Ebike battery inverter DC to AC power.

[Offroader]

My bike has a 3.3 KW battery, it would be nice to use it as a source of AC power in certain instances. It could run things for a very long time. I could run my desktop computer with two monitors for over 15 hours.

I was wondering if anyone knows of any reasonably priced DC to AC inverters that work on higher DC voltage. Or any ideas on how to do this.

I can't seem to find any.

 

[Offroader]

I guess I would need something like this, I wish they displayed the voltage input in more detail. I would think the 72 volt one may have the voltage range I would need.

My voltage range is from 66 volts to 82 volts.

https://www.aliexpress.com/item/LED-Display-Reliable-Factory-Off-800W-Continuous-1600w-Peak-Pure-Sine-Wave-Solar-Power-Battery-Back/32480936613.html?spm=2114.01010208.0.217.XZzymE

 

[Offroader]

I guess I answered my own question, found this inverter after I wrote this post.

I got a reply back from the aliexpress seller about the 72 volt input version I posted above.

He said the following.

Thank you for your contact.
The range of 72v input is about 60v-85v.
If any problem please contact with me again.
Thanks and best regards.


This unit would work perfect for my bike voltage range of 66 to 84 volts which is a 3.3 to 4.2 volts per cell. They have higher wattage power inverters also.

https://www.aliexpress.com/item/LED-Display-Reliable-Factory-Off-800W-Continuous-1600w-Peak-Pure-Sine-Wave-Solar-Power-Battery-Back/32480936613.html


Of course you always have to question the quality and accuracy of anything you buy from china, but this is like the only product I can find that will work in my voltage range. For $95 dollars this would make my 3.3 KW battery pack a nice mobile power source for emergencies and stuff like that. Stuff that of course you will probably never use LOL. But it would still be cool knowing that your bike could power a lot of AC things for a long time.

I know when the power goes out at my house, many times it works over at a relatives house, and I even know someone with a gas generator. I could charge my bike there and then have it power stuff in my house.

Right now my PC is drawing 150 watts, with this inverter at 90% efficiency I could run my dual monitor 27" desktop computer for about 17 hours from my bike, with a 3.3 to 4.1 voltage range. I could also use it to power stuff to make food, like my blender.

For $95 dollar I may buy one to play with it. Waiting to see if anyone sees any issues with it before buying.

I already know what you guys are thinking, "why not just get a gas generator", LOL. I've already decided that it isn't worth it considering how rarely there are power outages. I think it is stupid for those people who buy those big things and they take up space, and they never use them.

 

[DVDRW]

You can check those old UPS-es. Some are 72Volt versions.
Dumster dived Powerware 9125 1900W. Works perfectly with my 68v-92v 4Kw/h triangle pack.
http://i.imgur.com/xUXNges.jpg

 

[titusmc]

I recently bought a 48V 1500W pure sine wave inverter off eBay (paid around $200) to use with my 52V 14S packs (around 7 kWh if all used in parallel). I was skeptical about the pure sine claim, but it runs some AC box fans I have without any noticeable difference from wall power, so I assume it's a decent sine wave.

I don't use it much now, but it will be great to have if the grid ever goes down here.

 

[Offroader]

You can check those old UPS-es. Some are 72Volt versions.
Dumster dived Powerware 9125 1900W. Works perfectly with my 68v-92v 4Kw/h triangle pack.
http://i.imgur.com/xUXNges.jpg

That is an interesting way to get the AC power. How do they work at that higher battery voltage, they are designed to hold maybe 4 lead acid batteries, so should be rated at 48 volt input?

How did you determine this would take the higher voltage?

 

[DVDRW]

Was designed for 6x 12v SLAs in series. Throw out SLA-s and replace it with xt-60 connector and thats it.

 

[Offroader]

Thanks a lot for the tip, this makes a lot more sense. These units are high quality also.

I actually found a post about someone who bought one of those 72 volt china inverters and he said it blew up in 5 minutes at 80% load. Not going to take a chance with that when I can get one of these.

Do you think it will work all the way down to 66 volts? I wonder what the voltage cut off is in the unit. I assume it must be a cut-off under load.

 

[Offroader]

Nice, I bought a Dell 2000 watt UPS unit similar to the one like DVDRW recommended, which uses a 72 volt lead acid battery.

It works exactly as intended. Some things I was concerned with were how low the voltage could go and the UPS unit to still run, as I needed it to run all the way down to at least 66 volts to get full use of my battery.
I was also worried if the unit would shut off if run too long on battery.

My 20S pack voltage range is 66 to 82 volts or 3.3 to 4.1 volts.

Unit worked perfectly all the way down to 65 Volts or 3.25 volts per cell and it would go lower but I shut the unit off. The unit also didn't shut off after running my computer for a few hours.

The Dell UPS will run at low voltage if left running on batteries, but it won't start on battery if the voltage is too low. It does start at 72 volts, but not at 65 volts. Just something to consider, as I have not tried to find out what voltage under 72 volts that it won't allow to start on battery.

It is nice knowing I can now use my 3.3 KW pack to run up to 2000 watts AC.