Pure sine wave inverter suggestions?

[Geewizard]

I'd like suggestions for a 1000W pure sine wave inverter.

[Geewizard]

No worries, 2112.

[2112]

I'm sorry I got your hopes up only to tell you this converter won't work for your application.

2 problems:
It's only good for 360W at 12V
If you do indeed have a smart charger, you can't replace it with this converter and expect it to work without developing additional circuits. The BMS tells the charger what to do.

We were debating if you should without determining if you could.

FWIW: I have 3 of these converters in use for different purposes without issue. One boosts my TV voltage to my FW battery to a constant 14.2V to recharge my battery while driving if needed. I have a toggle switch to remove it from circuit if not needed. Another in my boat to recharge my 24V trolling motor battery bank. The third runs a 48V hoist. I have a fourth on the shelf as a spare but haven't needed it.

[Geewizard]

2112 wrote:
What's your charge current requirement? Are they lithium batteries with internal battery management system?

The factory charger has an output of 48VDC, 650W maximum, 13.5A maximum.
I don't know exactly what the battery will draw.....yet. And yes, it is a LiFePO4 battery with a built-in BMS.

[time2roll]

+1 to stick with providing sine wave 120 volt power to the factory charger on a lithium electric bike.

[2112]

What's your charge current requirement? Are they lithium batteries with internal battery management system?

[Kayteg1]

Regardless if we call DC to DC converter an inverter, or not, Wikipedia gives them typical efficiency 75% to 98%, where I believe 98% applies t step-down converters. Meaning they don't have to be more efficient than inverter + converter combo.
Owners of those report them getting really hot, what not only raise efficiency questions, but also brings additional hassle about finding placement with good ventilation in stuffed camper .

[Geewizard]

I like the idea of that voltage converter. I could use it to charge the bike battery directly with 12VDC input and 45VDC output.

On a sunny day, I could even, theoretically, charge directly from the solar panels.

Believe me, I know that going from DC -> Inverter -> AC charger -> DC battery charging is inefficient. I am looking for better options but the last thing I want to do is damage that $800-1000 bike battery....or myself.

2112, thanks for the idea.

[2112]

Kayteg1 wrote:

2112 wrote:
I think that thing generates 150kHz DC pulses and smoothes and regulates them to a higher DC output voltage very efficiently. It's a DC input switching power supply. Going through an inverter to create true AC, and then an AC to DC charger is an inefficient, but simple approach. Maybe 70% efficient at best.

So you are saying that generating modified wave and stepping up voltage is not making it inverter?
I tought I know something about electricity, but evidently not.

Maybe our definition of an inverter differ.

Regardless, I was just pointing out an efficient alternative to OP if it meets his power requirements.

[Kayteg1]

2112 wrote:
I think that thing generates 150kHz DC pulses and smoothes and regulates them to a higher DC output voltage very efficiently. It's a DC input switching power supply. Going through an inverter to create true AC, and then an AC to DC charger is an inefficient, but simple approach. Maybe 70% efficient at best.

So you are saying that generating modified wave and stepping up voltage is not making it inverter?
I tought I know something about electricity, but evidently not.

[2112]

Kayteg1 wrote:

Geewizard wrote:

2112 wrote:

Geewizard wrote:
I need to charge an electric dirt bike. Its charger is AC only and I will pay the extra for a pure sine wave inverter. I had a MSW inverter for my microwave and it really did not like the MSW.

My CPAP runs from 12VDC.

Thanks all.

Why not just boost the DC with something like THIS? There is a lot of loss converting DC to AC then back to DC

That's an interesting product. Thanks, I'll look into it.

What do you think that thing is?
DC to DC chargers are inverters with converters in the same unit.

I think that thing generates 150kHz DC pulses and smoothes and regulates them to a higher DC output voltage very efficiently. It's a DC input switching power supply. Going through an inverter to create true AC, and then an AC to DC charger is an inefficient, but simple approach. Maybe 70% efficient at best.

[Kayteg1]

Geewizard wrote:

2112 wrote:

Geewizard wrote:
I need to charge an electric dirt bike. Its charger is AC only and I will pay the extra for a pure sine wave inverter. I had a MSW inverter for my microwave and it really did not like the MSW.

My CPAP runs from 12VDC.

Thanks all.

Why not just boost the DC with something like THIS? There is a lot of loss converting DC to AC then back to DC

That's an interesting product. Thanks, I'll look into it.

What do you think that thing is?
DC to DC chargers are inverters with converters in the same unit.

[jimh406]

As far as wire size goes, that has to do with length as well. Without knowing how far the run is from the inverter to the battery, it’s hard to say what wire size is appropriate.

Pure vs Modified used to have a lot do with price, but as cheap as the PSW’s are, I can’t see a lot of reason to buy a MSW right now. That being said, I think some devices like a cell phone charger or voltage adapter on a TV probably won’t care since they just step down the voltage and convert AC to DC.

[jaycocreek]

I have been looking for the same...It's hard to overlook the GoWise and the Kinverch (Potek)1000W,both under $150..

[Geewizard]

2112 wrote:

Geewizard wrote:
I need to charge an electric dirt bike. Its charger is AC only and I will pay the extra for a pure sine wave inverter. I had a MSW inverter for my microwave and it really did not like the MSW.

My CPAP runs from 12VDC.

Thanks all.

Why not just boost the DC with something like THIS? There is a lot of loss converting DC to AC then back to DC

That's an interesting product. Thanks, I'll look into it.