No solar-charging

Question

question

garry13 asked May 2, '23

No solar-charging

My system is installed in a Camper: 4 solarpanels, each 140Wp, one SmartSolar MPPT 150|35 , two SmartLithium 12v|200A batteries, one BMV 712 smart, one Blue Smart IP22 30A charger. One D+-relay connects/disconnects the motor-battery from the Lithium-batteries.

When the engine is running or by using the 220V-Charger, everything works fine: the batteries will be charged.

But as soon as the solarpanels should do the job (the sun is shining) I get something like this:

These are the settings.

The "charge"-led an the BMS 12V | 200A is off. Charging seems to be blocked:

I checked the shortcut of the green plug (remote for charging): OK, the red cable has 12V.

I checked the cables between the solarpanels - no findings. Connecting the panels to an outside-solar-controller showed normal working:

Connecting other, outside panels to the system: no charging:

Honestly I am running out of possible solutions. Any ideas will be apprechiated !!

Gerhard

battery charging

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klim8skeptic ♦ commented · May 02, 2023 at 09:54 AM

@garry13 it looks like the fuse / breaker between the mppt and battery is faulty.

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garry13 klim8skeptic ♦ commented · May 02, 2023 at 10:02 AM

Thanks for Your comment !

Where is this fuse ?

I can measure the normal battery voltage here:

Could this be the case, if a fuse between the mppt and the battery would be faulty??

Best wishes

Gerhard

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Matthias Lange - DE ♦ garry13 commented · May 02, 2023 at 10:09 AM

There is no fuse at the MPPT, but there should be a fuse somewhere between the MPPT and the battery.

Please make a screenshot of the history tab of the MPPT (Verlauf).

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garry13 Matthias Lange - DE ♦ commented · May 02, 2023 at 10:39 AM

Thanks for Your comment !

The last days there was not so much sun around and the 220V charger was working:

But 3 weeks ago on sunny days without 220V charger it looks like that:

The maximum was 41W from 540Wp solar panels. I think, this is not normal...

Best wishes

Gerhard

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klim8skeptic ♦ garry13 commented · May 02, 2023 at 10:24 AM

@garry13 I can measure the normal battery voltage here:

Not according to your overview screenshot. Batteries and shunt show 13.2xv, the mppt shows 13.49v (Or 14.19v).

Describe the devices between the mppt and battery.

How exactly does the BMS allow the 150-35 to charge?

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garry13 klim8skeptic ♦ commented · May 02, 2023 at 11:13 AM

"Describe the devices between the mppt and battery.":

Between mppt and battery there is "only" the BMS and what is connected there is a lot: except the EBL and a fuel-cell (but not producing, only monitoring), other power consuming items like the parking heater, a power inverter to 220V, electric door, dry toilet (shrink and wrap), the ip22-charger, one connector of den D+-Relay. That should be all.

"Batteries and shunt show 13.2xv, the mppt shows 13.49v (Or 14.19v). "

If I disconnect the mppt from the solar-panels, the battery-voltage, measured at the mppt is the same, as at the battery itself. So I think the higher voltage is caused by the mppt - it tries to charge.

"How exactly does the BMS allow the 150-35 to charge?"

It is not a smart-BMS. So I can only see the charging conditions in BMV-712smart (I think, it is like this: if the voltage is 14 V - the battery if fully loaded - otherwise not)

Here is the setting of the mppt:

The "expert-mode" is off.

Hope this helps :-)

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