May 23, 20233 yr Item: 4 x Mecer 12V 200Ah Lithium Age: 3 Weeks Price: R8800 each Payment Method Accepted: EFT Warranty: 2 years Packaging: Sealed / Unused Condition: Brand New Location: Cape Town Reason: Surplus stock from an install Shipping: R200 per battery via The Courier Guy Collection: Can be arranged Link: https://www.takealot.com/mecer-lifepo4-12-8v-200ah-lithium-battery-sol-b-l-m200/PLID91577930 Edited May 23, 20233 yr by Chris.P.Bacon
May 23, 20233 yr 5 hours ago, Flouw said: will these work with the small 720w Mecer inverters? The voltage curve is too low afaik,you need an adjustable voltage unit (or external charger)
May 24, 20233 yr Yes, it will work. I have a 12V 100A LiFePo4 connected to a 720w Mecer inverter. However, the charge switch MUST only be set to 10A and not 20A. If you do that, the inverter will eventually fail. This is well documented in the mybroadband thread. Other small catch is that if you drain the battery enough, then the battery BMS will turn off the battery. When the power comes back the inverter won't turn on as there is no battery voltage and hence cannot start charging the battery. Solution is to use a voltage source that is high enough e.g. 13.8V and connect it momentarily to the inverter battery terminals. This will wake up the BMS and allow the inverter to turn on and charging to commence. For safety I only use a power supply that is isolated e.g. ye olde transformer based psu. Yes the Mecer does charge the battery at below the ideal 14.0V but so far so good and if necessary I will hook up a 14.0V (isolated) PSU to the battery to let the BMS balancer do its thing. 14.2 V is probably even better.
June 1, 20233 yr On 2023/05/24 at 12:06 PM, GreenMan said: Yes, it will work. I have a 12V 100A LiFePo4 connected to a 720w Mecer inverter. However, the charge switch MUST only be set to 10A and not 20A. If you do that, the inverter will eventually fail. This is well documented in the mybroadband thread. Other small catch is that if you drain the battery enough, then the battery BMS will turn off the battery. When the power comes back the inverter won't turn on as there is no battery voltage and hence cannot start charging the battery. Solution is to use a voltage source that is high enough e.g. 13.8V and connect it momentarily to the inverter battery terminals. This will wake up the BMS and allow the inverter to turn on and charging to commence. For safety I only use a power supply that is isolated e.g. ye olde transformer based psu. Yes the Mecer does charge the battery at below the ideal 14.0V but so far so good and if necessary I will hook up a 14.0V (isolated) PSU to the battery to let the BMS balancer do its thing. 14.2 V is probably even better. So it will never charge the battery to 100% and if you run it too low, you need to provide external power to "jump start" the battery BMS in order for the inverter to work again. Any idea what sort of KWH usage one could actually use from a 12V 100AH LiFePo4 battery on a 720W Mecer inverter? For example, the battery would have 1.2KWH in theory, with an 80% DoD that would mean you could get 0.96KWH out of the battery. With the inverter not being able to charge the battery to 100% how much would one be loosing from the usable capacity of the battery? Any ideas?
June 1, 20233 yr 22 minutes ago, PsyCLown said: So it will never charge the battery to 100% and if you run it too low, you need to provide external power to "jump start" the battery BMS in order for the inverter to work again. Any idea what sort of KWH usage one could actually use from a 12V 100AH LiFePo4 battery on a 720W Mecer inverter? For example, the battery would have 1.2KWH in theory, with an 80% DoD that would mean you could get 0.96KWH out of the battery. With the inverter not being able to charge the battery to 100% how much would one be loosing from the usable capacity of the battery? Any ideas? I can just say my Hubble S-100 measure close to 110Ah when I did a load test. As much as we talk about the BMS switching off. The moment you have this the battery will always bounce back and I find it strange that other batteries don't bounce back. I just tested a new 12V 7Ah and removing load at about 50% SOC it bounced back from 12.38 to 13V. Tested on a 1.25A gate motor transformer based PSU and it works fine.
June 1, 20233 yr This graphic is from the looooong thread on mybroadband.co.za discussing these Mecer inverters. Speaks for itself!
June 6, 20233 yr On 2023/05/23 at 9:52 AM, Chris.P.Bacon said: Item: 4 x Mecer 12V 200Ah Lithium Age: 3 Weeks Price: R8800 each Payment Method Accepted: EFT Warranty: 2 years Packaging: Sealed / Unused Condition: Brand New Location: Cape Town Reason: Surplus stock from an install Shipping: R200 per battery via The Courier Guy Collection: Can be arranged Link: https://www.takealot.com/mecer-lifepo4-12-8v-200ah-lithium-battery-sol-b-l-m200/PLID91577930 Hi Chris Do you have any left ?
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