SolaX Triple Power Battery Balancing

There appears to be a lack of information available on how to properly balance SolaX batteries. Here are the steps:

1. Force discharge the batteries down to 10%.
2. Shut down the master battery and disconnect the slave battery.
3. Short the master battery, then reconnect it to the inverter and power it back on. You should see a state of charge (SOC) on the inverter that is significantly higher than 10%.
4. Discharge the master battery down to 10%.
5. Once complete, reconnect the slave battery and return the system to normal operation.

At this stage, both batteries should be at the same SOC (10%).

However, there is one issue: the master battery will not operate without at least one slave. So, how does one balance the master and slave when only two batteries are available?

Not familiar with these batteries, but I would be rather surprised if the master cannot work alone.

binky said:

Not familiar with these batteries, but I would be rather surprised if the master cannot work alone.

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Question is what does it mean: short the master battery?

spacemoc said:

Question is what does it mean: short the master battery?

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I very much doubt it means what it says! Looks like a typo or mistranslation to me.

spacemoc said:

Question is what does it mean: short the master battery?

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Shorting any battery is dangerous, so I'm not sure. It may well be worth a look for a YouTube video on how to do what you want to do.

I think your battery can be set for forced charge via the app, so basically it fully charged them from the grid, which is another way of balancing them out that I have used on other batteries.

Here's one video

binky said:

Shorting any battery is dangerous, so I'm not sure. It may well be worth a look for a YouTube video on how to do what you want to do.

I think your battery can be set for forced charge via the app, so basically it fully charged them from the grid, which is another way of balancing them out that I have used on other batteries.

Click to expand...

Batteries are being fully charged every night and both charge to 100% but one set of batteries charging much shorter then the other…. Balancing video below doesn’t show anything

binky said:

Here's one video

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This video doesn’t show anything at all I know this video

spacemoc said:

There appears to be a lack of information available on how to properly balance SolaX batteries. Here are the steps:

1. Force discharge the batteries down to 10%.
2. Shut down the master battery and disconnect the slave battery.
3. Short the master battery, then reconnect it to the inverter and power it back on. You should see a state of charge (SOC) on the inverter that is significantly higher than 10%.
4. Discharge the master battery down to 10%.
5. Once complete, reconnect the slave battery and return the system to normal operation.

At this stage, both batteries should be at the same SOC (10%).

However, there is one issue: the master battery will not operate without at least one slave. So, how does one balance the master and slave when only two batteries are available?

Click to expand...

I assume you have a string of batteries and they are not all at the same charge level, maybe you added a new one to an existing set and they where not charged to the same level. The documentation I think says how to add a new battery to an existing set, viz charge/ discharge the existing set to a standard level, then add the new battery which will be supplied as new charged to that level ( cant remember what that level is but should be in the documentation.)
if you have a set that seems to have some batteries charged to different levels, it becomes more involved: I have used a seperate DC power supply to charge each battery offline to the same voltage say 118v-120v or whatever the highest one is at (they need to be all at the same temperature). Easy enough for the slaves (with the correct connector leads) the master is more involved as the raw battery terminals are not available offline, only via switched contactor inside.
You can deduce its voltage by connecting master plus one slave and switching the inverter on, you can then measure the sum of the two, then subtract the slave voltage which you can measure. I think it is just possible to get to the raw battery terminals by taking the top cover off, but try to avoid that, there be dragons here! It goes without saying there are lethal voltages and currents involved doing all this. Do not attempt unless you really know how to do it safely.
There might be other ways, otherwise batteries should eventually auto balance after several full cycles, but could take a few weeks of daily cycles. A hint that some batteries are not at the same level is if the inverter battery level log suddenly drops sharply from a sensible level to minimum on discharge, the bms has just realised that one battery is at minimum, even though the sum would indicate not empty.