Battery SOC RECALIBRATION GUIDE – Need help understanding please. – Batteries

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Joel Brodeur

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April 8, 2025 10:31 pm

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I found the following document on the EG4 website under the batteries:

EG4-Indoor-All-Weather-280Ah-Battery-Recalibration-Guide.pdf

I have a couple of questions about the guide and its application.

1 - The guide indicates performing the recalibration monthly, how critical is that?

2 - Is there any way to perform this using just the inverter (preferably using closed loop and not Lead Acid settings) and batteries instead of a battery charger and 48V load?

My system:
6000XP in closed loop
2 X indoor Wallmount batteries
18 X 410W Panels (2 array of 9 each)

Sometimes the easiest solution is the best solution.
Sometimes not.

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Eric

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April 10, 2025 8:27 pm

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Joel Brodeur

1 - The guide indicates performing the recalibration monthly, how critical is that?

I would say it is highly recommended. This will help prevent imbalance issues, promote proper cell balancing, and recalibrate the SOC.

2 - Is there any way to perform this using just the inverter (preferably using closed loop and not Lead Acid settings) and batteries instead of a battery charger and 48V load?

Unfortunately, the only way would be with a charger or placing the inverter on lead-acid mode.

Joel Brodeur

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April 10, 2025 8:42 pm

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Eric

@eric thanks for the reply. I guess I have what is probably silly follow up questions that you might be able to answer:

Could I do the following:

1 - Shutdown my solar panels to discharge my batteries (I have no commercial power just solar and generator)

2 - Set my gen start SOC to 1%

3 - Set my gen end SOC to 101% (I thought I saw that mention on one of the posts here)

Let the gen start - it should be mighty close to the low voltage alarm

When the batteries reach overvoltage alarm occurs shut down the gen

I am guessing that this won't work with both batteries connected as they would charge and discharge at different rates? Or would the alarms protect each battery individually?

Or am I just being stooopid? 🙂

Sometimes the easiest solution is the best solution.
Sometimes not.

Eric

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April 11, 2025 8:23 pm

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Joel Brodeur

@joel-brodeur I am not sure if this would work. I don't think this exact scenario has been tested.

Joel Brodeur

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April 11, 2025 8:34 pm

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Eric

@eric Bummer. Think you might ask the testing folks to maybe try it out?? 🙂

Sometimes the easiest solution is the best solution.
Sometimes not.

Eric

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April 11, 2025 8:50 pm

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Joel Brodeur

@joel-brodeur
Not sure how busy they are, but I can definitely put in a request to test this.

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dfwtinker

April 9, 2025 12:11 am

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Monthly does seem a bit excessive! and the equipment might be pricy for quality stuff.

I agree, there must be an easier way.

The answer should be interesting indeed!

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Ron

April 9, 2025 11:16 am

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Installed transfer switch before chargeverter to utilize grid or generator and set to 57v.

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Diver Dave

April 15, 2025 1:43 am

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Off-Grid UPS - Powered by EG4 Cabinet w/ 3 EG4 LL 25.6v 200Ah Batteries

I have been running my system continuously for 3~4 months on solar & batteries.

I'm tracking cell voltages, all are spot on, the pulsing for Run, is not the same.

In the software BMS Tools, can SOC be set to cell average?

That might be how to get all the battery LEDs to show the same charge state.

Question Battery SOC RECALIBRATION GUIDE - Need help understanding please.

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