How many constant amps does my 36 or 40 amp charger draw

[Bandersnatch]

for example two different boats (friend and mine) with two different chargers

 

I have a dual pro 2009 ranger 40amp four bank (10 amp per bank i suppose) 

 

He has a pro mariner pro tournament 36 amp four bank 

 

I'm removing my 3 lead acids and going with one 36v lithium and I'm going to likely keep my old dual pro for now and purchase a cheap 36v charger.

 

What I don't understand is how many AMPS from the outlet (110v) that the chargers actually pull. In a specific situation (canada trip) I have to pull off of one single 15 or 20 (can't remember) amp outlet. 

 

Obviously a 15 amp outlet can't pull more than 15 constant amps otherwise the breaker would trip

 

Question 

If I'm using the dual pro 4 bank with only one lead I assume it's only going to pull enough for 10 amps for that battery but what actually amps from the outlet will it be pulling?

 

The same goes for my other charger which we will say will be a 20amp 36v charger. How many constant amps from the outlet will it pull ? 

 

Is the charger the one upping the amps? Point is, I don't want this 15-20amp breaker constantly tripping. 

[A-Jay]

Unless you know for sure that your 16 year old charger designed for lead acid batteries, will even charge your new lithium battery, you may need a new charger. I'd contact both the battery and charger companies for the real skinny.

A-Jay

[MN Fisher]

9 minutes ago, Bandersnatch said:

and purchase a cheap 36v charger.

If you're going Lithium do NOT go cheap on the charger...get the best you can spring for. NOCO comes to mind for me - it's the only brand I'll put on the boat.

 

 

[Bandersnatch]

26 minutes ago, A-Jay said:

Unless you know for sure that your 16 year old charger designed for lead acid batteries, will even charge your new lithium battery, you may need a new charger. I'd contact both the battery and charger companies for the real skinny.

A-Jay

I’m not intending on running my 15 year old charger on the lithium. 
 

 

I was intending for low to leave the dual pro (15 year old charger) with one lead conntexted to my giant x2 cranking battery and then use a dedicated 36v 10 or 20 amp lithium charger for my single lithium battery. What I don’t want is my standard 15-20amp breaker tripping because I’ve plugged in two chargers. It sounds like people, like me, aren’t sure how much their chargers actually pull from the outlet. 

25 minutes ago, MN Fisher said:

If you're going Lithium do NOT go cheap on the charger...get the best you can spring for. NOCO comes to mind for me - it's the only brand I'll put on the boat.

 

 

Okay, take cheap out of it, how many amps does your noco charger pull from the outlet and how many amps is that charger overall and per bank?  Buying a charger that will do a 12v arm and a 36v lithium is not what I’m willing to spend right now 

[MN Fisher]

3 minutes ago, Bandersnatch said:

Okay, take cheap out of it, how many amps does your noco charger pull from the outlet and how many amps is that charger overall and per bank?

I'm running a 12v 5x2 - 10 amps total into two banks of 5 amps each. Outlet it plugs into is connected to a 30amp breaker on the main panel. There's other items on that run - lights in the hobby room, outlet for the airbrush compressor, soldering station, Dremel station - but I've yet to trip that breaker...though not everything is run at the same time.

 

How much does it pull? 10 amps at initial charge, dropping to 1-2 amps when the battery is full and it's on maintenance mode.

 

Note that a 36v battery needs a 36v charger - NOCO has that, but it's industrial rated and comes in at $600. I'd go with the Dakota Lithium charger - 36v, 8 amps, will charge up a 100ah battery in 12 hours from full discharge (a rare occurrence) for $199. Lithium chargers, like batteries, aren't cheap if you want quality...I wouldn't 'settle' for one of those under $100 chargers from Amazon - don't know what kind of damage they'll do to a BMS.

[padlin]

I can’t find specs for the overhead loss by the charger but 40 amp at 12vdc is only 3.3 amps at 12vac. If you don’t get a satisfactory answer you can pick up a Kill A Watt for $30 and see what your charger is actually pulling.

[Bandersnatch]

5 minutes ago, MN Fisher said:

I'm running a 12v 5x2 - 10 amps total into two banks of 5 amps each. Outlet it plugs into is connected to a 30amp breaker on the main panel. There's other items on that run - lights in the hobby room, outlet for the airbrush compressor, soldering station, Dremel station - but I've yet to trip that breaker...though not everything is run at the same time.

 

How much does it pull? 10 amps at initial charge, dropping to 1-2 amps when the battery is full and it's on maintenance mode.

 

Note that a 36v battery needs a 36v charger - NOCO has that, but it's industrial rated and comes in at $600. I'd go with the Dakota Lithium charger - 36v, 8 amps, will charge up a 100ah battery in 12 hours from full discharge (a rare occurrence) for $199. Lithium chargers, like batteries, aren't cheap if you want quality...I wouldn't 'settle' for one of those under $100 chargers from Amazon - don't know what kind of damage they'll do to a BMS.

