power converter charger?

Anything electric, AC or DC

power converter charger?

Postby Wellcraft290 » Mon Nov 25, 2019 4:26 pm

Which amp would you recommend? all about the same price. just wondering if 60 amp would be way too much or would it just charge the batteries faster?
https://www.amazon.com/gp/product/B01ER ... 4JRX&psc=1

plan on having AC, tv, fan, typical stuff. stereo
Wellcraft290
Teardrop Builder
 
Posts: 36
Joined: Sat Nov 16, 2019 6:09 am

Re: power converter charger?

Postby John61CT » Mon Nov 25, 2019 6:11 pm

Amps and type of regulation depends on the chemistry and Ah capacity.

Describe your bank, and how many hours you have shore power available.

Also your genset if any.
John61CT
1000 Club
1000 Club
 
Posts: 1375
Joined: Thu Nov 17, 2016 4:36 pm

Re: power converter charger?

Postby tony.latham » Mon Nov 25, 2019 7:14 pm

plan on having AC, tv, fan, typical stuff. stereo


What do you want this box to do? Charge the battery? Or power the DC stuff?

Why not a Progressive Dynamics box?

T
User avatar
tony.latham
Gold Donating Member
 
Posts: 3953
Images: 17
Joined: Mon Jul 08, 2013 4:03 pm
Location: Middle of Idaho on the edge of nowhere
Top

Re: power converter charger?

Postby John61CT » Mon Nov 25, 2019 7:21 pm

Any decent charger / converter (same thing really) will do both just fine.

Setpoint adjustability is sometimes a real plus.

But amps rate the real question
John61CT
1000 Club
1000 Club
 
Posts: 1375
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: power converter charger?

Postby RJ Howell » Tue Nov 26, 2019 7:47 am

I have a 30a service in my commercial trailer. Runs all the typical stuff. I have a 60a in my workshop..

Seems a bit big to me..
RJ Howell
The 300 Club
 
Posts: 424
Images: 34
Joined: Sat Jul 27, 2019 6:08 am
Top

Re: power converter charger?

Postby Wellcraft290 » Tue Nov 26, 2019 8:58 am

Will have one 100 ah battery at first then two. Really just normal items being run, but the price is basically the same. Just wondering if too much is a bad thing. I mean if was double the price etc wouldn't consider it but the 60 amp and 30 amp are basically identical in price.

just trying to determine if any downside to too many amps. will use to power the 12v items when hooked to shore power and to charge the battery. seems to have a 4 stage charging system.
Wellcraft290
Teardrop Builder
 
Posts: 36
Joined: Sat Nov 16, 2019 6:09 am
Top

Re: power converter charger?

Postby RJ Howell » Tue Nov 26, 2019 12:21 pm

Assuming you have distribution box you'll be running this into, then 60a supply is not going to matter. You'll be fusing the appliances in the distribution box. 3 stage/ 4 stage chargers mean little to me as 'can I set' the modes of charge is more important to me. I don't like generic settings..
RJ Howell
The 300 Club
 
Posts: 424
Images: 34
Joined: Sat Jul 27, 2019 6:08 am
Top

Re: power converter charger?

Postby Wellcraft290 » Tue Nov 26, 2019 12:28 pm

well planning on a similar setup to this


https://www.youtube.com/watch?v=HeNZgiKPFnA
Wellcraft290
Teardrop Builder
 
Posts: 36
Joined: Sat Nov 16, 2019 6:09 am
Top

Re: power converter charger?

Postby John61CT » Tue Nov 26, 2019 2:20 pm

Absolutely no downside to 60A if it only costs a bit more, nor 600A

max amps is legal CYA, except maybe GEL chemistry

AGM 0.4C is the minimum I would do, for longevity.
John61CT
1000 Club
1000 Club
 
Posts: 1375
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: power converter charger?

Postby Trebor English » Tue Nov 26, 2019 3:39 pm

Your battery has a max charge current rating. You want two batteries so double that. When charging the battery at the absorption voltage the current will taper off. However, if the batteries are deeply discharged they can take a lot of amps before going over 14.4 volts when first plugged in. I would not go bigger than 50% more than the max combined battery current rating.

