Recent content by Swing

Yes 30kWh (rough estimation) is significant. But it might also be the case that I start using them and quite a lot of them die and it turns out to be more work. I guess I need some kind of single cell tester that is either quick (higher Amps) or cheap (to do more parallel) And I still would...

Ah reviving this old topic. For now I have chosen to work with Victron. They can work with any solar inverter, and it really is a mixed bag of inverters. So no use in vendor locked-in solution.

I have almost 200 Winston Thundersky cells of 60Ah , about 9 years old. I think there is still for 80% capacity in them, so at least 30kWh to be used. However, some cells are probably not that healthy and will die quickly. They were never paralleled. What are acceptable internal resistance...

I wouldn't expect to see imbalance quickly, only after a while. Anyway, I would just put active balancers on the battery and simplify the whole setup. That will save you lots of time. Anytime when the battery is going low or high, the active balancers will kick in.

Well, you can configure the BMS can't you? So make the balancing start at 3.4v or 3.35 or something, and lower the float voltage. I think the float voltage is high if it is going to run like that, floating for complete summers. But it will still work. Your use case is of course not as intended...

I see the data sheets of the Deye hybrid inverters, looking at the high voltage versions, I cannot really get what the charging power is from AC (grid) to DC. There is a DC max charge amps, but the voltage can differ greatly, making it exceed the rated power of the unit. I would like to buy a...

I cannot comment on your exact setup or issue, but in general, yes inverters can defenitely go in discharge mode when the actual system voltage exceeds the configured max battery voltage. I had similair behavior with Victron and the Multiplus settings. You force the top-off with your other...

Well because of that last part I think it is good to never fully charged the battery. For now the next project is just a combination of a few small houses with existing PV, doing peakshaving. Nothing special in terms of surges. However, I will eventually run into more business use with more...

@MisterB1959 Yes it is about not pulling new wires. Especially because distances become bigger and so on. Yes adding any kind of inverter in an AC coupled manner like you mention with SunSynk and tell it to keep the grid at zero or whatever, will work to some extent. But it is different from an...

Well the great thing about Victron is I know how to work with them. So it is not only about quality but also about support, and not spending a lot of hours that was a bit cheaper to buy. I will look into SMA a bit more now. I actually would like to go to high voltage but only in freedom of...

Thanks I will check them out. I should have written I am looking at this from a European perspective with EU grid code, meaning that all existing grid-tied PV inverters should indeed be able to work with frequency shifting. Projects usually consist of peak shaving and/or self consumption, but...

I am finding it hard to google this, as you get so many irrelevant hits. This thread is specifically for AC coupling of Solar on the load output of the inverter Yes I prefer DC coupling too, and yes I know there are lots of inverters that let you couple AC solar on the Generator port (such as...

@Plum Crazy Rob You mean you have the EG4 hybrid which looks like the Deye 48v inverter in terms of specs? How noisy is it on the inside and outside?

-5 or -10C is rare in these days but happens at least once a winter. Typically more like 0 to 10C I have been working with mini-splits which still provide a reasonable COP in those temperatures and typically keep working until -15C. The Hotspot also works until -15C I have read, but I would...

You have different experience? With this Hotspot or other 48v DC minisplits? I am sure you can hear it, but the question is if it is acceptable or not