deliver the output per spec?
I see their ad in Youtube, but now I'm not so sure they know what they are selling.

I think their 48V 25A chargers didn't output enough current as advertised.

 

[Bud Martin]

I think their 48V 25A chargers didn't output enough current as advertised.

Yes, there are threads about it.

25A 48V charger only putting out low 14A 700-800 watts

I bought the 48V 25A 120V Battery Charger by EG4 https://www.signaturesolar.us/products/48v-25a-120v-battery-charger-by-eg4 from Signature Solar However, I am on day 2. And either it only produces 14 amps or the battery, the 48V 100AH-LL Battery by EG4, is only absorbing 14 amps. This means...

diysolarforum.com

Eg4 48 volt battery charger

please Explain the SOC light while charging. I’ve been charging for two days with the EG4 charger. I watch the packs and at some times all the packs will have the 50% or 75%light flashing while others don’t. At times all of them will have lights flashing and at time none of them will have lights...

diysolarforum.com

EG4 48v 25a Battery Charger Update

Signature Solar was made aware of an issue on November 4th regarding the battery charger we sold. A link to the thread is here and here. The issue: The 48v 25a EG4 Battery charger was consistently measured as only outputting 17-18a by multiple customers and by staff on premises at Signature...

diysolarforum.com

 

[Bud Martin]

1440 watts is 80% of a 15 amp circuit.
Exactly what we would expect for a continuous load such as a charger.
That makes the efficiency ~73%.

They seem to have false adv. per their published spec.
Did they not learn from previous charger they sold?

 

[John Frum]

@Atomicly what news?

 

[Bud Martin]

@Atomicly what news?

The one I really want to hear from is Ben because I sure like to know if he has his engineer perform the test to validate it to make sure it meets the published spec. or not.

 

[solar8484]

Note the specs don't say "continuous". The specs are likely the best possible performance for a millisecond under perfect conditions. That's how typical low end Chinese manufacturers (and their resellers like EG4) spec their inverters and chargers.

 

[PreppenWolf]

I did a test just now with one unit. It's 9.0A @ 117VAC continuous input with my batteries at 51.7V right now. So 1,053W. This is fine for me and basically what I expected.

I'll try to check again when they are closer to 48V.

 

[PreppenWolf]

Adding I found out about this sweet gem from another thread. I'm going to buy one of these at some point for sure.

V5 AutoGen 48v DC Generator | Smartest 48v DC Generator

V5 AutoGen Automatic Start 48v DC Generator. Designed to automatically startup and charge low battery banks. Accessible over wifi through our ...

dcautogen.com

 

[Bud Martin]

I did a test just now with one unit. It's 9.0A @ 117VAC continuous input with my batteries at 51.7V right now. So 1,053W. This is fine for me and basically what I expected.

I'll try to check again when they are closer to 48V.

Do you have the same charger as OP?
What is the charging current when you see 9A on the AC side?