Mecer Inverter

TheChamp said:
Make sure the unit is off, as in off on the button and powered off the wall before adding the battery.

What battery brand are you using?
Click to expand...
New battery is:
GeeWiz 12100L 1.2kWh 12V 100Ah Lithium Ion LiFePO4
  • 2.8V 1.2KWh
  • Rating: 1C
  • Maximum continuous discharge: 100Amp
  • Cells: 1st life prismatic LiFePO4
Old battery - not sure - but not lithium.
Can I use the old battery to boost or is that a bad idea?
 
dazza1967 said:
New battery is:
GeeWiz 12100L 1.2kWh 12V 100Ah Lithium Ion LiFePO4 5000 Cycle Battery (FIRST LIFE CELLS) - 3 Year Unlimited Cycles Warranty - 5000 Cycles
Old battery - not sure - but not lithium.
Can I use the old battery to add or is that a bad idea?
Click to expand...
You can, the grand idea is to wake the inverter and hopefully the battery, as soon as that has happened you will remove the old battery, even the gate motor battery can do the trick.
 
dazza1967 said:
I was getting 13v from the new battery before installation.
I will add the old battery to the external ports and see if that works. It was still working before I changed batteries.

Thank you
Click to expand...
It should work if there is voltage. Not a bad idea to add the old battery to external port to help with jump starting issue if LFP battery is ever drained completely, but in this case it won't make any difference as there is voltage already.
 
TheChamp said:
You can, the grand idea is to wake the inverter and hopefully the battery, as soon as that has happened you will remove the old battery, even the gate motor battery can do the trick.
Click to expand...
Let me give it a go. I was getting a very low voltage from the battery connections on the circuit board.
It does sound like an undervoltage battery ( I hope )
Thank you
 
dazza1967 said:
Hi
I have just installed a Lihtium battery to the Mecer sol i bb m1.
The unit will now not power up even when the power supply is connected.
Does that mean the battery is under charged or is there something else I am misiing?
GeeWiz 12100L 1.2kWh 12V 100Ah Lithium Ion LiFePO4 5000 Cycle Battery (FIRST LIFE CELLS) - 3 Year Unlimited Cycles Warranty - 5000 Cycles
Click to expand...
To power up, did you press/switch "ON" the ON/OFF Button (10)
SOL I BB M1 ON_OFF Button.jpg
 
wingnut771 said:
but there is voltage already, why won't it wake up?
Click to expand...
Maybe the bms wake up voltage is higher

Ie my jkbms wanted a few volts more than internal battery voltage, ie something like 3-4 volts more but yea that is a 48v system. And that was for initial startup

Which was a bit of a bugger as the cells was full when i fitted it , so connecting the other battery parallel wasn't enough

But even then the reading from the inverter should be higher than 8v?
 
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leon.davibe said:
Maybe the bms wake up voltage is higher

Ie my jkbms wanted a few volts more than internal battery voltage, ie something like 3-4 volts more but yea that is a 48v system. And that was for initial startup

Which was a bit of a bugger as the cells was full when i fitted it , so connecting the other battery parallel wasn't enough

But even then the reading from the inverter should be higher than 8v unless there is a short somewhere pulling down the voltage
Click to expand...
13V is awake.
 
wingnut771 said:
13V is awake.
Click to expand...
Yes it was 13v before he installed

After 8

Hence why i was wondering if the reason for replacing the battery was just because old battery wasn't just lasting long enough or a catastrophic event

And he just assumed the battery is dead buy a new one

ie was the inverter working perfectly pre battery swop ?
 
leon.davibe said:
Yes it was 13v before he installed

After 8

Hence why i was wondering if the reason for replacing the battery was just because old battery wasn't just lasting long enough or a catastrophic event

And he just assumed the battery is dead buy a new one

ie was the inverter working perfectly pre battery swop ?
Click to expand...
The way I understood it was the voltage at battery terminals was 13V and on the other side of the cable at the inverter it is 8V. Not sure how that is possible.

Does it work with the old battery but not with the new.

I suspect that its working now as no news is good news.
 
wingnut771 said:
The way I understood it was the voltage at battery terminals was 13V and on the other side of the cable at the inverter it is 8V. Not sure how that is possible.

Does it work with the old battery but not with the new.

I suspect that its working now as no news is good news.
Click to expand...
Yea in another thread he mentioned 13v before fitting

And measuring 8v on the other side after fitting

Think as you say maybe he just jumped it and all working

Maybe the capacitor initial inrush just tripped it overload, and the jumpstart woke it up
 
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wingnut771 said:
The way I understood it was the voltage at battery terminals was 13V and on the other side of the cable at the inverter it is 8V. Not sure how that is possible.

Does it work with the old battery but not with the new.

I suspect that its working now as no news is good news.
Click to expand...
I tried jumping this morning with the old battery. That did not work.
All that is happening is that when you plug in the mains, the 3 LED lights on the display flash for a second, and then you try pushing the On button with no response.
The unit was working perfectly prior to the battery exchange. Just poor battery life.
Any other ideas please?
 
dazza1967 said:
I tried jumping this morning with the old battery. That did not work.
All that is happening is that when you plug in the mains, the 3 LED lights on the display flash for a second, and then you try pushing the On button with no response.
The unit was working perfectly prior to the battery exchange. Just poor battery life.
Any other ideas please?
Click to expand...
How is it possible to read 13V on the one end of the cable and 8V on the other end?
 
dazza1967 said:
I tried jumping this morning with the old battery. That did not work.
All that is happening is that when you plug in the mains, the 3 LED lights on the display flash for a second, and then you try pushing the On button with no response.
The unit was working perfectly prior to the battery exchange. Just poor battery life.
Any other ideas please?
Click to expand...
How exactly did you jump it? And did you check if your jumping battery is not dead?
 
I have heard some say that in rush can pop a device

Ie if the caps are drained , when you first connect the battery you often get a spark as those caps soak up energy

Often it can pull loads of amps

The correct way they say is to attach one wire then have a resistor between the other wire and the terminal to charge up the cap slowly then remove resistor and attach the cable

I don't have a resistor lying around , so
what i do is just tap the second wire and deal with the sparks (have sunglasses or safety glasses on) then when it does not spark anymore it means the cap is charged up and i attach the wire hoping that not a lot of amps can flow with the taps ie not a proper connection

Have heard others say they have connected and then flip the battery breaker and let it flow without problems

I maar heed the old wifes tales in case
it isn't just a myth
 
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