If you have, for example, an Eu1000 generator, 7.5 amps at 120v, 900 watts, continuous, a 60 * 15 = 900 watt charger might have a startup problem and the generator might not be enough at a higher elevation. A 45 amp 675 watt max charger might work better. With a 30 amp plug in, that's not an issue.
Trebor English
Gold Donating Member
 
Posts: 36
Joined: Sun Jul 10, 2016 5:42 pm
Location: Melbourne, Florida
Top

Re: power converter charger?

Postby tony.latham » Tue Nov 26, 2019 6:21 pm

I'm scratching my head on why you want to convert 110 volts to 12 volts when you have a battery.

I get why it would be a good thing to have a charger cooking away while hooked up to shore power. A smart charger would cost about $60 and you could select FLA or AGM...

Educate me?

Tony
User avatar
tony.latham
Gold Donating Member
 
Posts: 3953
Images: 17
Joined: Mon Jul 08, 2013 4:03 pm
Location: Middle of Idaho on the edge of nowhere
Top

Re: power converter charger?

Postby bdosborn » Tue Nov 26, 2019 7:34 pm

The rule of thumb for maximum flooded cell battery life is to charge at a C/8 rate or battery amp-hrs divided by 8. So if your goal is 200Amp-hr battery bank you should pick a 200/8=25 amp charger for maximum battery life. People bump up the charge rate in order to charge faster at the cost of reduced battery life.

AGM batteries can be charged at up to C*4 rate, or 400% of the capacity for the bulk charge cycle for a short period. The battery charger and cables would be huge at that rate, most people limit the charge rate to C/4 or so.

My LiFePO4 battery has a C/3 charge rate, so 54 amps in my case. I use an Iota 45A charger with a LiFePO4 charge controller.

NAWS Link

Bruce
2009 6.5'X11' TTT - Boxcar
Image
Boxcar Build
User avatar
bdosborn
Donating Member
 
Posts: 4483
Images: 482
Joined: Wed May 05, 2004 11:10 pm
Location: CO, Littleton
Top

Re: power converter charger?

Postby John61CT » Tue Nov 26, 2019 8:30 pm

AGM **needs** a high rate for longevity, much higher than most owners ever provide.

FLA will merrily bubble away, no problem as long as you keep the water up.

Of course it is critical that the right **voltage** is held until endAmps is reached, at which point stop charge, drop to Float.

But, again, there is NO lead battery that will suffer ANY harm from "too high" a current available.

The chemistries are self-limiting, simply will not, cannot accept more amps than they can handle.

Other than GEL, special case.
John61CT
1000 Club
1000 Club
 
Posts: 1375
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: power converter charger?

Postby John61CT » Tue Nov 26, 2019 8:35 pm

bdosborn wrote:My LiFePO4 battery has a C/3 charge rate, so 54 amps in my case.

BMS may impose a limit but the cells themselves can draw multiple C-rate if available.

But allowing that hurts longevity.

0.3-5C is fine in warmish weather, stay lower in the cold.

At very high temps very little loss of cycles right up to 0.8C even higher.

Really discussions of lead and LFP are so different, should be in separate threads, too confusing for newbs, irrelevant to the OP.
John61CT
1000 Club
1000 Club
 
Posts: 1375
Joined: Thu Nov 17, 2016 4:36 pm
Top

Re: power converter charger?

Postby John61CT » Tue Nov 26, 2019 8:37 pm

tony.latham wrote:I'm scratching my head on why you want to convert 110 volts to 12 volts when you have a battery.
Called charging. Same as "converters" so called traditionally by the US RV industry.

A good quality unit sized right for a big deep cycling bank can easily cost $400+

Cheap garage style chargers have little place in that context.
John61CT
1000 Club
1000 Club
 
Posts: 1375
Joined: Thu Nov 17, 2016 4:36 pm
Top

Next

Return to Electrical Secrets

Who is online

Users browsing this forum: No registered users and 5 guests