Navasolar Trolley Inverters

[Tech Guy SA]

I added 25W for losses as the load was 400W so did the sums with 425W. Anyway, the test lasted 2h15, so the evidence backs me up.

Not sure what you're going on about. Do you want him to return his device?

noted but my maths is accurate

and no if it was faulty which it is not i would of sent couriers to collect it by now.

He had a concern and its been delt with i wasnt too sure until technican explained the gelvs lithium (refresher for me). but wanted evidence which they gave.

I dont just send stuff up to technical becomes a waste of time and money to just send things up and down.

 

[wingnut771]

noted but my maths is accurate

and no if it was faulty which it is not i would of sent couriers to collect it by now.

He had a concern and its been delt with i wasnt too sure until technican explained the gelvs lithium (refresher for me). but wanted evidence which they gave.

I dont just send stuff up to technical becomes a waste of time and money to just send things up and down.

How did you determine it wasn't faulty?

 

[Tech Guy SA]

How did you determine it wasn't faulty?

Unsure if you trolling at this point.

Re read it. he has 1280Wh and on 400w tested he had ran for aprox 2h17m which is close to my 2h30m approximately

= succeess

IF he said it ran for 40mins and died then i would of told him okay lets book it for example.

again forget about the voltages.

anything regarding this after post im going to ignore cause then its just spamming if you dont understand it thats fine the explanations are all there.

 

[wingnut771]

Unsure if you trolling at this point.

Re read it. he has 1280Wh and on 400w tested he had ran for aprox 2h17m which is close to my 2h30m approximately

= succeess

IF he said it ran for 40mins and died then i would of told him okay lets book it for example.

again forget about the voltages.

anything regarding this after post im going to ignore cause then its just spamming if you dont understand it thats fine the explanations are all there.

So no thanks for helping you out. Got it.

 

[Tech Guy SA]

So no thanks for helping you out. Got it.

oh im sorry how Rude and silly nana of me.

Thank you for the post on a free platform.

and thank you to all those that involved themselves of their free time.

Ill be sure to see your post and Thank you for every single input you put out there.
I am terribly sorry to have cause this heartache that you felt the need to think i wasnt thankfull for your information shared on this platform.

 

[icantchooseone]

from my side im happy with the test knowing if i only had my laptop + 2 routers during a day outage and the on screen says its using around 60 to 70 watts i could last around 10 hours or more

 

[denmendez65]

Should last even more hey.

from my side im happy with the test knowing if i only had my laptop + 2 routers during a day outage and the on screen says its using around 60 to 70 watts i could last around 10 hours or more

I had a Lattepanda PC that used 25W hooked up to a monitor, WiFi and speakers. I had a GEL battery on my 1kVA inverter and it lasted about 16 hours easily.

Battery lasted 3 years and then I got Solar.

 

[Tech Guy SA]

from my side im happy with the test knowing if i only had my laptop + 2 routers during a day outage and the on screen says its using around 60 to 70 watts i could last around 10 hours or more

about 15hours yes more in a way since laptop you probably only going to plug it in when needed to charge

Should last even more hey.

I had a Lattepanda PC that used 25W hooked up to a monitor, WiFi and speakers. I had a GEL battery on my 1kVA inverter and it lasted about 16 hours easily.

Battery lasted 3 years and then I got Solar.

had a look at that i take it was peak 25? depends on monitor and speakers watt wise routers take next to nothing (4w on my mesh)
what size battery was it though seems pretty high if it was a 100ah although depends what the machine was doing and what the monitor is displaying (res and colours wise)

either way it works it works.

 

[denmendez65]

about 15hours yes more in a way since laptop you probably only going to plug it in when needed to charge



had a look at that i take it was peak 25? depends on monitor and speakers watt wise routers take next to nothing (4w on my mesh)
what size battery was it though seems pretty high if it was a 100ah although depends what the machine was doing and what the monitor is displaying (res and colours wise)

either way it works it works.

