Battery Parallel connect only

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Wow, that all sounds really cool, and way above what I have the balls of knowhow for.

Fingers crossed it all goes well, I look forward to hearing all about it.

Thanks.
 
Hey guys,

Can I ask more of a personal question, a judgement really.

If you've read the previous messages you'll know the situation.

I'm torn now between taking a chance with the inverters I've got, and potentially having a system that works fine, or a system with limitations, or maybe an incompatible system, or returning the inverters I've got (for a 25% restocking fee, £650 ish) and getting the inverters that actually go with the batteries I've ordered, and having a system that works as it should. The inverters are about the same price, and very similar in spec and function, the main issue being the 100v start-up as apposed to the 75v of my current inverters.

So, what would you guys do? (Obviously I understand this is just opinion based)

Cheers.
 
So you'd just say stick with the order and see what happens?

I agree that the BMS will look after the batteries, so no real issue if the inverter can't chat to the batteries for the batteries sake, but what about the inverter sending my excess solar to the batteries to charge them, if I can't chat to them, it won't know they need charging will it?

Sorry, all this is winding me up now, as you say, why isn't there an international standard.
The inverter should control energy being fed into the batteries, no BMS is directly connected to any controls with regard to that. I've fitted inverters and batteries with BMS controls and wondered why you actually need the BMS as it would seem some inverters can be connected without one. However, being busy, I just buy a package and fit it rather than investigate every possible option. That way any compatibility issues are not mine and I can get technical support.
 
So if the BMS can't speak to the inverter, how does the inverter know to send/stop power to the batteries?

Tech support does sound like a good idea.
 
So if the BMS can't speak to the inverter, how does the inverter know to send/stop power to the batteries?

Tech support does sound like a good idea.
The charging method for LifeP04 is constant current to start with so for example 100A followed by a constant voltage mode when a pre determined point is reached. The inverter will know how cells are involved and what the charge current and voltages should be.
When the comms are working the inverter will also know the individual cell voltages and can react accordingly.
 
The inverter should control energy being fed into the batteries, no BMS is directly connected to any controls with regard to that.
It actually does, if the temperatures are too high / too low the charging current will be reduced, the BMS try's to keep the cells balanced, if one cell is going high or low it will communicate with the inverter and charging current will be reduced.
 
It actually does, if the temperatures are too high / too low the charging current will be reduced, the BMS try's to keep the cells balanced, if one cell is going high or low it will communicate with the inverter and charging current will be reduced.
Hi John, thanks for your usual very clear and concise answer, they are very much appreciated.

If my battery BMS doesn't speak FOXESS, like the supplier claims, then the inverter won't understand to turn off will it?
 
Hi John, thanks for your usual very clear and concise answer, they are very much appreciated.

If my battery BMS doesn't speak FOXESS, like the supplier claims, then the inverter won't understand to turn off will it?
No but the BMS should switch off the charging current.
 
Oh ok, so the BMS can just refuse current. Cool.

I'm really swinging backwards and forwards with this, I don't know whether to take a chance they will work with my current inverters, or take the £650 hit and get the compatible inverters.
 
I've bottled it and am going for the inverter that's compatible with the batteries, and take the £600 hit.

I'm thinking that if I have any issues, both companies will say it's cos I'm using non compatible stuff and refuse to help. So for the sake of £600 at least I get some peace of mind, hopefully.
 
I've bottled it and am going for the inverter that's compatible with the batteries, and take the £600 hit.

I'm thinking that if I have any issues, both companies will say it's cos I'm using non compatible stuff and refuse to help. So for the sake of £600 at least I get some peace of mind, hopefully.
You can sleep easy now then, well done, it will all nail together smoothly.
 
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