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damocampo asked

Multiplus and solar not charging

Hi folks. I have a Multiplus 120v, 150/70 MPPT x 2, 1500w solar in series, 30/30 DC-DC, shunt and Cerbo GX. I am plugged in about half time so I do so to recharge, the batteries and myself. When I run my lithium (600ah) down to say 10% and plug in, the mains and solar don't fully charge. It shows that it is equalized based on my plug in AC load as well as my 12v DC load. Takes forever for my batteries to recharge and seem to never get back to 100%. Currently at 85% after a weeks time. I am plugged into 30A shore using 1700 watts during the day on average with my Multiplus also set to 30 amps. Why wont the excess watts up to 30 amps charge my batter, or my MPPT's. Any help appreciated. Thanks

Multiplus-IIMPPT Controllersbattery chargingsmart solar charging behaviour
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snoobler avatar image snoobler commented ·

It's a little hard to follow you. Step 1 is to confirm that ALL connections are properly torqued, and that nothing between the charger and batteries is generating heat. Cable/terminal crimps should be high quality.


What do you mean by "equalized"?


What is the absorption voltage on your:

Multiplus:

MPPT1:

MPPT2:


Is this a DIY battery? If so, does it have a smart BMS that reports cell voltages?


Are you 100% certain that the BMS isn't stopping the charge?

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2 Answers
damocampo avatar image
damocampo answered ·

Hi @snoobler. All cables, lugs and torques are good and produce no heat. The batteries are factory made with internal BMS with no app connectivity.

Here is the status as of this morning. What I mean by equalized is the incoming demand is equal to or close to the load. 873w in 872w load. The excess is not charging yet the MPPT is charging but never fully.

1691591595931.png

Here is my Multiplus

1691591790441.png

One MPPT

1691591850466.png

And the other

1691591900902.png


1691591595931.png (108.1 KiB)
1691591790441.png (43.3 KiB)
1691591850466.png (44.1 KiB)
1691591900902.png (40.5 KiB)
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derrick thomas answered ·

Turn off storage mode in veconfigure and see what happens. Also while in there check and make sure you have the maximum setting for battery charging.

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