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diy solar

diy solar

“Inverter Only” solar system??

Well, yep, that’s pretty much what I wanted to do. Company quoted a 3kW array with no battery for about ¥1.3M and with a battery for ¥3.3M. I ask about them adding the cables to the battery and I’ll add the battery later. Apparently the no-battery system meant a no-battery inverter. So I asked about adding the inverter from the with-battery system. Sure, but that’s an extra ¥100K. And, oh, no guarantee on system performance with user supplied battery.

What could be ‘special’ about their inverter, or their battery?
ya gotta find out who makes it...
 
So EneTelus isn’t the manufacturer??
I did not know but i came up with this.. it appears they have a english language page...


i would contact them strictly in english and tell them you are interested in possibly importing their products in the US and ask them about the battery protocols and things of that nature... you might be surprised at what they tell you.

oh, use a VPN to give yourself a US IP and email address. make up a temp email address with a fictional company name, tell them you are a new company looking for products to sell in the US... get the data and run.
 
What could be ‘special’ about their inverter, or their battery?
Some inverters will only function with a battery that has the correct data communication. There are many different protocols used in all the different BMS units. Some inverters might let you choose from some of them while others will only use their own battery BMS. Some DIY people have snooped on the data streams and then programmed converters to read different battery BMS units and translate the data to what the inverter needs. But for this to work, you still need to know exactly what the inverter is asking for. Having the BMS data can make things work very smooth but many times, they throw in data that is only there to make it so only their battery will work. They claim it is all about safety, but that is not true. But it is also fair for them to only warranty the system if you are using all their components. If the data from the battery is wrong and it causes a failure, they won't be responsible.

Many inverters will allow a "User" or even a "Lead Acid" mode which does not need any data and may allow the parameters to be adjusted. Then you need to manually set the voltage, current, and time settings. My system is running with no data connection. Each of the three battery strings has it's own BMS. If anything in any battery string goes out of spec, all it can do is disconnect that battery string. And my system will not report that this is happening either. I could be down one or two battery strings and not even know it. But I do check in on my system at least a few times every week. If the battery voltage is changing faster than normal, I have yo go check the batteries. Only one of them has a blue tooth BMS I can check. The other ones, I have to go in with my meter to see why it is offline. So there are some good reasons to have the data connection, but as long as you know the issues and are willing to deal with them, it's not strictly required. But this all still requires an inverter that allows you to run it this way.
 

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