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Hi, I got YR1030+. I put 2 EVE 280ah cells in series and measured the resistance. it came 0.6 mOhm it is made of (0.2 cell1+ 0.2 cell2) which means the busbar connection is the rest (0.2) = 0.6 I want to calculate the power loss for 100A: V(drop) = 0.0006 (R) * 100 (I) = 0.06volt Power...

Hi, I am pulling max 99A from the 24v 280Ah battery over 40-50cm . These cables says they can do that at 16mm2. Can I trust that? I tried different online calculators with different results. https://www.aliexpress.com/item/1005004218007062.html

I have noticed that some cells are running out of charger faster than others, I thought it could be a difference in internal resistance. But when I touched the busbars some were clearly hotter than others, then I tighten the screws more, when produced less heat on those hot basbar ( I know hand...

Hi, Like if the new grade A EVE 280ah cell cost 175usd. How much EVE is selling the grade B cells to the alibaba resellers? I heard that they group buy together from EVE. But how much % of produce cells matches the A grade specs and how many end up as B. And for how much those Bs gets sold...

Or does it always try to satisfy the local demand of appliances before exporting anything back to the grid?

I have AC-DC charger for LFP rated voltage 3.65v but it seems that the cell stops sucking amps at 3.45 and the charger turns the light that it is full. But the voltage is not 3.65v does that mean the cell is damaged?

The solar array is connected to an on-grid inverter that has MPPT inside of it. Now if add in my LFP battery (dont worry about BMS and any other protection) it will set the DC line voltage to the battery voltage, correct? if the panels can produce a higher voltage than the battery voltage, then...

I see that battery must be connected first and then the solar panels. But what would happen if someone by mistake disconnected the battery while the solar is plugged in? any irreversible damage?

I want to cut off power between 12v battery and epever SCC 30A. using this https://www.aliexpress.com/item/1005001694446039.html or is it better to have something like this: https://www.aliexpress.com/item/1005002377029607.html

I got working once and now with another one of same unit xtra 30A it is not. What can I check or do? if you can see picture attached. it says -6 degrees and the batt light is still green and charging from panels.

I hear liquid gargling noise when tilting the cell. is this normal???

I see that most posts talk about tracer and I have got xtra model. It says in the manual that Lifepo4 is supported when you select Sealed as I understood. Here is attached snapshot of the manual. Here is link to the manual: https://www.epsolarpv.com/upload/file/1811/XTRA-SMS-EL-V1.3.pdf...

Hi, I want to make sure that I am not exceeding the C rating of my lifepo4 20AH batteries. I have 4S config and the inverter was pulling 40A . does that mean it is 10A per cell which is 0.5C in my case?

Hi, This vendor Shenzhen Luyuan Technology Is saying that they are ordering new true grade A 280ah directly from EVE for 118usd/pcs. They also sell grade B 280ah for around 84usd/pcs Anyone has ordered those 118usd? how can we tell if they are truly grade A if grade B is also pulling full...

Xuba has been avoiding and ignoring my questions about the VAT amount that I pay through them. Is there any seller that ships DAP so I could handle the customs and VAT myself?

The internet is full of this statement and example (also in Will videos): "Watt is instantaneous power. 1000W load running for one hour is 1kWh. " So that means if all your loads sum up to 1000W then you need at least 1000W inverter. All of this does not make sense to me. If a device has rating...

Hi, I am at 60 degrees altitude. I have checked that sun elevation during summer is around 40-50 degrees. So I thought if I want to have some days with 90degree angle between sun rays and my panels then I have to tilt them 40 degrees. I got this by ( 180 minus sun angle 50, minus 90 to be...

Hi, I have ordered 4 panels each are 60cells 1.5*1 meters. Together with around 50Kg of batteries and MPPT chargers. Unfortunately, they have put the heavy box on top of the middle of the solar panels and they have travelled over many countries via sea and road. So that 50Kg have been bouncing...

Hi! I am happy that I have joined the forum, I have been reading around and posted few questions. Very nice and friendly people! I am building my own off-grid cottage. I have good software background and I am planning to develop my own BMS ( I will happily share it when it is working) I have...

Hi, I would like to simulate a 60cells panel. I have found "PROGRAMMABLE POWER SUPPLY 0-60V/0-3A 180W " for 200usd. Can I simply plug it to the MPPT SCC if it is within the voltage specs?

Hi, Is it possible? Both MPPTs are connected to the same 24v battery. I assume that the DC output is 24v too. I would like to connected the DC outputs from the MPPT together in series to get 48v wires to hook up a water heater element. I am not taking it directly from the battery because 24v...