Yeah peak was 25. It was very efficient. Doing basic desktop tasks would be half. Monitor was some 25W if I recall.

 

[Tech Guy SA]

Yeah peak was 25. It was very efficient. Doing basic desktop tasks would be half. Monitor was some 25W if I recall.

sounds about right considering monitors in general are surprisingly low watts compared to a TV

 

[leon.davibe]

from my side im happy with the test knowing if i only had my laptop + 2 routers during a day outage and the on screen says its using around 60 to 70 watts i could last around 10 hours or more

Ok so if we take 1280wh and subtract 25% loss. That would leave us at 960wh with 400w load that should give approx 2hrs 21mjn run time


You got close so capacity isn't too bad

No the runtime with lower load cannot be calculated bassd on short run time

Ie the inverter self load stays the same so with less load the runtime will reduce ie the approx 100w device load stays so 400/500w load = 2.25hrs

Low load 100/200w would be 5.6hrs not the expected 9hrs

The fact that it died with very little beeping imo

Means that one cell is dictating the runtime

Normally the beeping is based on pack voltage

Likely the one cell running low caused the bms to do a low cell voltage protection shutdown

Normally it should be easy to run to 24v and hear lots of beeping but device stays on (bar the device has an early shutdown ie 20% etc whichnisn't easy to do on LFP)

As LFP cells are only empty at 2.5v
And almost done by 3v
But yea hitting 24v should be possible

And often ex lead acid devices have an ultimate shutdown of 20v

But yea all of these calculations are based on approx loss % which can be way off or not who knows

Is the device brand new?

If it is i would make the effort to test charge run time

example
note the charge amps and battery voltage lets say 1hrs 40min cahfge time
use amps 29A x 26.5v = 768wh x 1.66hrs (1+ 40/60) =1280wh

If you get less than rated i would return it

As it looks like it either has one cell that is sub par or out of balance battery pack out of the factory

No amount of give the bms time to balance the pack is possible

That is just bullshit they tell people to sooth them and hopefully not insist on swol out

Often devices are sold on special and they would refund and you can't buy the same specs for the same price

In this case each has to decide if the discount is worth the caoacity sacrifice

 

[icantchooseone]

Ok so if we take 1280wh and subtract 25% loss. That would leave us at 960wh with 400w load that should give approx 2hrs 21mjn run time


You got close so capacity isn't too bad

No the runtime with lower load cannot be calculated bassd on short run time

Ie the inverter self load stays the same so with less load the runtime will reduce ie the approx 100w device load stays so 400/500w load = 2.25hrs

Low load 100/200w would be 5.6hrs not the expected 9hrs

The fact that it died with very little beeping imo

Means that one cell is dictating the runtime

Normally the beeping is based on pack voltage

Likely the one cell running low caused the bms to do a low cell voltage protection shutdown

Normally it should be easy to run to 24v and hear lots of beeping but device stays on (bar the device has an early shutdown ie 20% etc whichnisn't easy to do on LFP)

As LFP cells are only empty at 2.5v
And almost done by 3v
But yea hitting 24v should be possible

And often ex lead acid devices have an ultimate shutdown of 20v

But yea all of these calculations are based on approx loss % which can be way off or not who knows

Is the device brand new?

If it is i would make the effort to test charge run time

example
note the charge amps and battery voltage lets say 1hrs 40min cahfge time
use amps 29A x 26.5v = 768wh x 1.66hrs (1+ 40/60) =1280wh

If you get less than rated i would return it

As it looks like it either has one cell that is sub par or out of balance battery pack out of the factory

No amount of give the bms time to balance the pack is possible

That is just bullshit they tell people to sooth them and hopefully not insist on swol out

Often devices are sold on special and they would refund and you can't buy the same specs for the same price

In this case each has to decide if the discount is worth the caoacity sacrifice

the device was in another room - the sliding doors to that room were closed and it was in a storage cupboard so i never heard the beep

device was refurbished with a 6 month warrantee