Easysolar 48-3000 and BSL Batteries error/alarm

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Herve RV Nizard asked Apr 9, '24

Easysolar 48-3000 and BSL Batteries error/alarm

Image CaptionGood day to all .

I need help with a very strange problem when trying to connect an Easysolar 48/3000/35 with a BSL 48-200PW .

I am a Victron , Pylontech and BSL distributor and installer , so very familiar with Victron / BSL integration . Did many of these .

The funny part is that this one is at my home !

I have an Easysolar 48/3000/35 - 240v (The old one, with the color control and the AC breakers at the bottom - See picture), since a few years . Had 4 batteries AGM 12v/200Ah and they are becoming old . Decided to replace these by one BSL 48-200 Powerwall .

Each time I try to connect the battery to the inverter, the battery goes on alarm mode and shuts down .

Please note :

- I first updated all the firmwares

- The BSL was installed at our lab with a Multiplus II 48-5000

- When I tried to connect and got the alarm , I tried many things .

- I brought a Cerbo and connected to the BSL . Works fine . I can see the BSL on the device list

- I added a MPPT 150/60 with a few panels to check charge . Charging perfectly .

- Today , I connected a separate Multiplus II 48/3000 . All fine and all working well together .

As soon as I try to connect the BSL to my easysolar, ... ALARM

- I first disconnected my color control, and wired it alone to the BSL (After having changed the settings) . All fine and BSL appears as normal on the device list .

I was thinking the problem could come from residual "inside connections/current " from the ancilary elements of the Easysolar , so

- I disconnected the integrated 150/70 and the color control

- I even disconnected the AC IN and AC out wiring

Same problem

I am a bit lost . Hope someone on this forum has already faced a similar situation and may have found the solution !

Thanks in advance .

EasySolar All-in-One bslbatt

easysolar-48-3000-35.jpeg (324.7 KiB)

bsl-10kwh-powerwall.jpg (3.3 KiB)

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Alexandra ♦ commented · Apr 09 at 06:17 AM

@Herve RV Nizard

What is the alarm?

Did you try power on with a pre charge resistor?

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Answer 1 · 2024-04-09T10:28:57Z

Herve RV Nizard answered · Apr 09 at 10:28 AM

Good morning Alexandra. No I did not . I will try but it's a 10 kwh lfp battery for a 3 kva inverter.

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Alexandra ♦ commented · Apr 09 at 01:21 PM

Yeah unfortunately with a BMS capacity doesn't really mean thing. It is the inrush it allows. Or is capable of.

I am underwhelmed by the precharge of BSL. Surprised you haven't had an issue up to now.

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Answer 2 · 2024-04-09T12:07:34Z

nickdb answered · Apr 09 at 12:07 PM

The powerwall's performance is a bit light in the pants, 100A continuous (check what DCL it is sending) for a 10kWh battery is a bit poor. Their generic BMS is also not the greatest.

So, it is probably freaking out by not precharging the inverter.

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Herve RV Nizard commented · Apr 10 at 12:30 AM

Well, that's 2 person now, with @Alexandra leading me in the same direction. And as I never had this problem before, it's new to me. I now need to figure out how to pre charge the easysolar ?

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Answer 3 · 2024-04-10T00:27:36Z

Herve RV Nizard answered · Apr 10 at 12:27 AM

Humm, interesting. I have installed 8 systems with bsl . Mostly with multiplus II 48/ 5000, 8000, and 10000. Not yet had this problem. But I am interested to learn how do you pre charge them ? And thanks again .

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Alexandra ♦ commented · Apr 10 at 04:18 AM

We have a precharge resistor in the install kit. Use it for a few brands of battery. So e like the FW eTowers in the instructions say to use one to limit the inrush.

Nick has a trick, he uses the mppts to charge the caps up.

The only brand I know that has a really elegant precharge is BYD. I love it.

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Fideri commented · Apr 10 at 09:39 AM

@Herve RV Nizard

I used @nickdb's pre-charge trick with BSLs successfully.

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Answer 4 · 2024-04-10T18:43:04Z

Herve RV Nizard answered · Apr 10 at 06:43 PM

Ok thanks a lot . I now need to understand "nickdb"s" trick haha

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Answer 5 · 2024-04-10T18:59:49Z

Herve RV Nizard answered · Apr 10 at 06:59 PM

@Alexandra @Fideri . IS it simply that you leave the panels connected to the MPPT when connecting the MPPT to the bus bar ? so that would give some power to the inverter before connecting inverter to batteries .

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Alexandra ♦ commented · Apr 10 at 07:05 PM

I am not a fan. But by switching at the DC disconnect, the panels to the mppt it powers on and precharges the DC bus.

There are a few cautionary items though. If you have made a wiring mistake..... Reverse polarity on the battery, you will have a disaster. And no coverage by warranty.

And you have to make sure the mppt has detected system voltage ok. And do the right settings.

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Answer 6 · 2024-04-10T21:49:54Z

Herve RV Nizard answered · Apr 10 at 09:49 PM

A million thanks to @Alexandra and @nickdb and @Fideri . Did the @nickdb trick and all worked perfectly . You are the best.

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