Just a reminder that just about everything considered quality at a higher price is Chinese branded and marketed for profit margin by us companies 

[MN Fisher]

1 minute ago, Bandersnatch said:

Just a reminder that just about everything considered quality at a higher price is Chinese branded and marketed for profit margin by us companies 

Except NOCO is a US company that designs their chargers in Ohio....made over in Asia, but US engineered.

 

Dakota Lithium's main manufacturing facility is in Grand Forks, ND, USA.

[Bandersnatch]

This entire thing is a math question. Purchasing more expensive vs less, USA made vs not does not change the math. I'm seeking to understand why the chargers don't tell you what they pull in and what they are. 

[MN Fisher]

11 minutes ago, Bandersnatch said:

I'm seeking to understand why the chargers don't tell you what they pull in

They do tell you - a 36v8a charger draws 288 watts of power (36x8)...if it's only 50% efficient, then it needs 576 watts. Divide by 120v for the outlet - and it's max draw from the house is 4.8amps of house current.

 

11 minutes ago, Bandersnatch said:

what they are. 

They are rated - my NOCO has different modes - flooded (standard car battery), AGM (also for Gel-Cells) and Lithium. unless your charger is rated for the battery type your using, you can cause damage to the battery that's NOT covered by warranty.

[casts_by_fly]

2 hours ago, Bandersnatch said:

for example two different boats (friend and mine) with two different chargers

 

I have a dual pro 2009 ranger 40amp four bank (10 amp per bank i suppose) 

 

He has a pro mariner pro tournament 36 amp four bank 

 

I'm removing my 3 lead acids and going with one 36v lithium and I'm going to likely keep my old dual pro for now and purchase a cheap 36v charger.

 

What I don't understand is how many AMPS from the outlet (110v) that the chargers actually pull. In a specific situation (canada trip) I have to pull off of one single 15 or 20 (can't remember) amp outlet. 

 

Obviously a 15 amp outlet can't pull more than 15 constant amps otherwise the breaker would trip

 

Question 

If I'm using the dual pro 4 bank with only one lead I assume it's only going to pull enough for 10 amps for that battery but what actually amps from the outlet will it be pulling?

 

The same goes for my other charger which we will say will be a 20amp 36v charger. How many constant amps from the outlet will it pull ? 

 

Is the charger the one upping the amps? Point is, I don't want this 15-20amp breaker constantly tripping. 

 

The Amps specified on the chargers are for 12V.  You're pulling at 120.  So for easy math, take the 12V number of Amps and divide it by 10.  Then add up all of the 12V banks.  So your buddy has 36 A (assuming he's using it all)and you have another 10.  That's 46A at 12V, or 4.6A at 120.  You could do that twice over safely without worrying about blowing a breaker.  Now that's the charging rate and doesn't count the losses. Looking up your buddys charger, the data sheet says the max amps of VAC 110 is 10A.   So if you both plug in your onboard chargers at the same time you might overdraw the circuit.

 

I can't find an easy spec sheet for a 36V lithium charger, but the power draw is going to be comparable to a 3x12V system.  So your buddy's charger in a 24A 3 bank pulls 7.5A at the wall. 

 

It looks like if you only have one wall outlet to work from, then one of you can charge at a time.

 

https://cxjdfr.files.cmp.optimizely.com/download/assets/ProTournamentelite+Data+Sheet.pdf/6e60d4fa71b811efa8d6d698ae9b14d8

[Bandersnatch]

7 hours ago, casts_by_fly said:

 

The Amps specified on the chargers are for 12V.  You're pulling at 120.  So for easy math, take the 12V number of Amps and divide it by 10.  Then add up all of the 12V banks.  So your buddy has 36 A (assuming he's using it all)and you have another 10.  That's 46A at 12V, or 4.6A at 120.  You could do that twice over safely without worrying about blowing a breaker.  Now that's the charging rate and doesn't count the losses. Looking up your buddys charger, the data sheet says the max amps of VAC 110 is 10A.   So if you both plug in your onboard chargers at the same time you might overdraw the circuit.

 

I can't find an easy spec sheet for a 36V lithium charger, but the power draw is going to be comparable to a 3x12V system.  So your buddy's charger in a 24A 3 bank pulls 7.5A at the wall. 

 

It looks like if you only have one wall outlet to work from, then one of you can charge at a time.

 

https://cxjdfr.files.cmp.optimizely.com/download/assets/ProTournamentelite+Data+Sheet.pdf/6e60d4fa71b811efa8d6d698ae9b14d8

Thank you