Solar panels and battery - any real world reccomendations?

[reef]

it’s no different to your battery though, it’s all about the C rate at a specific temperature. If you apply the same C rate to a tiny battery, it will not take much power.



Gen1 5.2 maxes out at 0.5C (2.5kw), it then drops to 0.33c (1.8kw) below 20C.

I’m pretty sure it will drop to 0.25C and then down to nothing at 0C cell temperature.

It’s definitely a gen 1 product that’s for sure.

Yes, my 14.7kWh is actually 6 modules in series, so with just two batteries (4.9kWh), then that 10A below 10C would be around 1.2kW charge rate. It was part of the advantage of this model at the time that you could increase the charging speed with more modules, as many batteries back then were stuck with low charge/discharge rates. Things have moved on since though.

 

[DarkBahamut]

One thing that suprises me is how many batteries seemingly apply rigid rules to charge limits and temperature. On our Growatt system temperature based charge limits also depends on the SoC. At low SoC, there's no charge limit at all until <10 C, and even then it will still charge at 4.8 kW (0.33 C) down to 5C. At higher SoC the charge limits are more agressive, with a 3.3 kW at <15C if SoC is also >70%. The real benefit here is when the bettery is cold in winter, you almost always commence charging with a nearly depleted battery, and by the time SoC climbs the battery has warmed itself up by charging anyway.

 

[BUDFORCE]

One thing that suprises me is how many batteries seemingly apply rigid rules to charge limits and temperature. On our Growatt system temperature based charge limits also depends on the SoC. At low SoC, there's no charge limit at all until <10 C, and even then it will still charge at 4.8 kW (0.33 C) down to 5C. At higher SoC the charge limits are more agressive, with a 3.3 kW at <15C if SoC is also >70%. The real benefit here is when the bettery is cold in winter, you almost always commence charging with a nearly depleted battery, and by the time SoC climbs the battery has warmed itself up by charging anyway.

Father in law has a growatt setup it seems much better than my givenergy stuff.

 

[lmfy2k]

Should you limit the amount of panels and size of inverter depending on what DNO allow for export?

Or still go max panels on roof as possible and inverter to match DNO limit or max inverter size as you can afford?

What are your thoughts on this?

 

[tamzzy]

Should you limit the amount of panels and size of inverter depending on what DNO allow for export?

Or still go max panels on roof as possible and inverter to match DNO limit or max inverter size as you can afford?

What are your thoughts on this?

max everything, with this way you can keep exporting at max rate for longer
what has your DNO limited you to?

 

[Journey]

Should you limit the amount of panels and size of inverter depending on what DNO allow for export?

Or still go max panels on roof as possible and inverter to match DNO limit or max inverter size as you can afford?

What are your thoughts on this?

Never limit your panels as export could change at any time.

 

[Ron-ski]

Or still go max panels on roof as possible and inverter to match DNO limit or max inverter size as you can afford?

Max everything, that way your system can cover high house loads when needed, and you can charge the batteries in the off peak period in the winter. In the summer you can export all day long, rather than just supplying house loads and recharging the batteries, you'd always export and gradually charge the batteries, that way you'd still export quite a bit.

Also, if you are hitting limits, you can use excess to charge cars, heat water etc.

 

[lmfy2k]

max everything, with this way you can keep exporting at max rate for longer
what has your DNO limited you to?

thanks, nothing back yet, was just a hypothetical question

Never limit your panels as export could change at any time.

Thanks!

Max everything, that way your system can cover high house loads when needed, and you can charge the batteries in the off peak period in the winter. In the summer you can export all day long, rather than just supplying house loads and recharging the batteries, you'd always export and gradually charge the batteries, that way you'd still export quite a bit.

Also, if you are hitting limits, you can use excess to charge cars, heat water etc.

Thanks, yeh, this is the way!

 

[Ron-ski]

Here's a video about doing what a lot of people say you can't, and I've been saying yes you can for what seems like years now. That is upgrade a FITS system.