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The Goodwe BP DC connect charger is working really well. Its been running a few days after support identified that the burn in test switch (memory setting) had not been turned off after leaving the factory. Since the fix,its been filling in when the sun does not shine. It runs the air con at...

Its been awhile. Been working with Goodwe in relation to an issue with my Goodwe BPDC connected battery storage. Last night was the first time it ran without issue. The problemwas resolved with a hardware registry change. Hopefully I will get the full break down today on what caused the issue. I...

Good work Chickey (Col), I have refined the design,as I found an internal divideralready designed into the ESP, so just needed to work with it it rather than recreate it. The new circuit is simpler: You can check the rest of the design from here...

Thanks guys for the info on the Opus charger. And the issue with the methods of testing chargecapacity and the potential for error. As an update, I had some issues with the Goodwe BP charger, where the unit would keep resetting every few minutes,interrupting the charge and discharge operation...

Where are on track and almost done. The GoodWe inverter is now connected to the mains power to measure import and export power. The last of the battery packs have been soldered. Now waiting on some heat shrink and eye lugs from China...next weekas a guess, then its go live :) Was going to...

I have beenworking on a ESP based BMS circuit. Essentially each battery pack will have an ESP such as a ESP8266 connected to the dump board. The board provided a dump circuit,voltage sampling and LED when dumping. It is designed to be off when ESP shutdown/sleeping due to low voltage. Ill use...

Thanks for that, I'll redo the divider. Will also add a LED.

I have been sniffing around for designs. For me, I'm goingwithsomething like this. An ESP per battery pack. The circuit provides a 1.2W dump, and voltage sensor. If I want to add temp ill go with a Dallas 1-wire and which can be hooked directly to the MCU with a 4.7k pull up. To your...

With a mosfet you need the gate voltage to be1-2v +/-difference from the source depending on the depletion type to turn the FET on. So unless you switching batteries in and out of circuit, the ground with respect to your driving circuit becomes an issue. So say a4 battery pack will have a...

I bought a cheap (35$) 80w chines soldering iron, and its plenty hot enough..adjustable on the handle to 500c

Yeah, for each battery pack you could have a 1-wire 2405, (opto isolated)Mosfet and temp probe (DS18B20), with another wire to measure voltage. It wouldbe nice to have an isolated voltage sensor on a 1-wire....so only a single pair string across all cellsexpandable. With theESP32 proving the...

Hi, looking at your idea on ESP32 as a BMS. Looking at doing the same, not started, just kicking around some numbers. Would be great to collaborate. Was looking at using python and clustering them...all independent. I was going to use a mosfet which would dump around ~<400ma for balance, a...

An update: 1. GoodWe battery Inverter is installed, save the mains current sensor. 2. Battery packs half done. I have had some issues with the GoodWe BPsoftware. It seems the templates for the battery setup requires a cold reboot. With the bestoption to selectLead-Acid, as the Lithium and...

wow, novel idea, with super thin panels. How are you managing up draft on the panels if it gets windy? I know it less of an issue on pitched roofs, scallion, but could be an issue?

Very nice....its massive.

Good points, however the batteries that I purchased werestraight from the manufacture, and advertised as 2400mah. So from what you are saying,what I got was spot on what I paid for. Cheers Battery Management. I'm current building the battery pack, and soon will be done and ready to hook the...

Good pick, the other side has only 1. The side you are seeing is the first cut. May go back, but if the other side has one, will just leave. You are right, it is a heatpump hot water system..draws 1.2kw max for around 3-4 hours...super efficient (COP 4.5). It sits on the same electrical tariff...

A little bit of a pause as I waited for a 80wsoldering iron, MC4 puller, switch board and flux pens. I have mounted the GoodWe charger, and installed the switch board for the energy flow meter. I have anissuewith installing the current sensor to the mains inlet, as space is limited... and...

A friend has designed and built a BMS for a car. I believe it can be simply modified for what we are looking for. See below for details. Packaged up my source files and put it on Sourceforge: https://sourceforge.net/projects/low-cost-bms/ You can also read all about it on our forum here...

Looks like I've bought a Goodwe BP. Ideally I wanted AC coupled battery, so I could move the batteries into the carport. But seems the market is not that matured..I am sure it will be soon. Enphase and Selctronics ($6k cough) seems to be the only close match...