Mecer 2400VA Inverter (Community Support) - Part 2

Finhobbyist said:
Another question regarding pv: If the panels give max amps and volts in good sunlight, do you rate your breaker for higher than the max, so it wont trip all the time?
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Yes, you rate it higher than the PV but lower than your cable because you don't want your cable melting. You don't want it tripping ever.
 
Finhobbyist said:
Another question regarding pv: If the panels give max amps and volts in good sunlight, do you rate your breaker for higher than the max, so it wont trip all the time?
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Yea makes sense

It does get more complicated though with parralel strings

ie a panel is rated to carry a certain amount of amps

So if you have 4 parralel strings of 10a on a low voltage mppt

You need fuses that is more than the 10a to prevent nuisance tripping

But appropriately sized (edit : fuse rating on sticker on panel ) to separate the strings in the event of a panel failure

To prevent all 40A to flow over the faulty panel and cause a fire
 
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It almost seems that a "smart" breaker that measures cable temp would be ideal....
 
Sorry to disappoint, but they're rated for 27amps, and there are 3 packs. Meaning a total of 81amps, 48v system that's 3888watts on a 2000w inverter, normal load is 200watts.

Fyi that's the test "bench", not permanent solution, waiting on my lithium for that
 
Zuner said:
Sorry to disappoint, but they're rated for 27amps, and there are 3 packs. Meaning a total of 81amps, 48v system that's 3888watts on a 2000w inverter, normal load is 200watts.

Fyi that's the test "bench", not permanent solution, waiting on my lithium for that
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OK, so 3 side cutters ;)
 
before you try at flick the solar breaker switch

removing/reducing the load from the inverter is a good idea

As when no load the panels will go to voc and amps drop of drastically at that point

Since the amps also play a big role

Especially on high voltage strings now yes if you have a dead short on panel side

as they do in this video it is a different story

They are testing shutdown in scenario unlike what most people are doing day to day

And may one day have to do

So yea it does highlight the importance of spending the extra cash on a good quality isolator
 
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I have this Mecer 2400va, 1440w. My load is 299w. I have 2 brand new deep cycle batteries and after an hour and 20 minutes. The display goes to 50 percent. Is this correct? Do these inverters show correct battery life? I can't afford lithium at the moment so these have to do.
 
carnagelan said:
I have this Mecer 2400va, 1440w. My load is 299w. I have 2 brand new deep cycle batteries and after an hour and 20 minutes. The display goes to 50 percent. Is this correct? Do these inverters show correct battery life? I can't afford lithium at the moment so these have to do.
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Two batteries? Alarm batteries? Specs? AH ratings?
The 2400va mecer is 24V, so I assume you have two 12V batteries in series? 100AH?
300W load x 1.33 hours = 400WH adjusted to 470WH due to inefficiencies.... still on the low side. Would expect more. How many times have you drawn them down below 50% DOD?
 
ld13 said:
Two batteries? Alarm batteries? Specs? AH ratings?
The 2400va mecer is 24V, so I assume you have two 12V batteries in series? 100AH?
300W load x 1.33 hours = 400WH adjusted to 470WH due to inefficiencies.... still on the low side. Would expect more. How many times have you drawn them down below 50% DOD?
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Don't think 70w due to inefficiencies, maybe 30
 
carnagelan said:
I have this Mecer 2400va, 1440w. My load is 299w. I have 2 brand new deep cycle batteries and after an hour and 20 minutes. The display goes to 50 percent. Is this correct? Do these inverters show correct battery life? I can't afford lithium at the moment so these have to do.
Click to expand...
the bad thing about soc is that even on lead acid soc is really not an accurate game by voltage
sure it is better than lithium but the same thing applies as sag makes the estimates difficult

the only way to know that you are really at 50soc is with a shunt

sure you can remove the load and then measure to voltage for a bit better estimate
 
ld13 said:
Two batteries? Alarm batteries? Specs? AH ratings?
The 2400va mecer is 24V, so I assume you have two 12V batteries in series? 100AH?
300W load x 1.33 hours = 400WH adjusted to 470WH due to inefficiencies.... still on the low side. Would expect more. How many times have you drawn them down below 50% DOD?
Click to expand...
They are 12v 100amp In series. I bought them 2 days ago. They have only had 2 hours of load shedding as I haven't been here for the rest. So the inverter is on but not online.
 
Lupus said:
Don't think 70w due to inefficiencies, maybe 30
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better brands i can imagine that low 30w for inverter itself
doubt a entry level device that the mecer is it would be below 70w
would love it if we can get a database of standby usage so others can know how much to compensate for their device
but not everybody has the tools to measure this ****
 
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