The right inverter for battery storage and some other Qs

[Oldgreybeard]

Be aware that some hybrid inverters have lower battery charge and discharge rates than AC coupled inverters, It's buried in the details of the specifications so is worth checking. For example, the GiveEnergy Giv-HY3.6 hybrid inverter accepts up to 4.5kW DC input from the panels, will deliver up to 3.6kW AC from the solar panels, charges the batteries at a maximum of 3kW and will deliver 2.5kW from the batteries to the house. The story is similar for the larger GiV-HY5.0. That will take up to 6.5kW DC from the solar panels, deliver up to 5kW AC from the solar panels, charges the batteries at a maximum of 3kW and discharges at a maximum of 2.5kW.

The battery charge and discharge power capability of hybrid inverters is almost always a lot lower than their nominal rating, and this may make a difference to your choice. I would not want to be limited to just 2.5kW from the battery, TBH, and have been tempted to swap our 3kW AC coupled inverter for a slightly larger one. Just going to 3.6kW would make a useful difference for us.

[ducabi]

So how do I read the spec below for hyd3600? Input from solars 4.8kWh, output from solars to house (or back to grid?) 3.6kWh?
What about batteries?
https://www.sofarsolar.com/ueditor/net/ ... 20data.jpg

I'm thinking how often during the day I may need to use over 2.5kWh, on the other hand even if it's 1hr a day it may add up to £150-250 a year, which is enough to cover a better inverter. Am i correct?

[Oldgreybeard]

So how do I read the spec below for hyd3600? Input from solars 4.8kWh, output from solars to house (or back to grid?) 3.6kWh?
What about batteries?
https://www.sofarsolar.com/ueditor/net/ ... 20data.jpg

I'm thinking how often during the day I may need to use over 2.5kWh, on the other hand even if it's 1hr a day it may add up to £150-250 a year, which is enough to cover a better inverter. Am i correct?

The HYD3600 is 4.79kW max DC input from the solar panels, 3.68kW AC output from the solar panels, max 3kW output from the batteries, max charging power to the batteries 3kW.

The limits are mostly on the larger models, so the HYD6000 will accept up to 7.98kW DC from the solar panels, will deliver up to 6kW AC from the solar panels, but has the same charge and discharge limits to and from the batteries as the HYD3600, of 3kW maximum charge or discharge.

[ducabi]

The HYD3600 is 4.79kW max DC input from the solar panels, 3.68kW AC output from the solar panels, max 3kW output from the batteries, max charging power to the batteries 3kW.

Thank you! Really appreciate your help.

Does 4.79kW max input from solars mean that when my solars produce that amount of energy I'm able to reuse it by splitting 3.68 +1.11 between current usage, battery and feeding into grid. Or is there some significant loss?

[nowty]

The HYD3600 is 4.79kW max DC input from the solar panels, 3.68kW AC output from the solar panels, max 3kW output from the batteries, max charging power to the batteries 3kW.

Thank you! Really appreciate your help.

Does 4.79kW max input from solars mean that when my solars produce that amount of energy I'm able to reuse it by splitting 3.68 +1.11 between current usage, battery and feeding into grid. Or is there some significant loss?

If you have enough solar PV, 4.79kW is the maximum that can be absorbed by the inverter and yes, it will be split and there will be a circa 10% loss.

[marshman]

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[ducabi]

The larger Solis Hybrid inverters, RHI 5k-48ES-5G and RHI 6K-48ES-5G - 5 & 6kW respectively both charge and discharge the battery at 5kW. (the actual power is 100A x battery voltage so when fully charged you actually get around 5.25kW. The 6kW one which I have is 6kW from the solar and can "accept" up to 8kW of PV on 2 strings. Will also provide 5kW "back up power" which switches in 20ms after grid failure. G100 (export limitation) compliant and listed on the ENA type approval register.

Datasheet here:

https://www.ginlong.com/rhi_inverter01/33228.html

Sounds good and only £200 more than HYD3600 (assuming it's deliverable),
What sort of approvals do I need to install it? Not sure if lack of PVs at the moment change anything (just inverter and batteries).

[ducabi]

Still not very familiar with the process.
If I'm about to install EV charging point + hybrid inverter without PVs + 3 US3000C batteries, am I right that I should submit G99?
How long does it take to get approval?

[nowty]

Still not very familiar with the process.
If I'm about to install EV charging point + hybrid inverter without PVs + 3 US3000C batteries, am I right that I should submit G99?
How long does it take to get approval?

Only G99 if hybrid inverter is over 3.68Kw, otherwise its a post install G98 notification.

[ducabi]

Only G99 if hybrid inverter is over 3.68Kw, otherwise its a post install G98 notification.

Even if it's both inverter and EV charging point at the same time?