24 volt LifePo4 system with giandel inverter intermittent failure

[John Frum]

26.5v

I think we have isolated the problem to the inverter.
Suggest you have Giandel support read this thread.

 

[John Frum]

Your inverter is rated for 24 volts confirm?

 

[gives11]

thats right

 

[gives11]

picture of inverter which can handle 32 v i think

 

[John Frum]

picture of inverter which can handle 32 v i think

System voltage should never get that high

You BMSs should be set to...
cut off at 3.65 volts per cell or 29.2 volts for the pack
also cutoff at 2.5 volts per cell or 20 volts for the pack

Your charger should be set too..
bulk=3.55 per cell or 28.4 for the pack
float=3.35 per cell or 26.8 for the pack

 

[gives11]

its never gone above 26.5

At this stage I don't know how to set the batteries. I've asked the supplier for help as I need to access the bms. "UMXLI BMS"

 

[John Frum]

its never gone above 26.5

At this stage I don't know how to set the batteries. I've asked the supplier for help as I need to access the bms. "UMXLI BMS"

They should already be set to what I specified, its very common for an LFP BMS to be factory set to those values.

 

[gives11]

They should already be set to what I specified its very common for an LFP BMS to be factory set to those values.

Massive thank you for your time. New technology for me and my instincts told me it was the inverter but to have you isolate the problem is a major help.

I've emailed the thread to Giandel. I will post on here the outcomes.

In the meantime I'll reconnect my old 12 v inverter.

Really wanted it to work as the wife's coffee machine doesn't work on the old converter but thats an issue for another thread or forum.

 

[Bud Martin]

BTW, I see the cheap black circuit breaker with the red button, is it used for the inverter?

 

[elGriffo]

BTW, I see the cheap black circuit breaker with the red button, is it used for the inverter?

Hi Bud, just about to use one of these, 250A $65 from Altronics, is there a problem with them?

 

[Bud Martin]

Hi Bud, just about to use one of these, 250A $65 from Altronics, is there a problem with them?

Can you show the link to that breaker?

 

[elGriffo]

S5896 250A Surface Mount IP67 Waterproof Circuit Breaker - Altronics

250A Surface Mount IP67 Waterproof Circuit Breaker. Check website for full details at Altronics.com.au

www.altronics.com.au

 

[Bud Martin]

I download and look at the spec sheet, It looks like a clone of Cooper/Bussman circuit breaker.

 

[elGriffo]

I download and look at the spec sheet, It looks like a clone of Cooper/Bussman circuit breaker.

I'm afraid that doesn't mean much to me? Mad in Taiwan cloning a good quality cct brkr is that ok?

 

[Bud Martin]

The only way to find out is to buy one and put it into use and draw lots of current, check the Vdrops, temperature, inspect the build quality, etc.
Here is an example of bad cloned breaker.

 

[elGriffo]

The only way to find out is to buy one and put it into use and draw lots of current, check the Vdrops, temperature, inspect the build quality, etc.
Here is an example of bad cloned breaker.

Thanks Bud, I'll test it before I go away in the van

 

[Bud Martin]

Here is the example of BUSSMAN circuit breaker:

https://www.eaton.com/us/en-us/catalog/electrical-circuit-protection/high-amp-circuit-breakers.html

Eaton Bussmann 285 Series Resettable Circuit Breakers Surface Mount up to 150A

These high-amp, Type III circuit breakers are typically used in automotive auxiliary and accessory circuits for trucks, buses, RVs and marine applications. High-amp circuit breakers also have applications in battery charger systems and DC audio systems.

powerwerx.com

 

[elGriffo]

Here is the example of BUSSMAN circuit breaker:

https://www.eaton.com/us/en-us/catalog/electrical-circuit-protection/high-amp-circuit-breakers.html

Eaton Bussmann 285 Series Resettable Circuit Breakers Surface Mount up to 150A

These high-amp, Type III circuit breakers are typically used in automotive auxiliary and accessory circuits for trucks, buses, RVs and marine applications. High-amp circuit breakers also have applications in battery charger systems and DC audio systems.

powerwerx.com

Thanks.