Bluetooth app showing more than one 100 20 MPPT

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markaos asked Jul 14, '22

Bluetooth app showing more than one 100 20 MPPT

Image Caption

Im having multiple problems with this installation.

330w monocrystaline panel

100/20 mppt

12/250 inverter

2x Bluetooth dongles

3x 12v 110ah carbon gel batteries.

To power 39w diaphragm air pump & 45w pond pump.

Bluetooth is showing 2 MPPT's There's only one in installation with a 12/250 inverter.

PV Voltage reads 12.39 at terminals but reads 36v when disconnected from mppt & directly to multimeter.

Batteries read 12.57 from MPPT battery terminal.

I understand batteries won't charge unless pv Voltage is more than batteries but I can't understand the drop once connected to MPPT.

Please help

Thanks in advance.

MPPT Controllers

screenshot-20220714-131935.jpg (183.6 KiB)

screenshot-20220714-132235.jpg (280.2 KiB)

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Matthias Lange - DE answered · Jul 14, 2022 at 06:19 PM

You connected a Bluetooth dongle to a Smart MPPT that already have a Bluetooth module build-in. Because of that you see it twice.

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markaos commented · Jul 14, 2022 at 07:45 PM

Im sure there are 100/20 with built in Bluetooth & 100/20 that require a dongle.

I will measure tomorrow in full sun.

The cable run from panel to MPPT Is exactly 5 meters.

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markaos markaos commented · Jul 16, 2022 at 05:44 AM

I didn't get there in time for full sun but to my surprise the system was working with only the diaphragm air pump connected.

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markaos commented · Jul 19, 2022 at 02:28 PM

I've now obtained inverting remote cable to go between MPPT & 12/250 Inverter with inverter powered directly from batteries. I need to come back tonight to double check the remote cable functions and switches inverter off at 12.62v. Fist time in float for a while.Image Caption

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markaos answered · Jul 16, 2022 at 10:47 AM

Hello Kev.

I am worrying that the panel I bought is not as good quality as I thought. ja solar jam60s17-325/mr.

Ive got three of these batteries;

https://www.ebay.co.uk/itm/175340322753?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=u8yf6H81TPi&sssrc=2349624&ssuid=vB-17T8HRuS&widget_ver=artemis&media=COP

In answer to your question, It no longer showed two MPPT'S in the device list.

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kevgermany ♦♦ commented · Jul 16, 2022 at 12:46 PM

Solar output is very variable, depending on weather. I see your peak power hit 274W, not that bad. This will not only depend on the amount of light, but also the load and ability of the batteries to take charge. Battery voltage isn't getting to where it should be, this will lead to damage and short battery life. It would be worth doing some digging to find out why.

Assuming you run the two pumps all day, total power used is about 2kWh. You're generating nowhere near that on the good days.

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Modifications Space

Node Red Space

Answer 1 · 2022-07-14T18:09:46Z

Mike Dorsett answered · Jul 14, 2022 at 06:09 PM

For the PV voltage, disconnect the module from the MPPT controller. You have measured the open circuit voltage at 36V, now short the two wires from the module together (DO NOT DO this with it connected to the MPPT) and measure the short circuit current. If this is low, then you have a high resistance point in your PV wiring which needs correcting. Once you have done this, you should have charging - be sure to edit the MPPT settings for the battery voltages.

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Answer 2 · 2022-07-16T05:45:34Z

markaos answered · Jul 16, 2022 at 05:45 AM

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Answer 3 · 2022-07-16T05:46:05Z

markaos answered · Jul 16, 2022 at 05:46 AM

Image Caption

screenshot-20220715-173451.jpg (363.6 KiB)

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Answer 4 · 2022-07-16T05:47:13Z

markaos answered · Jul 16, 2022 at 05:47 AM

Im based in Southend on sea which is South east England.

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Answer 5 · 2022-07-16T06:30:37Z

kevgermany answered · Jul 16, 2022 at 06:30 AM

Looking at your numbers, the diaphragm pump on its own is pulling more than the panel is generating.

You might be undersized on panels, unless you're expecting the multiplus to supplement.

Did you check the double Bluetooth as suggested by @Matthias Lange - DE , Smart Solar MPPT has the built in Bluetooth, Blue Solar does not.

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Answer 6 · 2022-07-16T14:08:17Z

markaos answered · Jul 16, 2022 at 02:08 PM

Yes you're totally right It was an oversight of mine, I need another panel.

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Answer 7 · 2022-07-17T07:58:12Z

markaos answered · Jul 17, 2022 at 07:58 AM

Thank you for your comments. I visited again last night at 0100 in the morning and diaphragm pump was still running so batteries are charging but all that time is in BULK.(see attachment)Screenshot_20220717-002429.jpg

Couple more questions;

Has anyone any success in supplementing PV power using a wind turbine & 2nd MPPT.

& will a BMS or other device boost the effectiveness of charging.

I ask because Im limited to space for additional solar panels - I have a telegraph pole mounted vertically with a unistrut top collar and gate pin hinges down to solar panel unistrut frame that kicks out from telegraph pole with two unistrut braces of 1500mm to give panel 45⁰ angle.

screenshot-20220717-002429.jpg (277.6 KiB)

screenshot-20220717-002238.jpg (207.8 KiB)

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